Here is a design you can plant.

1. Myosotis scorpioides, forget-me-not
2. Astilbe Peach Blossom
3. Vinca minor-underplanting azaleas
4. Lobelia cardinalis, cardinal-flower
5. Hernerocallis Hyperion (day-lily)
6. Aruncus sylvester, goats-beard
7. Caladium, bicolor hybrids
8. Iris kaempferi, Japanese iris
9. Typha latifolia, cat-tail
10. Iris pseudacorus, yellow flag
11. Caltha palustris, marsh-marigold
12. Hosta plantaginea, fragrant plantain-lily
13. Trollius europaeus, globe flower
14. Lamium album, white dead-nettle
15. Acorus calamus, sweet flag
16. Colocasia, elephant's ear
17. Iris versicolor, blue flag
18. Peltandra virginica, arrow arum
19. Sagittaria montevidensis, arrow. head
20. Typha angustifolia, cat-tail