Annual Milkweed Seeds. Scarlet milkweed is a popular annual milkweed. Common milkweed asclepias syriaca is a native herbaceous perennial whose main virtue is its appeal to butterflies especially the monarch which deposits its eggs on the milkweed when the caterpillars hatch they feed on the leaves of milkweed.
Scarlet milkweed is reported as drought tolerant but will grow more lush with moist conditions. Matures to approximately 2 3 feet tall and prefers full sun to partial shade. Common milkweed plants grow to about 2 to 4 feet in height with a thin vertical growth habit.
Common milkweed asclepias syriaca is a perennial plant that can be found in a wide range of habitats including roadsides fields and gardens.
Seed which must have a moist cold stratification period is started indoors in early spring for shorter summer zones or outside in warmer areas. Common milkweed plants grow to about 2 to 4 feet in height with a thin vertical growth habit. Milkweed perennials asclepias spp bear many small star shaped flowers and produce a milky sap. Common milkweed asclepias syriaca is a native herbaceous perennial whose main virtue is its appeal to butterflies especially the monarch which deposits its eggs on the milkweed when the caterpillars hatch they feed on the leaves of milkweed.