Hollow Larkspur (Corydalis cava) Info How to Grow: Keep warm and moist (you can put in compost) at 72 F/22C for at least 6 weeks. Then keep 25-39F/0-5C for 6-8 weeks. Germination will start at 39F/5C. Raise temperatures gradually up to 50F/10C until germination is finished. If the warm or cold period was not long enough, the seeds will stay dormant until the following year, when they will need another warm period (summer) and cold period (winter). Or keep at 72F/22C for 6 weeks, then sow on Winter Solstice (see the Solstice Sowing page). The plant only makes one leaf the first year it is growing. Watch out for damping off (from too much moisture and not enough ventilation) at this stage. This plant likes rich, humus-filled soil and prefers to grow in moist shade. It takes two years from planting to get a good root, and you might have to dig for it. It can take several years to flower. Once it is established, however, it can expand into very large stands; the picture here shows another variety with white and lavender flowers, but this is how they spread out. General growing info Top |
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