Gomphocarpus physocarpus is an African Milkweed loved by monarchs for feeding and reproduction.  Expect 3-4ft of upright growth consisting of pinnate leaves in lush profusion.  Small clusters of white and pink flowers give way to interesting seed capsules whose appearance invites comparisons ranging from alien eggs to male anatomy depending on the ambient giggle factor.   When those crazy seed capsules open seed flies forth on delicate silken strands to populate the garden.

1 gallon Family Jewels Plant $8.99 at Ploughshares

Image By Amatulic [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], from Wikimedia Commons