These perennials die back in mid- to late summer. Its creeping roots make it a perfect companion to azaleas and rhododendrons. Corydalis flexuosa grows in clumps, and its delicate foliage resembles that of the maidenhair fern. Clumps should be divided in fall or spring. Plants die back in summer.
Rhododendrons are excellent shrubs for a shady garden.
They require an acid soil that's rich in organic matter, filtered shade and constant moisture. The roots grow near the surface, so apply a thick layer of mulch to help prevent them from drying out. After plants bloom, apply an acidic fertilizer formulated for rhododendrons, and pinch off faded blossoms. If you look closely just under the blooms, you'll see a small, striped bit of brown or tan wood. Break faded blooms off at that point.