This is the sixth article in my May through April Alliums for the Month series of blogs.
If your winters aren’t too harsh, plant shallot bulbs between October and November. Well-mulch them. We attempted to overwinter replanted shallot bulbs, but we experienced significant winter death. Refrigerate bulbs to preserve them for planting again in the early spring. As an alternative, zone 7 residents can start shallots from seed in late January and plant them in the spring.
From September through November, divide and transplant perennial leeks and Egyptian onions. Use the months of August through October to plant perennial leeks made from dried bulbs. It takes perennial leeks 9 to 12 months to reach a healthy growth.
Allium ampeloprasum var. porrum is a type of common leek. There are two primary varieties of leeks: the blue-green, more resilient winter leeks and the faster-growing, less cold-hardy fall variety, which frequently have lighter-green leaves and are not winter-hardy north of Zone 8. Lincoln (50 days to slender bunching leeks, 75 days to mature leeks), King Richard (75 days, fast-growing), and Giant Bulgarian are our favorites in the first group. American Flag hasn’t served us well. Bolt resistance makes Giant Musselburgh (105 days) ideal for overwintering in softer conditions. Tadorna (100 days), Jaune du Poiteau, King Sieg (84 days, a mix between King Richard and the winter-hardy Siegfried, from Fedco), and Bleu de Solaize are our top picks for winter leeks (105 days, very hardy).
Leeks can be picked anytime they appear to be of a suitable size. We prefer to have one bed of 1080 leeks available for harvesting each month, from October through February, to provide enough food for 100 people. We plant three winter-hardy leeks in addition to two beds of fall leeks. Each month, about ten leeks on average.
Leeks should not be speared when being harvested, thus keep in mind how deeply you planted them. 58 cm (23 inches) away from the leeks, insert the tines of a digging fork (spading fork) vertically into the earth. For efficiency, I aim to dig up two at once. Lever back while pressing down on the fork to make the leeks move. Pulling leeks too quickly can result in broken ones. One leek should be removed, the roots cut off, the plant turned over, and the leaves clipped in a V shape so that the younger, inner leaves are longest and the tougher, outer leaves are shorter. After removing any clearly inedible outer layers, place the leek in a bucket. Before transferring the leeks to the cooler, we placed an inch (2.5 cm) of water in the bottom of the bucket to keep them hydrated. You might be able to harvest a few leeks for immediate use by pouring boiling water along the row at the base of the plants if the ground is too deeply frozen for a fork to penetrate the crust. The leaves appear unharmed by this.
How late can allium bulbs be planted?
Yes! Alliums are annual plants that grow again year after year. Due of their extreme cold tolerance, they can endure most zones’ winters.
Alliums planted in the spring will still blossom, yes. Although the blossoms won’t be quite as big, they will return the next year in full force.
Allium may only grow as foliar growth, with no blooms, or not at all, if you plant it too deeply. To ensure the best growth and lessen the possibility of shallow bulbs being dug up by animals, try to put allium 4 inches beneath the soil surface.
The spring is not the time to transplant allium bulbs. Wait until the end of the summer when the foliage begins to turn yellow so that the plant will be in a dormant state and not be concentrating on new growth. It will be difficult to locate the bulbs if you wait until the stems totally wilt.
Who Should Plant Allium
Consider planting allium bulbs if you want your garden to bloom from late spring through early summer. The variety of hardiness zones where allium bulbs will thrive is one of their appealing qualities. Zones 3-9. Allium bulbs can be grown there. Planting allium bulbs is something you should do if you enjoy unusual and whimsical flora.
When to Plant Allium
When you buy allium bulbs will depend on when you plant your allium bulbs. During the fall or early winter, plant allium bulbs. In colder regions, gardeners should plant allium bulbs in September, October, or November. Allium bulbs should be planted in warm climates in November, December, or early January.
Where to Plant Allium
Alliums grow readily. They don’t need much to grow or produce blooms that last for a long time. In a location that receives full light to part sun, plant allium bulbs. You will have taller and larger blooms if the planting area receives more sunlight.
There is one criteria that must be met in order to successfully cultivate allium bulbs. Allium bulbs demand that the soil have enough drainage, just like many other flower bulbs. You risk the allium bulbs decaying if water collects in the location where you are planting them. In moist soil, allium bulbs do not grow well. Allium failure is frequently caused by poorly drained soil. However, prolonged freezing and thawing in the planting area can also be harmful.
