Gardening Questions And Answers
But the biggest problem was the tendency of some varieties to rot away. Coral bells have shallow roots that need moisture, but too much moisture, especially during winter dormancy, induces stem and crown rot diseases. Most varieties are hybrids of three species, Heuchera americana, H. micrantha and H.
Separate the plant clumps, as needed, into smaller plant clumps that have intact foliage and stems. Dig new holes for the divided clumps of coral bells that are the same depth as the individual root balls, but two to three times their width. Place each root ball into a hole and back fill the hole […]
Coral bells are native to arid regions or dry woodland, hybridizer Martha Oliver said, and mulching and clay soil promotes rapid rot. Traditionally they have been used in rock gardens where the plant crowns remain drained and dry. “They grow best in a gritty, sandy soil,” her husband, Charles Oliver, said.
Coral bells often have problems with powdery mildew, which shows up as a white, powdery growth on the leaves, shoots and sometimes on the flowers. Bacterial diseases can develop on coral bells, leading to brown spots on leaves. Psuedomonas appears as reddish-brown spots and may cause leaves to become abnormally shaped.
At just under 1/2 inch long, and black with an obvious snout, black vine weevils (Otiorhynchus sulcatus) are easy to recognize. These flightless insects feed on coral bells, causing holes and jagged margins on the edges of the leaves. Although the damage to foliage is unsightly, it is rarely harmful to the plant.
Coral bells often have problems with powdery mildew, which shows up as a white, powdery growth on the leaves, shoots and sometimes on the flowers. Xanthomonas produces yellow rings, or halos, around small brown spots that appear on the leaves. Botrytis produces larger brown spots. Rust can also occur on coral bells.