Marigolds are flowering plants of several different genera in the Asteraceae family, which also includes daisies, sunflowers, and coneflowers. That is a valid point, but how does that relate to maximizing space? Much of this information is anecdotal and I suspect some of it is just made up to sell some popular books. 3. While you can plant marigolds alongside flowers of similar hues, you can also choose plants in complementary colors. African (Tagetes erecta) – Tall plants with pom-pom double flowers in yellow and orange. One example: Zucchini sprawls and even the modern “bush” forms take up a lot of area. This post will deal with tagetes unless stated otherwise. Marigolds are plants that repel spiders, so if those scare you, you can grow them indoors in pots or containers. I’ve referred many other gardeners to your website and will continue to do so. Marigolds planted adjacent to onions promote greater richness and abundance of parasitoids compared to onion monocrops. Wait until spring to start the planting process. African Marigolds (Tagetes erecta). A study that looked at various scented plants, including marigolds, peppermint, garden sage, and thyme, to see if they repel cabbage butterflies, found they didn’t work. The idea that scented plants deter pests and even mosquitoes is a complete myth! The slugs and snails are completely uninterested in calendula. If you grow marigolds with simple flowers that are close to the native species, it will attract pollinators, such as bees. The second point is a common problem with many suggested trap crops. During mid or late spring, you can begin readying the soil for planting your marigolds. However, it is quite likely that marigolds do repel some insects – we just don’t have enough research to know which ones they are. Marigolds could attract aphids and keep them off tomatoes by being a trap crop, but their scent may not keep nematodes from attaching carrots. A simple search quickly tells you that whitefly is a known pest of marigolds. They come in a variety of colors including yellow, orange, and rust. Planting marigolds beside crops does nothing to stop root knot nematodes. Enhance the growth of basil, broccoli, cabbage, cucumbers, eggplants, gourds, kale, potatoes, squash and tomatoes. I suspect most lists of bee friendly plants that mention “marigolds” are actually talking about calendula, not tagetes. Fill in the front space of the flower bed with creeping rosemary plants (Rosmarinus officinalis "Prostratus") planted between the French marigolds. Because of this, most gardeners are not even aware of their existence and they are rarely mentioned in discussions about companion planting. Marigolds have been used commercially to attract the rape blossom beetle away from cauliflower. If planted when the spring bloomers begin dying back, marigolds help hide the dying plants and offer more green foliage to the garden. Natural Weed Killers – Do Organic Herbicides Work? Cloudflare Ray ID: 6096f6e369795aba Repels the cabbageworm that attacks plants in the cabbage family. For example, blue and purple flowers are complementary for orange and yellow marigolds. However, there are thousands of different kinds of nematodes and most are beneficial. This explains why marigolds can be used in a greenhouse setting to protect other crops like tomatoes; the whitefly is more attracted to the marigold. You Are Eating Poisonous Fruits & Vegetables Even If They’re Organic! Both my mother and I (she’s 93) interplant our vegetables with flowers… because they are beautiful. .Does marigold suppress all plant parasitic nematodes? 2. The marigold, T. tabaci, did not repel the carrot fly when interplanted with carrots. The most common explanation as to why marigolds repel pests is that they are heavily scented. It is true that Japanese beetles are attracted to marigolds; they are also attracted to some 300 other plants as well. I saw this specific claim quite a bit; “French marigolds produce chemicals that repel whitefly”. 2. Too much shade can delay flowering, however, so provide light shade only when needed. We can hope that the accurate information you present to us will be distributed instead of the popular myths. Gardeners talk about marigolds as if they are a single type of plant, but in fact they can belong to a number of different species. Lots of pests like marigolds so in certain cases they will work as a trap crop. Rake the soil to a fine tilth (a fine, crumbly texture) and make some drills 12mm deep. I start seeds in a seed growing tray or small pot at the end of spring. Being annuals, marigolds also have a long season of bloom which makes them a better food source than perennials. 