In areas with periods of extreme cold and dampness interspersed with warm spells, freeze and thaw cycles take place. To shield allium bulbs and roots from the impacts of freeze and thaw cycles, it is helpful to plant allium at the right planting depth and to cover them with mulch. It might be challenging to grow allium in a planter or other above-ground container in a climate with frequent freeze-thaw cycles. The bulbs won’t have enough protection to withstand the temperature changes, which could cause them to decay.
How to Plant Allium
Plant allium bulbs at a depth that is two to three times their height. The planting depth will vary for allium because the bulbs can range in size from tiny pearl-sized bulbs to enormous tennis ball-sized bulbs.
Some of the biggest allium bulbs are Allium giganteum; bury them 6–8 inches deep. The bulbs for Moly, Drumstick, and Azure Allium are just 5 to 7 cm in size and should be buried two to three centimeters deep. If you’re unsure, Holland Bulb Farms includes the planting depth on every packet of allium bulbs they offer.
The bulb’s which side should be facing up? The bulb’s pointed end should typically face the sky. True bulbs are allium bulbs. The bulb’s pointed end serves as the growth site, and roots develop at the base.
What To Plant With Allium
Fall-planted allium bulbs typically blossom in the latter part of April. To complement and contrast the allium in your garden, choose bulbs and perennials that bloom in late April. Allium blossoms go well with late-spring blooming bulbs like Peonies, Bearded Iris, and Oriental Poppies. When planted with allium, perennials like Veronica, Salvia, and Butterfly Weed also produce blooms in the late spring to early summer.
When planting your alliums, consider other qualities as well as bloom period. Many allium species have distinct geometric shapes. Many allium types are tall, reaching heights of over 4 when fully grown, in addition to having globe-shaped flowers. The back of a planting area is the greatest place to grow tall allium cultivars including Summer Drummer Allium, White Giant Allium, Allium giganteum, and Gladiator Allium.
You can blend short allium varieties like Drumstick Allium and Ivory Queen Allium into the front of a perennial garden. To provide the impression of a complete bouquet, plant the bulbs in groups of 7-9 in each planting hole.
Many allium types only reach a height of 2 to 3 inches. Most planting beds may accommodate these mid-sized alliums, including Purple Sensation Allium and Star of Persia Allium.
Which Allium Have the Largest Blooms?
People who plant allium bulbs are drawn to their large, striking flowers. But which allium species produce the biggest flowers? Star of Persia Allium blossoms have the biggest diameter while not being the tallest of the alliums. The diameter of an allium called Star of Persia bloom can reach twelve.
Gladiator and giganteum allium Allium have big flowers and are tall. These allium flower cultivars have blooms that can reach a diameter of six.
Are Ornamental Onions and Allium the same thing?
The botanical genus Allium includes these spring flowering plants as well as garlic, onions, and chives. As a result, allium blossoms are sometimes called decorative onions. Alliums are relatives of onions, although they are planted for their blossoms rather than for nourishment.
Allium Used to Deter Critters
Allium ornamental flowers have a faint aroma of onion or garlic. It doesn’t smell overpowering. Humans typically need to bruise the leaves in order to detect the odour of garlic or onions. Deer, squirrels, chipmunks, and rabbits, which have more acute senses than people, do not enjoy the smell of garlic. In order to keep pests away from your delicate flowers and bulbs, try planting ornamental onions nearby.
What month should alliums be planted?
Most likely, when you think of alliums, you picture those plants with the traditional round, purple flowerheads on long stalks that make borders look amazing in late spring and early summer. Alliums, however, are much more than this.
There are alliums that are white, pink, blue, and yellow. There are some alliums that resemble a fireworks display, and others that resemble knotted dreadlocks.
You can identify that alliums are related to onions, garlic, and leeks by the aroma released when you crush the foliage. This family also includes chives (Allium schoenoprasum), which have delicious leaves that may be sliced and used to salads and dips.
Alliums are a favorite of butterflies and bees, and even the dried flowerheads look lovely in the border or in floral arrangements.
When to plant allium bulbs
The greatest time to plant alliums is in mid- to late-autumn, at the same time as tulips and daffodils that bloom in the spring. Allium bulbs are resilient and can withstand harsh winter weather if they are planted in soil that drains effectively.
Some attractive alliums, like “Allium sphaerocephalon,” flower in the late summer. Most ornamental alliums bloom in the late spring and early summer.
