Chicagoland Blues™ Chaste Tree (Vitex x agnus-castus 'Daniel Searle') is a compact variety with cold hardiness down to zone 5 and is sterile, making it a perfect deciduous drought-tolerant shrub for your garden. His long, indigo bottlebrush blooms delight all season long, and this dwarf size is ideal for any small garden. This plant loses his leaves in the winter and is hardy in zones 5-9. Mature height is 5-6 ft, spread 6-8 feet. Use it as a hedge in a sunny spot in the garden with 6-8 hours of sun.