OmniGrow

Silkweed

SpeciesAsclepias syriaca

Also called common milkweed, butterfly flower, silky swallow-wort, Virginia silkweed

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Silkweed
Photo: Amos Oliver Doyle · CC BY-SA 4.0 · Wikimedia Commons

Fact sheet

every fact quoted from its source
TypePerennial

from Asclepias · “Perennial in Zones 4–9.” — Pleurisy Root - Asclepias Seed | Johnny's Selected Seeds

Days to germination14–21 days

from Asclepias · “14-21 days at 65-70°F (18-21°C)” — Growing Butterfly Weed (Asclepias) | Johnny's Selected Seeds

Days to maturity91–98 days

from Asclepias · “91-98 Days to maturity.” — How to grow Asclepias — planting guide · GardenDraft

Germination temperature65–70 °F

from Asclepias · “65-70°F (18-21°C)” — Growing Butterfly Weed (Asclepias) | Johnny's Selected Seeds

Watergrowing well in arid soils

from Asclepias · “Grows well in arid soils.” — Pleurisy Root - Asclepias Seed | Johnny's Selected Seeds

Hardiness zones4–9

from Asclepias · “Perennial in Zones 4–9.” — Pleurisy Root - Asclepias Seed | Johnny's Selected Seeds

Height12–36 in

from Asclepias · “1–3 ft” — How to grow Asclepias — planting guide · GardenDraft

Start indoors10 weeks before last frost

from Asclepias · “~10 weeks before transplanting” — How to grow Asclepias — planting guide · GardenDraft

Ready when1/2 to 2/3 of flowers are open

from Asclepias · “1/2 to 2/3 of flowers are open” — Growing Butterfly Weed (Asclepias) | Johnny's Selected Seeds

Edible partsRoots

from Asclepias · “Medicinal: Roots are a respiratory expectorant and diaphoretic.” — Pleurisy Root - Asclepias Seed | Johnny's Selected Seeds

Who grows this

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