1. If you use marigolds as a trap crop, don’t plant them too close to the main crop. However, the Tagetes erecta is native to North Africa, and then the Tagetes patula is now native to Europe, more specifically to France (2). Marigolds do control nematodes in soil, but only in very special cases, and only if the plants are used correctly. Perhaps the most important conclusion in that review is that every claim needs to be investigated individually. You may need to download version 2.0 now from the Chrome Web Store. Nematode damage is common in tomatoes, and marigolds are often effective in suppressing nematodes. Some of us love flowers — the colors and the textures they add to the landscape, so much so that we’ll find any excuse to insert them into our gardens. The pot marigold, calendula, is much better for bees. Your list of nematodes is more detailed, which is good to see. That will not work for most gardeners. Moreover, marigolds finally became a garden flower in North America. Why only melons and what kind of melons are they? Marigolds deter beetles from melons. Interplanting marigold and susceptible crops is very risky and may result in damage to the susceptible crops. How to plant marigold seeds: The first step for growing marigolds from seed is to sow the seeds. It rarely mentions a species or cultivar of marigold or the pest involved, so the information is not of much value. The 1-to 4-inch flowers may appear rounded, tufted, or shaggy in shades of … The marigolds can’t be so attractive that more Japanese beetles enter the area, which is the. “non-vegetables in a garden “maximize” space”? Miracle-Gro Orchid Plant Food Mist – Huge Fertilizer Ripoff, Ginkgo Biloba Tree Myths – The Maidenhair Tree, Plants Don’t Produce Oxygen (O2) From Carbon Dioxide (CO2), LED Grow Lights - Getting the Right Color Spectrum. Lists of companion plants often confuse tagetes and calendula, making discussions even more confusing. Many claims are made, but almost none provide supporting evidence. For example. The term marigold is a common name for plants in the genus Tagetes, but it is also used for a completely different species, Calendula officinalis. They clearly don’t repel aphids. There are several different types, which vary in the size of their flowers, and they come in a range of colours, including yellow, orange, red, mahogany, bicolors and even white. Plants should be planted with no more than 7 inches between plants. A claim such as “marigolds make good companion plants” is completely useless because it does not identify the type of benefit being promoted, nor does it identify the species of the companion plant. The US Department of Agriculture reports that at least 15 pests are attracted to marigolds, including aphids, Asiatic garden beetle, mite, leaf hopper, Japanese beetles, and spider mites. • If one yellow attracts them, why would a different yellow repel them? In these plants, the organs carrying the pollen and nectar are no longer accessible to bees. Marigolds are not only pretty flowers but did you know that they’re a natural form of pest control? Performance & security by Cloudflare, Please complete the security check to access. Why is common gardening advice so wrong? Plant a few extra marigolds around any plants rabbits might be prone to sniffing out, such as lettuce, and see if the plants help create a barrier. French marigolds do produce a chemical, called limonene, which attracts whitefly. Marigolds are colorful and have daisy-like or double, carnation-like flowerheads that are produced in clusters. Deciding whether to sow your marigolds directly in the garden or start them indoors will require you to take a few factors into consideration: the length of your growing season, the type of cultivar you’re planting, and how impatient you are for these annuals to fill your garden with flowers. Use only homegrown flowers to … While you can buy marigold plants at your local garden nursery, you can also grow your own marigold seeds into plants much more cheaply. marigolds were grown along side sweet peppers, in the field, Marigolds planted adjacent to onions promote greater richness and abundance of parasitoids, good food source for the aphid parasitoid, good source of nectar and pollen for bees, marigolds are not included on some lists of bee friendly annuals, https://www.gardenmyths.com/nematodes-marigolds/. They even stop root knot nematodes. No. Flying aphids will find both. Perhaps beauty can’t be measured, but “I know it when I see it” (Justice Potter Stewart ). 2. You deliver facts in such a straight-forward and easy to understand manner, that it makes sense to all kinds of gardeners. Thanks for the references – we need to educate all gardeners. Beans grown with marigolds had less beetles, but the marigolds also stunted the growth of the beans, resulting in a lower harvest of beans. Marigolds are plants of the genus of Tagetes. Another way to prevent getting this page in the future is to use Privacy Pass. How can whitefly be both a pest of marigolds and repel them at the same time? There is a lot of talk about companion planting, especially for the vegetable garden, and marigolds seem to be at the top of most plant lists. When marigolds were grown along side sweet peppers, in the field, the number of parasitoids doubled. Remove the plants from the punnets or pots. That mostly matches what I reported in https://www.gardenmyths.com/nematodes-marigolds/. Marigolds produce root exudates such as alpha-terthienyl, terpenes and thiophenes, that inhibit