Bilberry Ice spiderwort is a low-growing clumping perennial plant that is derived from native North American plants. It has strappy green leaves and bears attractive three-petaled lavender and white flowers about 1.5 inches in diameter from June until September. Each flower is open at most a single day, and in some cases, for only a morning. It grows to about two feet in height and up to three feet in width. In an evaluation of spiderworts conducted at the 91½ûÂþ, Bilberry Ice was given an excellent rating for its strong growth habit, flower production, and resistance to leaf spotting and its overall suitability for local garden conditions.