Alliums thrive in a sheltered, sunny, open, well-drained site. They do not like cold, exposed or waterlogged conditions ornament
Alliums, also known as ornamental onions, are grown for their showy flower heads, which come in wide range of sizes and shades of blue, purple, white and yellow. Even when the plants die back, the dried flower heads look attractive in the garden, or can be cut for indoor display. Alliums thrive in a sheltered, sunny, open, well-drained site. They do not like cold, exposed or waterlogged conditions. Also avoid planting in freshly manured soils. A number of smaller growing species do well in cooler, moister conditions. Ornamental alliums suffer from the same pest and diseases as culinary onions such as onion white rot, downy mildew and onion fly, but they tend to be trouble free in the border. However, it is best to avoid planting where onion crops have been grown. Poor flowering is usually due to growing conditions. Shallow planting, growing on very light or wet soils is likely to result in decline of the vigour. Plant alliums in full sun and make sure that the foliage is not shaded by other plants.
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