How to Transplant Allium

Botanists have identified about 500 to 1,000 species within the allium or onion genus in both ornamental and edible varieties, according to a March 2003 PBS special. The method for transplanting is very similar for all of them, as they like moist, rich, well-drained soil kept free of weeds. Allium do not like to be transplanted, however, and tend to grow a new root from the bulb after the root is exposed to light, delaying the maturation process. Early spring just after the last frost is the best time to transplant allium. Areas with mild winters or very hot summers may require different planting times, such as late summer or fall.

Difficulty: Moderately Easy

Instructions

Things You'll Need:

• Garden trowel
• Garden shears
• Hoe
• Compost
• Mulch
• Watering can or hose

1. Separate a single young plant from the seedling pot. Take care when handling not to damage the roots. Some varieties may tolerate a gentle trimming of the root and top to help encourage growth.

2. Prepare the soil well with a rich compost and turn it well so it is easy for the roots to establish themselves. Allium should be planted about three to six inches deep, depending on the variety, and about six inches apart.

3. Water the allium after transplanting, keeping the soil fairly moist but not soaking wet so the plants do not rot.

4. Keep weeds out of the allium bed as the onions do not compete well with other plants. Mulching lightly with straw or leaf mulch can help keep weed growth down. Mulch also will keep the soil moist, which helps alliums grow.

5. Consider "hilling" allium plants once they start growing well. "Hilling" involves moving the soil into a little hill around the base of the plants when they have reached about 8 inches high. Some varieties, such as leeks, may produce a richer flavor and more tender plant if this is done.

References

• Organic Gardening: Alliums
• PBS Topic of the Week: Allium
• Plant Buzz: Allium Central