Answer: You can improve your clay soil with the addition of organic matter but that might not address the drainage problem. You may need to experiment a bit to find which perennials do the best for you, before going whole hog and making extensive plantings of any one thing. However some which tolerate fairly damp situations would include Japanese Iris, Yellow Flag Iris, Hibiscus moscheutos (rose mallow), Joe Pye Weed, lobelia, monarda, lady's mantle and some of the ornamental grasses. Occasionally you will also find that Black-Eyed Susan, Siberian Iris, daylilies (hemerocallis), astilbe, forget-me-nots and assorted hosta will also thrive in a damp spot. If you cannot get these plants to grow you may want to try raising the planting bed so it drains faster, or install a curtain drain to redirect the excess water. Good luck with your plantings!
Q&A Library Searching Tips