Start indoors 8 to 10 weeks before last frost, then transplant out. Direct sow a group of 3 to 4 seeds every 12 to 15”. Germination improves with cold stratification. Easy to grow, requires little maintenance, needs only occasional water. Will grow in rock soil, self sows, may spread. Surface sow, press into soil, do not cover. Soil pH 6.1–7.8. Hardiness zones 3–9. Perennial.
Usual seed life: 3–4 years.
Planting Depth
surface requires light
Soil Temp. Germ.
68˚F stratify
Days to Germ.
21–30Plant Spacing
8–12”Row Spacing
18”Full Sun,
Moist Well Drained Soil