Spiderwort is another great, low maintenance, native North American perennial.  The flowers on this plant come in blue, pink, purple and white.  The bright flowers have three petals and only open for one day.  Spiderwort blooms in the spring and summer from May to July. The plants have graceful foliage, multiple easily, and are a great companion plant to many flowers.  They will grow from 12 – 24 inches and spread up to 36 inches. They should be divided when they reach 36 inches. The plant does well in full sun as well as part shade. They prefer to be planted in saturated, well-drained soil.  The plant is hardy in zones 4 – 8.