(Spiderwort) Tradescantia 'Blue Denim' is a long-blooming selection of spiderwort with true blue flowers the color of its namesake. Each 1-2 inch wide, 3-petaled flower only lasts for one day, but the plants have lots of buds, extending the bloom time up to eight weeks. The flowers are self- cleaning, so deadheading is not necessary. The clean grey-green foliage looks great all summer long, unlike many other varieties which need to be cut back by early summer. This variety of Tradescantia has a nice clumping habit that usually does not need to be staked.