Depending on the height of the allium, tall alliums look great at the back of a border and small varieties are well-suited for containers. Planting Allium Bulbs: How Deep Should They Be Planted? If water pools in the area where you are planting allium bulbs, it will most likely lead to the bulbs rotting. Go back. It’s fun and easy! So once you feel fall’s first chill in the air, it’s time to get planting. Water-in your allium bulbs lightly. The standard method for calculating the ideal depth is to dig a hole three times as deep as the bulb is high, and place the bulb at the bottom with its pointy end up. span a broad range of garden favorites from ornamental bulbs to kitchen-garden essentials most cooks can't be without. I tend to plant in good drifts, rather than in twos and threes to avoid a … Depending on the size of the bulb, plant 10-15cm deep and 10-15cm apart. An even greater effect can be achieved by growing a row of 10 taller alliums such as Purple Sensation behind a row of 10 slightly smaller ones like Azureum. Allium: Perennial Bulbs and Plants Planting Bulbs in Fall: ... or in areas with a high water table, plant slightly more shallowly. Genus Allium are bulbous herbaceous perennials with a strong onion or garlic scent, linear, strap-shaped or cylindrical basal leaves and star-shaped or bell-shaped flowers in an umbel on a leafless stem In containers. Allium varieties grown from a bare root are typically planted in spring. Where to plant allium bulbs. Place pieces of broken pots or stones at the bottom of the pot to assist with free drainage and air circulation. P.S. (So if you have a two-inch bulb, you would plant it four to six inches deep.) You might know the allium family from the chives in your herb garden: little fluffy purple balls much beloved by bees and butterflies. Allium giganteum are some of the largest allium bulbs; plant them 6-8″ deep. Allium hollandicum ‘Purple Sensation’ bears large, rounded heads of deep violet, star-shaped flowers, on tall sturdy stems. How to Plant your Allium Bulbs: In most cases, you will want to fertilize your allium bulb planting site with bulb food to ensure that the bulbs are properly established. Bulb Size: 20/+cm. How to plant alliums. The small and middle sized alliums (A. cowanii, 'Hair', ' Purple Sensation ', sphaerocephalon, atropurpureum and Nectaroscordum) can be planted en masse. Favorite Alliums . Plant the allium bulbs about 4-8” deep and 6-8” apart, placing them in the soil with their pointy ends up. Allium sphaerocephalon needs to be planted and left to get on with it. They are, however, not the only allium in town. I tend to plant in good drifts, rather than in twos and threes to avoid a dotty look. How to plant . Usually, the leaves have to be bruised to smell the garlic or onion scent by humans. Roots form at the base and the growth comes from the pointed end of the bulb. Plant in spring. Bloom time is not the only characteristic to consider when planting your allium planting. An even greater effect can be achieved by growing a row of 10 taller alliums such as, behind a row of 10 slightly smaller ones like. Dig holes about 3″ deep and 6-8″ apart. Growing alliums in the flower bed may deter aphids, which often like to suck on tender new growth of other spring blooms. Allium loves high sun exposure. Plant Allium sphaerocephalon to a depth of three inches aiming to form a ribbon of colour. Place at the back of a border and plant with perennials, leaving plenty of room for these large bulbs to grow. … Pick a spot in your garden that has well-draining soil and gets full sun. Plant the bulbs about 3” deep and 6”- 8” apart: group them in threes or fives or scatter in drifts for a natural look. Plant: Depending on the bulb, follow the recommendation on the label for planting depth. Leave it until it’s completely withered and yellow, then remove. Alliums are generally plants of sunny and well-drained soils. Plant allium bulbs in autumn, at least four times the depth of the size of bulb. Plant allium bulbs in autumn, at least four times the depth of the size of bulb. Place at the back of a border and plant with perennials, leaving plenty of room for these large bulbs to grow. Plant dormant allium bulbs in the fall according to your growing zone. If you are unsure of the planting depth Holland Bulb Farms lists the planting depth on all of the allium bulb packages they sell. Plant smaller growing alliums 7.5-10cm (3-4in) apart, and taller species need at least 20cm (8in) between the bulbs. Allium loves high sun exposure. Award-winner Allium 'Ambassador' is one of the tallest and most architectural onions with its large globe-shaped inflorescence, 8 in. They are found growing predominantly throughout the cooler regions of