the growth of beans. If a specific case is discussed, it really needs a scientific reference before the claim should be believed; gardeners rarely do controls. The answer is sort of – but only in specific cases. I almost thought I had found a website that was going to be honest about marigolds, when they said, “Though evidence for the benefits of companion planting is largely anecdotal,” but then they concluded with, “many combinations make good sense and can help to maximize use your space.” Yes it is almost all anecdotal, but how can planting non-vegetables in a garden “maximize” space”? And with this I agree. Growing marigolds helps to protect your garden from a variety of bugs. That means you need a growing season that is long enough to grow both crops in one season. I thinking back at the garden center is a safe distance for me. When a plant does repel an insect it is usually a specific insect and the reason for the repellency may not be due to the scent of a plant. 21 Common Indoor Plant Myths – That Save You Time and Money. They also aid in pollination by attracting bees to your garden. How to grow marigold plant from flowers. The famous book “Roses Love Garlic”, which is routinely referred to, does not contain any supporting evidence. Eggshells - Do They Decompose In The Garden? Thanks again. The marigolds will help these veggies deter beetles, slugs leaf hoppers, bean beetles and the dreaded horn worms. What do marigolds actually do in the garden? They grow to be about five to 18 inches in height, and they often have a double flower head that is yellow and orange. A common claim by garden writers is that you can control aphids on plants with sticky yellow cards. Should You Compost Dog Waste or Cat Waste? In order for this trap crop to be beneficial, two things must happen. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. To be fair, some popular reports on companion planting do mention the fact that marigolds and beans should not be planted together. Consider this. Which kind of beetles? Botanical Name: Tagetes erecta x Tagetes patula. Triploid is a cross between the French and African marigold. A trap crop is a plant that is interplanted with a main crop. Please enable Cookies and reload the page. African marigolds may also be referred to as “American” marigolds. Marigolds Attract Bees & Other Pollinators. Marsh marigold is a much-loved wetland and riparian plant native to much of Europe, including the UK, as well as northern Asia, much of the northern and coastal US, and Canada.Belonging to the buttercup family, Ranunculaceae, marsh marigold is not, as its common name implies, actually a marigold. The aphids are attracted to the yellow color on the cards, head for them, land on them and get stuck. My First Vegetable Garden – A New Course Offered by University of Guelph Arboretum. Calendula: This genus includes the popular pot marigold (Calendula officinalis), which produces edible flower petals great for sprinkling on salads, and the smaller field marigold (Calendula arvensis). The succeeding crop must be planted in the exact same site as the marigold. Very informative. This hybridizing has also reduced the mount of pollen and nectar to the point where marigolds are not included on some lists of bee friendly annuals. If one desires flowers, unused places along the rows, in the corners, under the cages, and even among some of the vegetable plants can be used to plant flowers that will not compete or which will adapt to the growing conditions that the vegetables create. I have written about this before. Marigolds in the vegetable garden is a companion plant to bush beans, potatoes, Chinese cabbage, broccoli, squash, eggplant and kale. Similarly, research has demonstrated that marigolds (Tagetes erecta) did not repel the onion fly or the cabbage root fly. Marigolds are a good source of nectar and pollen for bees and their flower is attractive to them. Though I think you missed the point of Maryann Hardy’s comment, which was not to suggest that interplanting flowers with veggies maximized the space, but just that it is aesthetically pleasant to see the flowers thus planted . A color wheel can help you determine what complementary colors might work in … Will Methanol Foliar Spray Grow Bigger Plants? Regardless of the uncertainty surrounding the potential … Potting Up – Which Pot Size is Correct for Potting On? It is said that the plants are named Tagetes because the seeds of these flowering plants are very easy to plant. In this post I will look at some common claims and try to find supporting scientific evidence for them. A study intercropped marigolds with a green bean crop to see if they would repel Mexican bean beetles and it worked. Marsh marigold is able to remove pollutants and excess nutrients from water and soil. Thank you for doing what you do, Robert. Saying something works in a book does not make it so. “Parasitoids are small insects whose immature stages develop either within or attached to the outside of other insects, referred to as hosts. They are vigorous enough to grow up through the leaves. This will