Therese spiderwort is a low-growing clumping perennial plant that is derived from native North American plants. Therese has strappy gray-green leaves and bears attractive three-petaled pink flowers about 1.5 inches in diameter that appear 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 nearly three feet in width. In an evaluation of spiderworts conducted at the Chicago Botanic Garden, Therese 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.