- USDA hardiness zones:
- Full sun to part shade
Winter hardy to USDA Zones 7-10 where the tuberous rhizomes may be planted in the garden in fall about 2-3î deep and 4-6î apart in rich, sandy, medium moisture, well-drained soils in full sun to part shade. Cover the bed with mulch which should be removed in late winter. Several planting options exist for the St. Louis area. First, plant tubers in pots in fall for overwintering in frost free but cool areas (e.g., greenhouse, sunporch or cold frame), with pots being set out in early spring. Second, plant tubers in pots in early spring for a later May-June bloom. Finally, tuberous rhizomes can be dug up in fall for storage over winter, but this process does not always work well. Notwithstanding the foregoing, plants are short-lived and may be best grown in the nature of annuals by simply digging up and destroying the rhizomes each spring after flowering and purchasing new rhizomes each autumn.
Size and growth:
- 0.75 to 1.5 feet
- 0.5 to 0.75 feet
Bloom / flowers:
- April - June
- Blue, red or white with black center
Blue, Showy flowers, White, Annual, and Red
south Europe, Mediterranean
Borders and rock gardens. Good cut flower.
No serious insect or disease problems.