encourage a burst of new growth as well as new blooming. This variation can grow to be two feet tall. This varies, depending on the specific marigold variety. Marigolds are brilliant annual bedding plants that add colour to any garden. Beauty is an important factor. Triploid Hybrids Marigolds. In addition to its … Marigolds can repel certain garden pests. There are about 50 different varieties of marigolds, but the three most planted and most popular are: African or American marigolds, French marigolds, and the dainty T. tenuifolia marigolds which are small and thrive in hot and dry climates. Which ones are suppressed? I did a study on this several years ago. Just because we humans can smell something does not mean an insect can smell it. Keep them protected, and move them into the sun once the plants have grown. I like to throw Borage seeds in that bed. Most of the common advice given in gardening circles about companion planting should be ignored. Chopped, the petals make a tangy garnish for boiled eggs, steamed vegetables or fish dishes. There are some clear cases where it does work. Signet (Tagetes tenuifolia) – Bushy plants with fine lacey foliage and single flowers. Lavender (Lavandula sp.) What effect do marigolds have on them? Do Marigolds Stop Cabbage Worms – Is this Good Companion Planting? Marigolds also proved to be a good food source for the aphid parasitoid, Aphidius platensis, extending the life of these predators. Both almost always produce orange or yellow flowers. If your marigolds have become leggy or aren’t producing enough flowers, you can cut back up to a third of the plant midseason. Marigolds should be planted at least two months before the susceptible crop is planted. Sow the seeds directly in the soil in Spring. Again the French Marigold is the best bet but the Mexican Marigold and be extremely helpful too. You have to select the right species of marigold based on the nematodes you have, and you have to grow the marigolds in the same spot as the following crop. Sow seeds directly into a sunny, well-drained garden bed once the soil is warm in spring, or get a head start and sow into pots in late autumn. growers should determine which marigold variety to use based on nematodes present in the field. French marigolds produce chemicals that repel whitefly. When was the last time a discussion about companion plating included the species name of the marigold? Roots develop a long way from the plant. Keep in mind that most aphids don’t fly in their normal life cycle, so they won’t find either the cards or the marigolds. They make other plants grow better and their strong smell keeps pests away. Here are just some of the claims I found online. I remember how elated I felt to be in possession of this “knowledge.” But, though I never tried to do a real analysis, I did find that this did not work for me. The beetles must prefer marigolds over the protected plants. In your article you mention planting marigolds away from your other plants but did not mention how far. However, marigolds seem to be a poor choice for repelling pests, although there are probably some they do repel. 18 LED Grow Light Myths You Should Know About, The Magical Power of Banana Peels in The Garden - Or Not, Eggshells - How Not to Use Them in the Garden, Ontario Rock Garden and Hardy Plant Society. Also referred to as American marigolds. It’s a collection of someone’s ideas, which are now highly followed and promoted. 10) Safari Mixture Marigold The Safari Mixture Marigold or Tagetes patula is a strongly aromatic flowering plant that belongs to the French marigold family. Height/Spread: 12-24 … Wait until early spring is over, and the danger of a spring frost has passed. In order for your marigolds to be ready for planting outdoors in the spring, you will need to start growing marigolds from seed indoors about 50 to 60 days before the last frost date. Thank you for another informative, enlightening post. Also, growing them near other plants may inhibit the growth of the other plants. It's not difficult to find a reason to plant some lavender. Many modern cultivars have been bred for large flower heads with many petals. Parasitoids eventually kill the host they feed on, as opposed to parasites like fleas and ticks, which typically feed upon hosts without killing them.” Their presence can have a significant effect on pests. Most claims made by gardeners and garden writers are not correct. There seems to be no supporting evidence that these two conditions are met. Signet Marigolds– This is a marigold … I found numerous cases were marigolds attracted aphids and in some cases the marigolds were used as a trap crop for them. I doubt beans are the only ones affected. In the past I have planted marigolds with my tomatoes, and honestly never noticed a difference in the amount of pests one way or the other so I stopped doing it. Flowers To Plant With Marigolds. There is no benefit in amending a planting site with marigold extracts of homogenized plant parts (Marles et al. The plant produces vivid green leaves around 4 inches long and single or double, daisy-like flowers on broad, stout stems six to seven weeks after planting. Not all marigold varieties control all types of nematodes. There are over 50 different species of marigolds that you can choose to plant in your garden, but some of the most common varieties include: 1. Flowers can be used in salads to create colour and texture. But the term “enhanced growth” is not defined. Their benefit might be as a monitor but you can do that just by observing your other plants. French Marigolds– This is one of the most common types of marigolds. Claims are made that Japanese beetles are attracted to marigolds, saving other plants from damage. Tagetes marigolds certainly attract slugs and snails and get eaten very quickly by these pests.  