Tuberosa Butterfly Bush Milkweed - Asclepias

Developed from a native North American wildflower, this is an important source of food for Monarch Butterflies. Forms an upright clump of narrow green leaves, bearing showy clusters flowers in mid to late summer that is sure to attract butterflies.

The seed pods that follow are sometimes used in dried arrangements — pick and dry these while still green. Very late to come up in the spring, so mark the spot by planting daffodils or other companion bulbs. 

For best growth plant in well-drained sandy soil. 

Photos and data courtesy of Van Noort Bulb - http://www.vannoortbulb.com