Perennial Selection and Care Guide 1
time of year Special notes frequency in cultural uses, years major pests, etc. Aster novae-angliae, Aster novi-belgii Hardy aster Grows best in rich, well drained soil. Pinch back in late spring. Aster yellows and powdery mildew are common problems. North American native. Grows best in deep, fertile soil high in organic matter. Protect from wind. Aubrieta deltoidea Purple rock cress Ground cover. Trim back halfway after flowering. Prefers well drained soil. Long-lived. Trailing habit. Syn....
