Aquatic Milkweed Asclepias perennis Height: 18-24 in (46-61 cm). Propagation: By seeds It is in mid to late summer when seeds begin to drop from seedpods. It’s a great time for us, Gardeners, to collect seeds to sow for next year’s perennials or wildflowers. We refer to this as creating your own garden’s seed bank. …
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