It is a type of Milkweed (plant) according to garden gadenguides http://www.gardenguides.com/plants/plant.asp?symbol=ASTU "The butterfly milkweed (Asclepias tuberosa) is generally described as a Perennial Forb or herb. This Dicot (dicotyledon) is native to the U.S. (United States) and has its most active growth period in the Spring and Summer . The Butterfly Milkweed has Green foliage and conspicuous Orange flowers, with conspicuous Brown fruits or seeds. The greatest bloom is usually observed in the Mid Summer, with fruit and seed production starting in the Summer and continuing until Fall. Leaves are not retained year to year. The Butterfly Milkweed has a Moderate life span relative to most other plant species and a Slow growth rate. At maturity, the typical Butterfly Milkweed will reach up to 2 feet high, with a maximum height at 20 years of 2 feet. "The Butterfly Milkweed is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by Container and Seed. It has a Slow ability to spread through seed production and the seedlings have Low vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -33°F. Butterfly Milkweed has High tolerance to drought and restricted water conditions. "