Forming a dense and low45growing tapestry of many45colours the starry rosettes of sempervivum are fascinatingly attractive they come in colours ranging from shades of green to dark reds and bronze in summer they may produce curious thick stems tipped with flowers individual rosettes die after flowering but are soon replaced by tiny new rosettes which grow to fill the gap sempervivum commonly known as houseleeks grow in dry sunny spots and need very little water they are perfect f