When to Plant Bupleurum Seeds?

In mild areas seeds can be sown directly into the garden in fall. Everywhere else direct seed into the garden 6 weeks before last frost.

How do you grow bupleurum seeds?

Sow seed in a well-draining, prepared garden bed when soil temperatures are at least 60 degrees Fahrenheit (16 C.). Surface sow and cover with a light dusting of soil. Keep moderately moist until germination, usually in 14 days. Thin plants until they are spaced 12 inches apart (30.5 cm).

Is bupleurum cold hardy?

In general, these plants are pretty cold tolerant. ... Though overwintered plants will grow to much larger sizes, the plants grown from winter sowing were still plenty tall enough to use in flower arrangements. Due to their cold tolerance, I usually begin winter sowing bupleurum seeds in late January and into February.