Question
I have a 12 x 12 garden that tends to be fairly moist due to its drainage.  Based on that, I want to plant one Joe Pye Weed along with 2 Kopper King Hibiscus plants.  Can you suggest other companion plants for moist soil in full sun?  Thank you.

Answer
Hi Susan,
Thanx for your question.  

Blue flag, Siberian Iris, Yellow Flag, day lily, bee balm, horsetail, canna, lobelia, swamp milkweed, Royal fern, gunnera (not hardy below zone 7), rheum, astilbe, ligularia and some of the oenotheras (sun drops).  I hope this helps.
Tom