Giant Milkweed Poisonous. Care must be taken to avoid incorporation of milkweed into prepared feeds and hay and these feeds should be. Animals will avoid milkweed as long as there is sufficient forage available.
Milkweed is a native perennial herb with milky sap and leaves opposite or whorled simple and entire the flowers are in umbels purple to greenish white. Extracts from the flowers of calotropis procera have shown. Labriform milkweed asclepias labriformis is the most toxic.
The fruit is a follicle with numerous seeds each with a tuft of silky hairs.
Each flower consists of five pointed. The active principles are uscharin calotoxin calactin and calotropin. In savannah we have had them return slowly from the previous two winters but we are always hedging our bets so to speak and rooting cuttings too. Milkweed is a native perennial herb with milky sap and leaves opposite or whorled simple and entire the flowers are in umbels purple to greenish white.