A: I have some alliums that I would like to relocate to a bed of other alliums that are flourishing outside. Do I have to wait until September to do that, or can I do it now?
A: Alliums are summer-dormant bulbs that blossom late in the spring. These can be moved, and the best time to do it is just as they start to fall dormant after finishing their blooming cycle.
I’d hold off at least until the leaves begin to turn yellow. That indicates that the majority of the bulb’s “recharging” is complete. The foliage’s function is to absorb sunlight and create the plant sugars that the bulb stores to grow and bloom the following year using water and chlorophyll. If you remove the foliage too soon, this recharge will be interrupted.
The drawback of waiting until fall is that you won’t be able to pinpoint the location of the bulbs. The foliage will have withered and become brown at that point. You could therefore mistakenly dig into the bulb and kill it if you don’t label the location.
You can find the bulbs by digging just before the foliage entirely turns brown. Dig up the entire bulb and plant it again right away in the new site at the same depth (preferably, around two and a half times as deep as the bulb’s length). Before transplanting, remove the foliage. No immediate requirement for fertilizer or irrigation.
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Are allium plants portable?
Post-bloom maintenance for alliums is quite simple. Simply continue to water the plants sparingly until they start to shrivel and turn yellow. At this point, you have the option of either dividing the plants or cutting them all the way to the ground.
Divide allium bulbs every three to four years. Simply use a shovel to dig around the plant and lift the bulbs out. You should see a group of bulbs that you may gently separate with your hands. Replant a few in the same location, and immediately transplant the others to different sites.
It’s considerably simpler to take care of allium bulbs that you don’t wish to divide. When the foliage starts to fade, simply trim it back, and in the fall, mulch the soil with 2 to 3 inches (5-7.5 cm) of material. In the spring, remove the mulch to allow room for fresh growth.
When may I transport UK allium bulbs?
Taller people can need assistance when exposed. After the flowers have faded, let the plant with them until they disintegrate because they make for wonderful winter interest. Some gardeners collect the seedheads and dry them so they can be used as home decor.
Allium bulbs can stay in the garden for multiple seasons. When planting new plants, try to keep in mind where you already put bulbs to prevent damaging those areas.
How to propagate alliums
In a few years, allium bulbs will grow in number. You may occasionally see the white bulbs being pushed out of the ground. Carefully pull the bulbs and gently peel out the offsets in late autumn or very early spring to replant them directly into the ground.
Allium can be grown from seed by leaving the flowerheads on the plant and harvesting the ripe seed to sow right away. Keep in mind that starting alliums from seed requires patience because it takes years to produce a flowering plant.
Growing alliums: pests and problem solving
A fungus called allium white rot prevents the growth of other alliums and onions. Clear and burn the infected plant material, and stay away from growing alliums in the same spot for at least five years, to prevent recurring infections.
Alliums have a tendency to outgrow their surroundings. Learn how to control the amount of alliums growing in a border in this Gardeners’ World video:
Can bulbs be moved while they are still growing?
Yes, you may wait until the end of the growing season in the fall or the beginning of the spring to move misplaced perennials and bulbs. Why then wait? While they are in bud or even in bloom, many perennials, anything with fibrous roots, and practically any bulb can be moved.
If possible, transplant on an overcast day for the best results to prevent the plant from losing moisture from its leaves to the sun. If the weather can’t wait, transplant in the late afternoon. Down this manner, the plant won’t be stressed out by a day of sun and may start settling in.
The most essential component for creating by shovel is obviously something you already have—water. No matter how carefully you dig, you’ll still cut through some roots because those are what supply the plant with water. The plant won’t be able to get enough water to prevent wilting until they get comfortable in their new location. The answer? Every step of the route is watered.
How are alliums used after they have flowered?
The foliage of the allium often appears at least a month before the flowers do. Some species’ foliage starts to turn yellow and die off before the flowers are fully open. Plant the bulbs with other plants that will obscure the wilting foliage to help mask it. Alliums do well with hosta, astilbe, and perennial geranium.
When your alliums are blooming, you may anticipate seeing a lot of pollinators. Any type of habitat garden will benefit greatly from the inclusion of these bulbs.
Like their relatives in the vegetable garden, alliums hardly ever have insect or disease problems. Rarely do bothersome rats and deer show any interest.
Most alliums are perennial plants. They will typically bloom again if the species you are planting is winter hardy and the bulbs are suitable to the growing environment in your yard.
Caring for Alliums After They Flower
Allium wasted flower heads can be removed or left in situ once flowering is over. The seed heads are viewed as an intriguing decorative element by many gardeners. Depending on your environment, they may persist far into the beginning of the fall.
Large-headed alliums like Schubertii and Globemaster hardly ever produce viable seeds. Purple Sensation and drumstick alliums will reseed if the conditions are favorable. Simply remove the seed heads after the flowers have faded and before the seeds develop to prevent a carpet of tiny volunteers.
There are herbaceous alliums as well as alliums that grow from bulbs, including varieties like Millennium and Summer Beauty. These plants have a big root system and come back every year to blossom.
Alliums that emerge from bulbs require their foliage in order to generate energy for the blossoms of the next year. Therefore, it’s crucial to let these plants die back organically. The leaves may typically be removed with a simple tug once it has turned yellow and dried. Trim off the wasted blooms from herbaceous alliums with hedge shears or scissors once they have stopped blooming. This will maintain the plants’ clean appearance and might promote a second flush of blossoms.