the Western Hemisphere. She can provide you with the knowledge and tools needed to succeed with your next project! Plant allium bulbs once the trees start losing their leaves. For larger or giant varieties, dig planting holes approximately 8 inches deep and space each hole approximately 8 to 12 inches apart. Alliums aren't too picky: In most cases, alliums grow in average garden soil and need full sun and good drainage. Soil must be light and drain well, and even poor soil is fine. One of the nice features of allium bulbs is the range of hardiness zones where they will grow. If you’re looking to run a fundraiser in the fall, spring or during the holiday season, Flower Power Fundraising is an excellent option! If you live in zones 3 to 9 and have space in your garden for a full-sun plant, then you can successfully grow alliums yourself. The colder your climate, the earlier in autumn you should plant them. In spring, when growth starts to appear, apply a balanced fertiliser to poor soils. It's easy to spot the pointy end of a tulip, and tougher with a crocus. These large alliums are a marvellous feature to have in any garden and are very showy in herbaceous borders. Space smaller varieties of alliums 3-4in (8-10cm) apart, taller alliums need at least 8in (20cm) between the bulbs. The larger varieties (A. Planting the bulbs in groupings of 7-9 bulbs per planting hole will help create a full bouquet appearance. The range of flower sizes and shapes among allium blooms create interest while they are blooming, and even after. A good tip to know how deep to plant it is to multiply the height of the bulb by 3. Alliums could also be planted in large clusters for an eye-catching focal point. Like many other flower bulbs allium bulbs demand that the soil has adequate drainage. Outdoor Beds Find a location where the soil drains well. How to plant alliums. Peonies, Bearded Iris, and Oriental Poppies are late-spring blooming bulbs that combine well with allium flowers. Alliums are standout flowers that provide blooms late in spring. Advertisement. If you plant your bulbs too deep, they may not have enough energy to make it to the soil’s surface. If you plant them too shallow, the blooms may topple over when it reaches its full height. Typically, you should plant the bulb to a depth of four times the diameter of the bulb, allowing a minimum of 4 inches between bulbs. Plant bulbs in early autumn at a depth of about four times the diameter of the bulbs. Average height 80-150 cm. The bulb forming alliums will need to be planted in the fall. Knowing when to plant allium bulbs will help you know when to buy allium bulbs. Giant Allium (Allium giganteum) is a garden showstopper, producing large, 6-8-inch flower heads with a multitude of star-shaped lilac-colored blooms, on sturdy stalks of 4-5 feet. Moly Allium, Drumstick Allium, and Azure Allium bulbs are small – only 5/7 cm and should be planted 2-3″ deep. If you have grown allium in the past this guide will help expand your knowledge on growing conditions as well as the different allium varieties available. Plant them at a depth of 2-3 times their diameter (4-6”) in a well-drained sunny or partly-shaded site. It works well when planted in drifts with ornamental grasses and other alliums, including lighter flowered ‘Beau Regard’. When it comes to planting bulbs in containers, the mantra is exactly the same: drainage-drainage-drainage. If it is 2 inches (5 cm) tall, plant 6 inches (15 cm) deep. Planting Depth: 8 Bulbs per Square Foot: 3 Plant behind or among low growing perennials or annuals for a distinctive touch in any garden. Although alliums are grown largely for their use as a food crop, there are many varieties of allium which are grown purely for their ornamental attributes. If you wish to plant allium bulbs in a pot make sure it has adequate drainage. They don’t require much for growth and long-lasting blooms. Using a spade, gently dig a six-inch margin around the plant, going down about nine inches. Poorly drained soil is a common reason for allium failure. When growing allium bulbs they do have one requirement that is absolutely necessary for success. For best results, we recommend planting your allium bulbs just over twice as deep as the height of the bulb and about 5 or 6 inches apart. We have mentioned growing allium bulbs an awful lot in this guide. Space each planting hole 4 to 6 inches apart. DutchGrown LLC, 827 Lincoln Ave. Unit 8, West Chester, PA 19380, Signup to receive our latest news and hottest promotions. There are dozens of varieties in cultivation; here are some of the best: Hardiness Zone: 4-9 Find your zone. Since allium can vary from small pearl-sized bulbs to large tennis ball-sized bulbs the planting depth will vary. How to Plant your Allium Bulbs: In most cases, you will want to fertilize your allium bulb planting site with bulb food to ensure that the bulbs are properly established. 