Esperanza, I don't know what the climate is where you live, but Asclepias purpurascens needs about a month of cold, moist stratification to get good germination. Winter sow your seeds now, if you still expect freezing and near freezing temperatures off and on yet this season. If your remaining winter is mild, you can sow your seeds in a container, enclose it in a sealed plastic bag, and place it it your fridge for a month before moving it outdoors. Plants may not bloom until next year, but they lovely when they do. Once your plants are in the ground, avoid the urge to move them to another location as they develop a deep taproot and resist transplanting.
