A real Milkweed plant direct from our Butterfly Garden - not in bloom! These hardy devils are about 4 - 6 inches tall. Milkweed Plants grow like crazy and have amazing bright flowers! The bees love them too! It's a perennial and will come back year after year! PLANT CARE: Common milkweed does not need watering except in the driest conditions. Water deeply, giving the plants between one to two inches of water, then wait until the top inch of soil is dry before watering again. Overwatering common milkweed can result in a lethal fungus.