'Globemaster', cristophii, 'Purple Rain' and schubertii) can be planted in groups or individually at a depth of 15cm, but need more space for their much larger heads: A. cristophii and ‘Purpl… Flower Bulbs from our family farm in Holland. Depending on the size of the bulb, plant 10-15cm deep and 10-15cm apart. If you want to add allium fertilizer, bury it deep beneath the soil surface so that there are at least 3 inches between the bottom of the planted bulb and the product. In its dreams, the stodgy onion tosses its lavender head and dances in the garden. Just make sure the pot is deep and fairly large and the compost is kept moist in the growing season. Planting in the ground Plant the bulbs at a depth of roughly 3-4 times the size of the bulb. Giant onion loves high sun exposure. Freeze and thaw cycles occur in climates that have periods of excessive cold and moisture mixed with warm spells. Read our guide to creating an alpine scree garden. A perfect background plant. A good tip to know how deep to plant it is to multiply the height of the bulb by 3. Which side of the bulb should face up? Soil must be light and drain well, and even poor soil is fine. Where to plant allium bulbs. Planting: Plant bulbs in fall for a spring bloom. Allium giganteum is planted in fall more or less 4 to 5 inches (10 to 12 cm) deep in light soil. Planting: Plant bulbs in fall for a spring bloom. Plant the bulbs 6 to 8 inches deep and 8 to 10 inches apart in fertile, well-drained soil. Grow your alliums in very neat rows of about 10 bulbs planted quite closely together (you might want to add some fertilizer to the soil to make sure they still get all the nutrients they need). Dig down nine inches, allowing a six inch margin around each plant. Ambassador Allium Care . Alliums can be grown in alpine screes. Plant smaller growing alliums 7.5-10cm (3-4in) apart, and taller species need at least 20cm (8in) between the bulbs. Older Post Newer Post, © Copyright 2020 DutchGrown. Allium giganteum and Gladiator Allium are tall but also have large flowers. For best results, grow Allium hollandicum ‘Purple Sensation’ in fertile, well-drained soil in full sun. Blooming in late spring to early summer, this Giant Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. The white forms look more handsome in semi-shade. The planting depth should be two to three times the diameter of the bulbs. For gardeners new to growing allium this guide will help answer all your questions. Soil type. In the North this will be in September or October, in the South in October or November. But, which allium varieties have the largest blooms? They make excellent cut flowers for fresh or dried bouquets. Or the vase filled with the dried blooms of Drumstick Allium may be a great conversation starter at a family picnic. Water well once and wait for spring, or, when you live in hardiness zone 3-7, water well and bring the containers indoors, letting them spend the winter in a cool spot like an unheated garage or basement. To help the bulbs settle and grow roots quickly, it’s important to water them well after planting, but after that you won’t have to water them again. All rights reserved. ... 4-6 inches deep. Allium bulbs grow in hardiness zones 3-9. No matter the use in your garden, one thing remains true about allium flowers is they will turn heads! For a fun DIY project with allium blooms try spray painting the dried allium blooms. The sunnier the planting location the taller and larger blooms you will have. Don’t confuse drumstick alliums with drumstick flowers (Scabiosa stellata), also known as starflowers.This plant is a member of the honeysuckle family (Caprifoliaceae) and the flower clusters have a similar shape, but it is otherwise completely different from the drumstick allium. Perennials like Veronica, Salvia, and Butterfly Weed also bloom in late spring to early summer and they also look nice when planted with allium. Outdoor Planting Plant bulbs in the fall. wide (12-15 cm) globe-shaped cluster. Most allium bulbs will do well in deep pots. Other common names allium 'Purple Giant' . In general, the pointed end of the bulb should face the sky. Plant bulbs in early autumn at a depth of about four times the diameter of the bulbs. Since containers often have limited space, you can also experiment with placing the bulbs closer together, but make sure they never touch. Large bulbs such as Globemaster should be planted 5 to 6” deep, while smaller bulbs like drumstick alliums are only planted 3” deep. All alliums are very easy to grow and will grace your garden for years to