ornamental onion

Ornamental Onion plants should be watered regularly and evenly throughout the growing season, from spring to fall. In dry periods, they should be watered deeply to ensure the soil doesn't dry out completely. Aim to provide about 1 inch of water per week, either from rainfall or additional supplemental irrigation. Water the Onions at the base of the plant, using a gentle trickle, and try not to wet the leaves, as this can lead to fungal diseases. In winter, reduce watering to once a month, and cease it altogether once the plant has become dormant in late fall.

Ornamental onion is a sun-loving plant that needs at least 6 hours of full sun per day in order to thrive. For best results, it should be grown in areas that receive full morning sun and protection from the hot afternoon sun. In climates that get intense afternoon heat, afternoon shade will help this plant to thrive. When planted in partial shade, the growth of ornamental onion can become leggy and flower production can be reduced. In areas that experience cold winters, it is best to plant ornamental onion in a sheltered area that receives some winter sun.

For the ornamental onion species Allium cristophii (including hybrids), pruning should be done towards the end of the blooming season (usually in September or October). Pruning should be kept to a minimal, as too much can severely damage the foliage and bulbs. The pruning should be done lightly and gently - removing only the dead bloom stalks and loose foliage. Once the plant has gone dormant, the bulbs should also be dug up and separated, so they do not overcrowd 1 another.