Thecatchfly is Silene pendula which grows to about 6 in. with clusters of light pink in summer. It should be given a sunny and thinned to 6 in. There are several attractive rockery species which only demand light, well-drained soil (they dislike winter wet). Easily increased by division in spring. Silene acaulis is only I in. tall with stemless, rose pink in early summer. In some gardens it does not bloom freely. The white form is rare. S. alpestris makes low, spreading tufts of narrow, glossy and bears numerous white, fringed flowers in summer. Height about 4 in. There are double and single forms.