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.
Readers should be aware that if you use one of our affiliate links to make a purchase, we might receive a commission.
How well do alliums transplant?
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.
I can transplant allium when?
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:
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).
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.
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.
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.
Do alliums have multiple blooms?
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.
Can allium bulbs be planted too deeply?
To guarantee that you get to enjoy the blossoms, it’s critical to plant bulbs at the proper depth. If bulbs are buried too deeply, they may not emerge at all or produce only foliage instead of blooms. Although digging the bulbs too deeply is preferable to digging them too shallowly, the bulbs are more likely to be accidently dug up or to be eaten by squirrels if they are.
There are certain exceptions to the general rule of planting bulbs at a depth that is three times their size.
Spring-flowering bulbs
10 cm, or three times their depth, in snowdrops 10-15 cm Iris reticulata 10 cm, or three times their depth, for crocuses 15 cm, or three twice their depth, for daffodils 10 cm, or twice their depth, for hyacinths 20 cm, or three times their depth, for tulips Crown imperials and Fritillaria imperialis: 30 cm, or three times their depth Snake’s head fritillary, Fritillaria meleagris: 10 cm, or five times their depth 30 cm, or three times their depth, for globe alliums Three times their depth, or 15 cm, for Allium sphaerocephalon Camassia: 10 to 15 cm deep, or roughly twice the bulb’s height
Summer-flowering bulbs
15 cm Eucomis 15 cm, or three twice their depth, for lilies 15 cm deep gladioli 10 cm, or three times their depth, is the crocosmia. Dahlias: slightly below the surface of the soil (start them off in a pot under cover) Cannas: make sure the top of the corm is barely visible? Nerines: at the surface of the earth
How many flowers can one allium bulb produce?
- Each allium bulb will develop a single stalk with a single flower that is surrounded by numerous lesser blossoms.
- Each bulb will eventually multiply to create more bulbs and thus more blossom stems.
- The blossoms will also generate more plants from seed if they are let to go to seed.
Therefore, you may potentially produce quite a number more alliums from the single bulb with a single flower!
What kind of plant complements alliums?
Many perennial plants, such as Echinacea (Coneflower), Phlox, Alchemilla mollis (Lady’s Mantle), Achillea (Yarrow), and Iris, complement alliums wonderfully. Another great option is peonies. Here, a white-flowered Peony and a purple-flowered Allium are paired.
When should the leaves of allium be pruned?
Allium requires very little maintenance because it is a perennial bulb plant with simple requirements.
They will produce lovely flowers on the ground or in pots without your assistance.
- As the flower scapes wilt, trim them off, keeping the stem as brief as you can.
- Only remove leaves that have already begun to turn yellow since the bulb is stockpiling nutrients for the upcoming blooming cycle at that point.
- No fertilizer is required.
In order to conceal the wilted leaves and expose only the flower stalk, it is helpful to grow ground-covering perennials around the gigantic onion plants. Allium leaves have a tendency to turn yellow before or after the blooming of the large umbels.
Allium that is grown in containers should be watered frequently since they require more water because they dry out more quickly.