How to grow Alliums

Browse our range of Allium Bulbs

Introduction to Alliums:

Allium is the Latin name for the group of plants better known as onions. There are actually over 700 different species of Allium, many of which are fabulously ornamental, but all can be identified by the characteristic onion smell of their bulbs and leaves.

They often make great cut flowers, and many varieties can also be dried for lasting displays. The dried seed heads of many Alliums will also persist in the garden, proving continuous decorative interest into autumn and winter.

They are generally low maintenance and easy to grow from seed although for some of the larger bulbing varieties they might take a long time to mature and flower. Happily, many of the most attractive ornamental types can be bought as bulbs, which only need to be planted and they’re ready to provide spectacular display for years to come.

Even the edible types like chives, leeks, onions and garlic will produce beautiful flowering displays if allowed to grow on and flower. 

Planting & Harvesting

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  • Sow Indoors
  • Sow/Plant Outside
  • Flowers/Harvest

Specification: 

Bulbous perennial and biennial herbs forming clusters or single bulbs, with slender grassy or tubular leaves. Usually flowering from spring to summer, most prefer a sunny position although some are equally at home in light, dappled shade.

How do I plant Alliums? 

Plant bulbs around one and a half times their depth, water them in well.

When & Where to plant Alliums?

Plant bulbs in a sunny position in autumn of early spring. Consider their height, planting tall varieties nearer the back of the border and shorter ones nearer the front. It is a good idea to plant them behind or among other border perennials which can then hide the alliums leaves as they begin to wither after flowering.

How to care for Alliums 

They require little specialist care but apart from regular watering, will benefit from an occasional feed, a sprinkling of Onion and Flower Bulb Fertiliser granules will help bulb development and stem strength as well as improving their natural resistance to disease and drought.

FAQs

Do Alliums need staking?

Taller varieties with large flower heads will benefit from staking as the flowering stems develop, especially in exposed windy locations.

Can I overwinter Alliums?

Alliums do not need any special care to overwinter successfully although if grown in moveable planters or other containers it is good practise to place them in a sheltered position out of the worst of the cold wind and rain over the winter months.

Do allium bulbs spread?

Many allium varieties will produce off-sets, new bulbs and slowly increase their numbers if growing happily in a suitable location. These can easily be divided and replanted to increase their numbers.

Are allium bulbs perennial?

Yes, alliums are perennials and with a little bit of care will give many years of beautiful displays.

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