Where to plant alliums
The majority of alliums thrive in full sun and well-drained soil. Tall alliums should be planted in a protected area to prevent the stems from blowing over in high winds. Plant purple-flowered chives (‘Allium schoenoprasum’), which appreciate afternoon shade, or yellow-flowered ‘Allium moly’ in shaded areas.
Tall alliums look great planted in broad swaths or punctuated across a border. Late-summer bloomer Allium sphaerocephalon has gorgeous wine-red flowers that stand out amid the grasses in prairie planting schemes.
Long, slender leaves on ornamental alliums fade back as the flowers emerge. To conceal the waning foliage, place allium bulbs under other low-growing plants.
Planting allium bulbs
- Remove any weeds by turning the dirt over. Dig in leaf mold or compost instead of using manure on heavy soil as this can change the soil’s pH level. Alliums thrive in soil with a pH that is neutral.
- Make a hole that is roughly four times the bulb’s depth.
- Put a bulb in the opening with the roots pointing down.
- Gently compact the earth after filling the hole.
Alliums can also be grown in large pots with soil that is a mixture of grit, John Innes No. 3 compost, and multipurpose compost.
Tips on caring for alliums
- Ground-planted alliums typically don’t require irrigation.
- In the spring, alliums grown in containers will require regular watering. However, avoid letting the compost become soggy as this could lead to the bulbs rotting.
- Crushed eggshells around plants, copper tape around pots, beer traps, or wildlife-friendly slug pellets can all be used to deter slugs and snails from eating new spring leaves.
- When the plants are in bloom, spread a general-purpose fertilizer to aid in the development of the bulbs, assuring healthy flowers the following year.
- Once the leaves have withered back, remove them.
- There is no need to deadhead the flowerheads unless you choose to because they still look excellent after flowering has completed. As long as they remain in place at the border, they may be ignored.
- Put pots in a greenhouse or up against a wall of a house in the winter to shield them from the cold weather.
Growing allium bulbs from offsets
Offsets, which are little bulbs affixed to the main bulb, are produced by many allium bulbs. These can either be planted directly in the ground or split from the main bulb and placed in tiny pots to grow on. Before they have developed enough to produce flowers, it will take a number of years.
Wait until the allium plants are through flowering before using a garden fork to carefully uproot the plants and inspect the bulbs for offsets. Replant the bulbs after removing any offsets.
Best allium bulbs to plant
Alliums come in a wide variety, from large to little, with flowerheads that are rounded or exotic-looking twisted. Here is a selection of the most well-liked alliums.
- One of the most well-known alliums, Allium ‘Purple Sensation’ has the traditional deep purple spherical flowerheads on long, robust stalks. 1 m (3.5 ft) high.
- Large circular purple flowerheads up to 15 cm (6 in) across on robust stems that are 80 cm (3 ft) tall characterize Allium ‘Globemaster’.
- As its name suggests, Allium giganteum is a true giant with dense, spherical purple flowerheads on stems up to 1.8 meters (6 feet) tall.
What happens if alliums are planted too late?
Alliums planted in September bloomed for two weeks in full bloom in May after emerging in March, giving us the longest overall flowering duration of five weeks. Bulbs planted after that lasted a week less in bloom, but the displays were still impressive and the blossoming time was only postponed by one or two weeks.
What occurs if bulbs are planted too late?
Planting spring flower bulbs at the ideal periods is the best strategy for success. The ideal time to plant bulbs is at least six weeks before the first strong, ground-freezing frost is predicted in your area.
The bulbs need time to take root and become established. On the other hand, early bulb planting can result in fungus or disease issues. Bulbs should be planted, as a general rule, when local average nightly temperatures are between 40 and 50 degrees. When that time comes, the soil’s temperature should be ideal for burying bulbs for the winter. Plant in September or October if you live in a colder northern environment. You might need to plant bulbs in December in warmer climates (or even later).
Don’t wait until spring or the following fall if you forget to plant your bulbs when they should have been. Bulb types differ from seeds. They won’t last in the open for very long. Even if you discover a sack of tulips or daffodils that hasn’t been planted in January or February, plant them nevertheless and take a chance. They should give it a fighting shot in the ground or a cold pot rather than withering away in the garage or a cabinet, whatever the case may be. By design, flower bulbs are survivors. Every year, there are several accounts of bulbs that blossom after being planted in the most unlikely situations.