come. Plant all bulbs of a kind, when grouped together, at the same depth so they will bloom at the same time and attain the same height. Bloom Time: Blooms late spring to early summer. Depending on species and variety, they may grow in U.S. Department of Agriculture plant hardiness zones 3 through 10. Grow your alliums in very neat rows of about 10 bulbs planted quite closely together (you might want to add some fertilizer to the soil to make sure they still get all the nutrients they need). Taller alliums present quite a large surface area, so you must take care to bury the bulbs deep enough to prevent the wind knocking the stems down. Another thing you can do is to upgrade potentially soggy soil by adding organic material such as peat, bark or manure. Allium giganteum are some of the largest allium bulbs; plant them 6-8″ deep. Many varieties of allium have a strong geometric shape. Its flowers … However, they can also be planted in spring, although they may not flower as well in their first year. take care where you plant it. Short allium varieties like Ivory Queen Allium and Drumstick Allium can be mixed into the front of a perennial bed. Plant the allium bulbs with the pointy end facing up. Big, bold, blooms are appealing for people growing allium bulbs. Wait until the soil is 60 degrees Fahrenheit or colder. How to plant alliums in your garden: Wait until the soil is 60 degrees Fahrenheit or colder. Alliums are a large group of plants that include leeks, onions and garlic. When to plant. Give them full sun. So avoid soggy soil at all cost – this means places where you can still see puddles 5-6 hours after a rainstorm. How to Grow Alliums From Seed. Read our guide to creating an alpine scree garden. Giant onion is planted in fall more or less 4 to 5 inches (10 to 12 cm) deep in light soil. Flowering time: May, June, July. For best results, follow plant-specific instructions on the package or on our website. However, not all allium grows from a bulb. Allium flowers in the garden often are show stoppers. Pick a spot in your garden that has well-draining soil and gets full sun. Gardeners in cold climates will want to plant allium bulbs in September, October, or November. If you plant a pale allium find it a warm spot. Add allium bulbs to your garden for a taste of fun, whimsy, and unique out of this world blooms! They do not like to be exposed fully to the elements. Alliums are members of the same family as onions; however they are grown for flowers and not food. Plant them at a depth of 2-3 times their diameter … Soil must be light and drain well, and poor soil is ok. A good way to know how deep to plant it is to multiply the height of the bulb by 3. Other Growing Needs When your allium seeds begin to sprout, thin the plants allowing 4 to 6 inches of space between them. In this video, Fine Gardening editor Steve Aitken demonstrates how to plant alliums. Ornamental alliums don’t have deep roots, but you want to avoid disturbing them too much. Bulbs should be planted 4 to 6 inches deep, tip side facing upwards, and spaced 6 inches apart. Lift the clump of soil out and gently tease out up to half of the bulbs. Plant them in September or October about 8-10 deep. Alliums will grow perfectly well in a well-drained soil. Therefore, planting ornamental onions among your vulnerable flowers and bulbs can help to deter critters in the garden. The purple ball-shaped blooms of Allium giganteum are the most recognizable allium. Feeding Alliums . Pick your location. Even crowded gardens can accommodate a few alliums because they don't take up much space. Plant dormant allium bulbs in the fall according to your growing zone. People in warm climates should plant allium bulbs in November, December, or early January. A Very Dark Purple Allium. Allium is remarkably resilient in a dormant state and can wait to be planted, but needs to be in the ground a few weeks before the ground freezes in order to put down roots. The small and middle sized alliums (A. cowanii, 'Hair', 'Purple Sensation', sphaerocephalon, atropurpureum and Nectaroscordum) can be planted en masse. This type of allium is usually sold as a potted plant, and may be more available in spring than fall. Get a pot or box with at least some drainage holes at the bottom. Plant the bulbs in a multi-purpose compost and water thoroughly. I tend to plant in good drifts, rather than in twos and threes to avoid a dotty look. Therefore, you may hear allium flowers referred to as ornamental onions. Allium bulbs are true bulbs. If you need any help with gardening or if you have plant-related questions or concerns, feel free to reach out to Jenny San Filippo. Set the bulb in the hole pointy side up or the roots down. Alliums will need to be planted deep