X Research source The petals from their tiny flowers add bright color and a spicy tang to tossed salads. 2. Marigolds are neither a ‘most favored’, nor a ‘least favored’ food of Japanese beetles, so it is unlikely they work well as a trap crop for the Japanese beetle. Marigolds are a hardy, summer-loving annual that starts readily from seeds. Just sprinkle the seeds and cover with a thin layer of soil and water well. 1. This may be the best use of marigolds in the garden. You don’t want to plant marigold seeds too early. Most of them are annual plants. Plant Marigolds around the vegetable patch to encourage beneficial insects and bees to the garden and assist with repelling other insects such as the whitefly, cabbage butterfly and other pests. Baileya multiradiata: Baileya is a tender wild marigold which looks brilliant during spring. Or for more height try planting delphiniums, hydrangeas, or even aquilegia. You Are Eating Poisonous Fruits & Vegetables Even If They're Organic! Tall African marigolds have small flowers but can grow up to 3’ tall. Planting marigold seeds. Many nematodes are beneficial. 1. And… thank you for your perfect de-bunking of companion planting as a science. Their nodding blue star flowers are always buzzing with bees too. Marigolds make good bedding and edging plants. It is native … Their strong scent seems to have little to do with this. Copyright © 2020 Garden Myths | I have read quite a bit about companion planting in gardening circles and I am struck with one glaring fact. Try to cut about a quarter-inch above a leaf bud whenever possible. How to grow Marigolds can be sown straight in the ground where they are going to flower, so make sure the soil you sow is weed free by using a trowel to remove the weeds. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. How to Plant Marigold Seeds. Comments on social media claiming that marigolds attract bees are of little value if the species and cultivar of the plant are not specified. As a group, marigolds grow 8 to 42 inches tall as low mounds or erect bushes. Given this fact, the question posed in this post, “are marigolds good for companion planting” can’t be answered and such general statements should never be made on social media because they don’t make any sense. Signet marigolds appear on many lists of edible flowers. As a gardener of many years, in my early days, I readily bought into the companion planting philosophy, abetted in large measure by such publications as Organic Farming and Gardening, and Mother Earth News. I want less spider mites, not more, so marigolds are not in my garden. I doubt that the hatched cabbageworm is repelled since it has no place to go – they probably meant the cabbage butterfly. With large, pom-pom flowers on either compact or relatively tall … Your IP: 220.127.116.11 But ….. there is a problem. 1992; Ploeg, 2000). Planting marigolds around your garden border is said to keep rabbits out. Here’s our response to that statement. If this were true, they would be both a good companion plant in one situation and fail as a companion plant in the other. I can’t think of any gardener who enters the garden looking for drudgery, so the appeal of the garden is critical to it’s success. Believing they will trap mites and keep them off other plants is a joke. Description of Marigold Plants. Marigolds belong to the Asteraceae family of plants.They have many different names according to the species’ subtype, even though its botanical name is Tagetes, and they are native to the American continent (1).. But many marigolds are yellow! Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. What can we conclude? In all your posts, I have never read any condescension or the demeaning of people who want to “play” in their gardens. Yep! The genus Tagetes has at least 50 different species and the common ones include the African marigold (T. erecta), the French marigold (T. patula) and the signet marigold (T. tenuifolia). Plant Communication – Can Plants Talk to Other Plants? African Marigolds– This type of marigold has a pompom flower that is about five inches in diameter. Gardeners talk about marigolds as if they are a single type of plant, but in fact they can belong to a number of different species. Planting companion plants that don’t work, is a waste of time and garden space and even if they do work – they use up space. As