RSS501 - Spiderwort - If you watch closely along side the road, in dry areas, you will probably see some of these. They tend to grow only a few flowering plants to each area. These stand fairly tall and spindly-looking, getting nearly 3 feet high. The flowers aren't very large, maybe 3/4 of an inch across. If you look at them closely they are pretty easy to identify as we don't have very many blue flowers that are three petalled.