enough that they won’t be affected by temperature variations above ground, either too warm or too cold. Allium bulbs that are planted in fall most often bloom in late spring. Keeping this in consideration, do alliums come back every year? Now the bulb will be going dormant, and won’t need any watering until next spring. Flower bulbs are tough cookies that are easy to grow, but one thing they hate is getting their feet wet: a bulb that is ‘bathing’ in water will rot in no time. Plant allium bulbs in an area that receives full sun to part sun. Planting Giant Alliums: Choose a spot with full sun and good soil drainage. For bulbs such as tulips and daffodils, a warm and sunny location with good drainage is best. The ideal time for planting all alliums is September. Choose a spot with where the soil will not get waterlogged as alliums don’t like “getting their feet wet” as this may cause the bulbs to rot. Planting allium in a planter or above-ground container in a climate that has freeze-thaw cycles can be problematic. Alliums are plants of exquisite beauty in both flower and leaf, with tough constitutions. If you like things neat and tidy or want to maximize the wow-factor alliums can bring to your garden or container, you can opt for the super regimented approach. Planting Tips: With alliums, there’s no need to worry about deer, squirrels or voles. The Planting Process. Send me your questions! Perhaps the tallest of the ornamental onions, Allium giganteum is a striking and bold addition to the garden with its star-shaped, tiny lilac-purple flowers forming a 5-6 in. Find a well-draining container and fill it with loose soil, making sure water won’t gather and stay at the bottom. In addition to the globe-shaped blooms, many varieties of allium are tall, growing over 4′ when mature. Pick a spot in your garden that gets full sun. Wait until it’s cold outside, with a soil temperature of 60 degrees Fahrenheit or lower. Follow our garden expert, Jenny, through our garden and learn how you, too, can have beautiful bulbs in bloom! Alliums can be grown in alpine screes. Plant the allium bulb three times its height deep in well-draining soil in a sunny location. Family Alliaceae . Allium atropurpureum is perhaps the darkest purple allium. As a general rule, plant big bulbs about 8" deep and small bulbs about 5" deep. These mid-sized alliums like Star of Persia Allium and Purple Sensation Allium can easily fit into most planting beds. People who want late spring to early summer blooms in their garden should consider planting allium bulbs. Like all flower bulbs, alliums need a cold period to develop their roots and get ready for spring. Allium giganteum is planted in fall more or less 4 to 5 inches (10 to 12 cm) deep in light soil. Growing alliums in the garden deters rodents, the peach borer, and even the destructive Japanese beetle. Plant the bulbs about 3” deep and 6”- 8” apart: group them in threes or fives or scatter in drifts for a natural look. Some ornamental alliums grow more like chives and what you plant is a clump of roots rather than bulbs. Ornamental allium flowers have a slight garlic or onion scent. Apply a bulb-type fertilizer, such as 4-10-6 or 5-10-20, to the planting area. Tall varieties of allium such as Summer Drummer Allium, White Giant Allium, Allium giganteum, and Gladiator Allium are best planted in the back of a planting area. Simply plant your bulbs deeper to start with, with the largest or latest flowering bulbs further down, moving to the smallest and earliest flowering in the top layer. Plant spring-flowering bulbs such as alliums in fall. Star of Persia Allium blooms can grow up to 12″ in diameter. Planting giant onion. Combining them with later-blooming perennials helps hide the foliage that often starts to die back before blooming finishes. Moly Allium, Drumstick Allium, and Azure Allium bulbs are small – only 5/7 cm and should be planted 2-3″ deep. If the soil is moist there’s no need to water them in. Since alliums grow less well when they have to fight for nutrients with their fellow bulbs, it’s best to plant them 6-8” apart. Individual plants can spread about a foot to a foot and a half. Alliums will grow perfectly well in a well-drained soil. Plant the allium bulb three times its height deep in well-draining soil in a sunny location. If there are still water puddles 5-6 hours after a hard rain, scout out... Site your alliums where they will receive full sun. These are bulbs which originate from mainly dry summer climates so an attempt to imitate this will work in their favour. Perhaps the tallest of the ornamental onions, Allium giganteum is a striking and bold addition to the garden with its star-shaped, tiny lilac-purple flowers forming a 5-6 in. If you grow