Start indoors 6–8 weeks before last frost after cold stratifying for 12 weeks, transplant out after last frost the second year. We have had good germination sowing in deep flats the first of April and leaving flats outside to stratify. Pot up June 1st for the first year. Does not seem to self seed and spread as yellow dock does. Divide after three years. See our wiki ‘How to Germinate Your Seeds’ about cold stratifying. Soil pH 5.8-6.8. Hardiness zones 4-9. Perennial.
Days from maturity calculated from the date of seeding. Average 28,300 seeds per ounce. Usual seed life: 2-3 years.
Planting Depth
1/4-1/2”Soil Temp. Germ.
50-70˚F stratify
Days to Germ.
14-21Plant Spacing
12-18”Row Spacing
24-30”Days To Maturity
55Full Sun,
Moist Well Drained