Wednesday, May 1, 2013

Allium Sphearocephalon

Allium sphaerocephalon

Allium sphaerocephalon
This green to purple summer-flowering ornamental onion looks great planted in combination with Nepeta 'Six Hills Giant', Centranthus ruber and Rosa 'Gertrude Jekyll' ('Ausbord') AGM. Its oval flowerheads stand about 60cm or more tall - insects love them, and they add movement and interest to borders.

Vital statistics

Common name
Round-headed leek
Height & spread
60 x 90cm (2 x 3 ft).
Bulbous perennial
Fertile, well-drained soil
Full sun
Fully hardy but may be tender when young
Round-headed leek is easy to grow. The bulbs should be planted fairly deeply, in a light well-drained soil in a sunny position. Once established the plants are fairly drought-tolerant. It grows well with most plants, especially roses, carrots, beet and chamomile, but it inhibits the growth of legumes. It should not be planted near alfalfa, as each species affects the other negatively. Plants often divide freely at the base.

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