bulbs with children, be sure to include some alliums, as children love the fact that once in bloom these flowers will often tower over them. Remember that the top of the allium is pointed, but if in dount plant the bulb on its side. However, excessive freeze and thawing in the planting area can be detrimental as well. Growing allium is easy. As with any perennial, site selection and preparation is key to the long-term success of the plant. Plant allium bulbs in fall or early winter. It’s better to plant them too deeply than too shallow. Sell a wide assortment of bulbs and earn 50% profit on all of your sales! Many allium varieties only grow 2-3′ tall. Planting Allium Bulbs In Containers Growing alliums in the garden deters rodents, the peach borer, and even the destructive Japanese beetle. Most alliums will do well in deep pots. Growing alliums in the flower bed may deter aphids, which often like to suck on tender new growth of other spring blooms. For best results, we recommend planting your allium bulbs just over twice as deep as the height of the bulb and about 5 or 6 inches apart. Planting . However, animals such as deer, squirrel, chipmunks, and rabbits have stronger senses than humans and do not like the smell of garlic. Are they aliens or flowers? It will die down every winter and reappear in spring and occasionally you may have to plant a few more bulbs. For best results, follow plant-specific instructions on the package or on our website. Blooming for up to 5 weeks in late spring to early summer, this spectacular Allium enjoys one of the longest blooming season. Thus gardeners living in hardiness zone 5 should plant in October, while, at the opposite end of the spectrum, you should wait until December to plant the bulbs if you live in zone 8. Plant bulbs and perennials that bloom in late spring to compliment and contrast the allium in your garden. Allium bulbs planting instructions Rich, well-drained soil Plant your allium bulbs in the autumn in rich, well-draining soil, to double the depth of the bulb. But ornamental alliums are anything but little. During blooming season, you generally don’t have to water your alliums, but you can water them when there hasn’t been any rain for 3-5 days. In spring, when growth starts to appear, apply a balanced fertiliser to poor soils. It’s better to plant them too deeply than too shallow. Plant dormant allium bulbs in the fall according to your growing zone. After alliums have finished blooming, don’t cut the foliage straight away: through photosynthesis the leaves will create nutrients that the bulb will be needing for its next growing season. Spacing The small and middle sized alliums (A. cowanii, 'Hair', 'Purple Sensation', sphaerocephalon, atropurpureum and Nectaroscordum) can be planted en masse. If the soil is moist there’s no need to water them in. With alliums it is a good idea to plant soon after receipt. The bulbs will not have enough protection to survive the fluctuating temperatures, this can lead to the bulbs rotting. If you like unique and whimsical plants you should consider planting allium bulbs. Some varieties of allium grow from roots. Giant Allium’s flowers are long blooming and are excellent to use as cut or dried flowers. Planting in the ground Plant the bulbs at a depth of roughly 3-4 times the size of the bulb. The Allium Globemaster looks absolutely fantastic on its own and will put a smile on anyone’s face. Plant allium bulbs at a depth 2-3 times the height of the bulb. Alliums thrive in sheltered areas that receive full sun. © 2020 Copyright & Powered By Holland Group. Then cross your fingers and wait for spring. It remains ornamental in the garden well into summer. – Get the planting depth right. When your DutchGrown alliums arrive and you can’t plant them immediately, it’s important to store them correctly: unpack them right away and put them in a dry place with plenty of air circulation, where the temperature is between 40 and 70 degrees Fahrenheit. The best time to plant allium bulbs is in the Fall before your zone’s first frost date. Blooming in late spring to early summer, this Giant Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. Plant bulbs in individual holes or dig a trench if all your bulbs can be planted at the same depth. In the North this will be in September or October, in the South in October or November. Giant Allium (Allium giganteum) is a garden showstopper, producing large, 6-8-inch flower heads with a multitude of star-shaped lilac-colored blooms, on sturdy stalks of 4-5 feet. Depending on the size of the bulb, plant 10-15cm deep and 10-15cm apart. Now all you have to do is wait patiently for winter to do its magic underground, and spring to surprise you with the rewards of your work.