Alliums are incredibly long-lived and flower for ages. The ones shown here in my garden at Perch Hill have been coming back year after year for the last twelve years..
Similarly, you may ask, do alliums come back every year?
Alliums aren't too picky: In most cases, alliums grow in average garden soil and need full sun and good drainage. The drainage is critical because so many of the bulbs are huge and will rot with too much moisture. Aside from that, they are easy to grow and come back year after year with almost no maintenance.
Likewise, should I cut down alliums after flowering? Allium post bloom care is very easy. Simply keep the plants moderately watered until they fade to yellow and begin to shrivel. At this point, you can cut the plants down to the ground, leaving them where they are or dividing them. Allium bulbs should be divided every three or four years.
do alliums multiply?
Alliums adore sunlight and will perform best when they can bask in it all day long. Since most of them multiply naturally, they can be left untouched in the same area for years. Some ornamental alliums grow more like chives and what you plant is a clump of roots rather than bulbs.
Do alliums need a lot of water?
Watering. Alliums are drought tolerant and watering of plants grown in the ground is not usually necessary. Plants dislike summer irrigation because this may cause the bulbs to rot. Alliums grown in containers will need regular watering, but make sure the compost does not become waterlogged.
Related Question Answers
Should I deadhead alliums?
It's only necessary to deadhead allium plants if you wish to prevent self-seeding. To keep your garden neat and free of seedlings, pinch a wilted or yellowing bloom away from the stem directly below the head of the flower.Do alliums bloom more than once?
Alliums do not repeat bloom. You can the flower stalks down after flowering in order to send the plant's focus back into storing energy in the bulb. However, the dried flower heads are as attractive as the live flowers and many gardeners like to keep them standing.When to dig up allium bulbs?
Lift and divide the bulbs in late summer after the foliage and flower stalks have completely died back and the ground has dried out. Remove the smaller, newly formed bulbs and plant them in nursery pots or in a different bed until they reach a mature size.Do alliums grow in shade?
Sun or Shade: Alliums grow best in full sun, though most types will also tolerate partial shade. Soil Conditions: Like most other bulbs, alliums need well-drained soil and should not be planted in a soggy area.Do allium bulbs spread?
For accents with larger varieties, space up to 2' apart. While some species spread vigorously through seeds or bulbils, many varieties do not spread at all. Planting: Plant bulbs in fall for a spring bloom. Plant dormant allium bulbs in the fall according to your growing zone.Do alliums self seed?
A happy allium will self-seed freely. If you want to decide where your new plants will appear (rather than leaving it to chance and chaos), you can collect the seeds from the plant before they fall. Most alliums germinate in 12 weeks, but it can take up to a year, so patience is required.Can you take seeds from alliums?
Alliums are spectacular plants, so it's worth saving a few seeds to sow in spring to grow more for the garden. Seeds from cultivars won't be true to type, but it's fun to grow them anyway and see what you get. The seeds will germinate quickly and reach flowering size in a couple of years.Do alliums attract butterflies?
Many Alliums make great cut flowers, too. The Allium family includes edibles like onions, garlic, shallots and leeks, so most species have a scent that will repel deer, rodents and other garden pests. And at the same time, Alliums are attracting bees and butterflies for better garden pollination.Do squirrels eat allium bulbs?
Squirrels are very fond of some bulbs, such as tulips and crocus, but there are other spring-blooming bulbs that they don't like. Good bulbs for deterring squirrels include: Daffodils. Alliums (including onions and garlic)Do allium seeds turn into bulbs?
Because seeds take longer to produce edible bulbs or flowers than do seedlings, starting the seeds indoors before planting outdoors makes sense. In fact for some flowering alliums (A. spp. and cvs) you may need to wait for a full year before seeing flowers if you sow the seeds in the spring.Do rabbits eat alliums?
Of course, rabbits will eat lots of things depending on how hungry they are and what else is available. But there are some plants that they really avoid if at all possible. These Purple Sensation alliums grow well in the part shade of my back yard. Anything in the genus Allium is pretty rabbit-resistant.How do you store allium bulbs over the winter?
Layer the bulbs in the storage medium – don't let them touch each other. Put the containers in a cool, dry place around 50° F. A dry, unheated basement, garage, or crawl space is a great spot as long as temperatures stay above freezing. Check on your bulbs several times throughout the winter.Why are my alliums drooping?
There are, however, some conditions that may lead to droopy flowers. Alliums require a lot of sunlight. If yours don't get enough, they might reach for more light, causing the stems to stretch and weaken. Shallow planting can cause the bulbs to tip, leading to flowers that fall over.What type of soil do alliums like?
Where to Plant Alliums. With the notable exception of Sicilian Honey Garlic (which likes damp soil in shade), the other alliums as members of the onion family love the sun. This is really important for them to flower well. They also like relatively deep rich soil.How deep do you plant crocus bulbs?
Plant crocus corms 3 to 4 inches deep (with the pointy end up). After planting, water well.Are ornamental onions edible?
Ornamental Onion is, of course, edible, but it's not grown for food - and therein lies the fine line between flower and vegetable garden.Do slugs like alliums?
Plants slugs dislike include: The Allium family - such as the Allium giganteum. Strong smelling mint.Do slugs eat allium bulbs?
Slugs: These pests leave large holes in the foliage or eat leaves entirely. They leave a slime trail, feed at night and are mostly a problem in damp weather. 
