Moisture: Avoid sever water stress. Silhouettes require moderate amounts of
water after they become established. Avoid consistent water stress and wilting
of the plants. Silhouettes, like other types of impatiens, are easily distinguishable
when they need moisture. Maintain them under alternating wet-dry cycles for
best results. Moisture restriction can help control growth under tight spacing, but
avoid constant wilting, especially after flower buds are present.