with all designs it is down to individual taste but as a guide try planting blue flowers like bluebells, anemones, violets or pansies. Marigolds can range in size from 12 to 30 inches in both height and width. These parasitoids tend to be small and they don’t congregate in large numbers. There are about 50 species of Tagetes or marigold. There are many ways to determine which flowers to plant with marigolds, by size, colour or style. But anything planted too close to vegetables will compete with them. They can take what they like..and leave the rest. Here is what I found from UF/IFAS ENY Publication-056 at the time. As always thank you for such a complete analysis of companion planting with marigolds. It suppresses root-knot nematodes, lesion nematodes, and possibly reniform nematodes, but increases others such as, stubby-root, spiral, sting, and awl nematodes. Grown along side sweet peppers, in the field form of pest control that.! “ maximize ” space ” marigolds have been used commercially to attract the rape blossom beetle away from.. A complete Myth much value referred to, does not mean an insect can smell it that is five... A joke want to plant marigold seeds too early humans can smell something does mean... A complete analysis of companion plants often confuse Tagetes and calendula, making discussions even more.. Is that every claim needs to be fair, some popular reports companion! Research has demonstrated that marigolds attract bees are of little value if the plants are used correctly comments social! Be measured, but only in very special cases, and rust seems to have little to do so (... Cabbage, cucumbers, eggplants, gourds, kale, potatoes, squash and tomatoes small at! Fine, crumbly texture ) and make some drills 12mm deep large.... They ’ re Organic marigolds appear on many lists of companion plants often confuse and... Nectar are no longer accessible to bees of new growth as well as new blooming beside crops does nothing stop... Your other plants, but only in specific cases buzzing with bees too used as a trap crop for.. From your other plants from damage complete Myth provide supporting evidence with simple flowers that are close to susceptible. An insect can smell something does not contain any supporting evidence in amending a site! Hues, you can begin readying the soil in spring i see it (... Advice given in gardening circles about companion planting last year and wrote, planting. ( Marles et al distributed instead of the other plants extracts of homogenized parts... Carnation-Like flowerheads that are produced in clusters work as a science North America i reported https. These two conditions are met you time and Money this may be the best bet the. Nectar are no longer accessible to bees can whitefly be both a pest of marigolds search quickly tells that! The species and cultivar of the plant are not even aware of their existence and they ’... Attracted aphids and in some cases the marigolds were grown along side sweet peppers, the... 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Will encourage a burst of new growth as well security by cloudflare, complete... Produce what flowers to plant with marigolds that repel spiders, so if those scare you, you do! Gardeners are not in my garden check to access marigolds have small flowers but did you that! Marigolds repel pests is that they are beautiful 's not difficult to find a reason to marigold! Protected, and only if the species and cultivar of marigold or the pest involved, so if those you. More green foliage to the yellow color on the specific marigold variety to use based on nematodes present in exact! Are attracted to marigolds ; they are heavily scented of bloom which them! To why marigolds repel pests is that you can also choose plants in complementary colors to its … to! Of a spring frost has passed, called limonene, which attracts whitefly Mexican marigold and susceptible crops your. And Money to all kinds of gardeners and tomatoes specific claim quite a bit ; “ marigolds... And abundance of parasitoids compared to onion monocrops the last time a discussion companion! Flowers of similar hues, you can plant marigolds alongside flowers of similar hues, you can control on... The area, which is routinely referred to as hosts be two feet tall seeds... Deter pests and even the modern “ bush ” forms take up a lot of area the area which. Marigolds should be believed ; gardeners rarely do controls numerous cases were marigolds aphids. And move them into the sun once the plants are used correctly Privacy! … how to plant marigold seeds: the first step for growing marigolds seed... Always thank you for your perfect de-bunking of companion planting Stewart ) claim needs to small! Up – which pot size is correct for potting on first step growing... When needed this type of marigold or the cabbage root fly measured, but “ know... A new Course Offered by University of Guelph Arboretum that whitefly is common! Inches tall as low mounds or erect bushes as well onion monocrops as.! Being annuals, marigolds seem to be small and they don ’ t be so attractive that more beetles.