Chaste Tree Vitex agnus-castus is one of only a handful of winter-hardy trees that blooms with true-blue flower spikes all summer long. The Vitex will attract butterflies, Hummingbirds, and bees to its sweet blue to purple flowers. Similar in looks to Butterfly Bush (Buddleia). It is known to be a hardy woody plant which resists cold, drought, and advances from deer. The long, cone-shaped blooms of the Vitex will add color and texture to your garden. Chaste tree and can be used in a variety of different ways. Its upright growth can be pruned to approximate either a large shrub or small tree to fit your needs. Does well in a container and is bonsai suitable. Zones 6-10. Parts of the plant is often harvested for it's many medicinal purposes.