These milkweed seeds need to undergo cold stratification:<\/p>\n
Place the seeds in contact with moist potting soil, and give them a cold period of at least 4 weeks, between -4\u00b0C and +4\u00b0C. Then expose them to heat, at around 20\u00b0C. Germination will then take place within 3 weeks... You can also sow directly in the garden in autumn, for germination the following spring. When you do the final transplanting, leave 40 to 60 cm between plants in the garden.<\/p>\n
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