My allium bulbs need to be dug out soon.
Under ideal conditions for growth, enormous allium bulbs will proliferate quickly, which can cause overcrowding and a loss of vigor. Fewer or smaller blooms may suggest that a bunch of established gigantic alliums needs to be divided sooner even though it usually takes several years for the bulbs to grow congested.
Alliums can be moved in the spring. The best time to raise and divide the bulbs is in late summer, when the ground has dried up and the leaves and flower stalks have entirely withered away. When the smaller, newly formed bulbs are ready, remove them and plant them in nursery pots or in a different bed.
Alliums can be moved in the spring.
When the foliage has sufficiently faded down, in the summer or fall is the ideal time to transplant spring bulbs. Flowering spring bulbs use their foliage to store energy for the blooms of the following year. Therefore, before attempting to relocate the bulbs, the plants must be allowed to organically die back to the ground.
Wait until the end of the fall, again until the leaf has died back, if you need to move summer flowering plants like canna or dahlia. These can be moved to a new position in warmer climates, but in cooler areas, now is the time to dig them up and store them for the upcoming planting season.
Are allium bulbs safe to dig up and store?
Because of the wilting and discoloration of the leaf, we do not advise planting alliums as stand-alone border plants. The ideal allium companions are those that complement the long stems (such as grasses) and hide the low-lying foliage (i.e. hostas, catmint or hardy geraniums).
A blog post from Longfield Gardens offers helpful advice on how to pair alliums with perennials. You may view their manual here.
You can be extremely inventive with your alliums if you choose the ground-covering plants carefully; you could even put the bigger types, like the Globemaster, near the front of the border. The tall stems make it possible to see through to the plants behind the border.
Water, Feed and Care
Alliums don’t need a lot of water, and wet soil can cause the bulbs to rot, but they do need moisture like all other plants.
During the growing season, we give our alliums about half an inch of water per week, and they thrive. However, because our border is raised and exposed to direct sunlight, the soil dries out very rapidly. In many gardens, alliums may survive on rainfall alone because they are typically drought-tolerant.
In order to avoid the pot becoming waterlogged, alliums in pots should be watered more often.
Alliums don’t require fertilizer throughout the growth season; all they typically require is a mulch of well-rotted dung or compost once a year.
If your soil is extremely deficient, applying a dose of potash or a bulb feed like this in the spring will help, just as it would with any spring bulb.
Deadheading alliums is optional but won’t hurt them. The dead blossoms are frequently left in the garden because they offer interest.
To help the bulbs retain nutrients for the following growing cycle, it would be ideal if you waited until the foliage has completely withered before cutting it back.
When to Dig Up Allium Bulbs
It is not necessary to lift and store allium bulbs every year. The bulbs actually dislike both being disturbed and being kept in storage for extended periods of time.
The performance of the plant won’t be harmed if the bulbs are left in the soil for several years.
Every four to five years, you should dig up the bulbs to remove any rotting or sick ones and separate any large ones into separate bulbs. Instead of being stored, the bulbs should ideally be planted again right away.
Pests and Diseases
Sadly, alliums have a mild onion taste and odor, so these garden pests typically avoid them. Squirrels, foxes, and other hungry animals frequently dig up beautiful bulbs.
(Check out our advice to keeping garden foxes away if you are having a problem with them in your garden.)
Allium leaf miner is a widespread pest that is typically impossible to control, therefore as soon as the issue is discovered, the crop should be lifted and burned. Leaf rust is also typical, however it can be cured, or the leaves can be cut off. However, the majority of bacterial infections can be treated by removing leaves at an early stage. Fungicides can also be used to treat infected plants.
Which Alliums are the Best to Grow?
Although we adore the traditional Purple Sensation, the enormous Globemaster definitely draws attention.
The distinctive drumstick alliums give the assortment some early summer intrigue.
how do you dry alliums?
Pick off seedheads that are starting to fade and store them for a few months in a cold, dry place, such a shed or cellar. To use as Christmas decorations, I like to dry my seedheads and then spray-paint them silver.
are alliums edible?
Since they are all members of the allium family, onions, leeks, and garlic are often consumed foods. Alliums are theoretically edible, but beware eating any that are designed to be aesthetic garden plants because they may have been chemically treated.
are alliums good for bees?
In the spring, bees and other pollinators are all over our alliums. Our neighborhood beekeeper also claims that the honey doesn’t taste oniony.
do alliums need staking?
Even the tallest alliums won’t need staking since their sturdy stems can hold them if they are planted deeply enough in full sun (so they don’t extend toward the light) and in a sheltered location (so they don’t blow over in the wind).
Alliums: Should you deadhead them?
Alliums are drought-tolerant, thus it’s typically not essential to water plants that are rooted in the ground. Summer irrigation is not preferred by plants since it could lead to bulb rot. Alliums planted in containers will require routine watering, but watch out for soggy compost.
Overwintering
Winter cold can be more damaging to plants in pots. to ensure their winter survival
- Place containers in a protected area.
- Place them in the lee of a wall, within a cold frame, or a greenhouse to provide them with some protection from the winter rain.