Plant tuberose bulbs in spring when all danger of frost is past. Place the rhizomes 2 to 4 inches deep and 6 to 8 inches apart, in well-draining soil in a sunny spot. Note: Polyanthus lily likes hot afternoon sun. Keep the soil consistently moist before and during the period of bloom that occurs in late summer.
Enrich poor soil with compost and organic amendments to increase drainage and texture for the best show of tuberose flowers.
When blooms are spent and foliage is yellowed, bulbs must be dug up and stored for winter protection in northern areas. Tuberose plant info varies as to which gardening zones can leave the bulbs in the ground over the winter. All recommend spring planting, but autumn digging and storage is said by some to be necessary in all but zones 9 and 10. Others say tuberose bulbs can be left in the ground as far north as USDA Hardiness Zone 7. Those in Zones 7 and 8 might consider planting Polianthes tuberosa in a sunny, somewhat sheltered micro-climate, such as near a wall or building. Heavy winter mulch helps protect the plant from cold winter temperatures.