New Guinea impatiens have been good sellers for greenhouse producers. However, they are somewhat difficult to grow well. The following are two common problems.
Lack of Blooming:
If New Guinea impatiens will not bloom then the problem is often that they are too crowded. When crowded the lower leaves are covered and do not photosynthesize well and reduces blooms. As the plants fill in, make sure they are adequately spaced.
Cupping of Leaves:
The cupping and wavy leaves appear to be favored by dry soil and cool moist air. These symptoms commonly show up in March and April and usually disappear as weather improves later in spring. A lot of the orange cultivars show this symptom in the early spring.
Information from the University of Maryland Greenhouse TPM/IPM Bi-Weekly Report.
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