Chaste Tree (Vitex agnus-castus) Bag of seeds to grow Chaste Tree Over 200 seeds The Chaste Tree grows lilaclike flower spikes that appear in summer or late summer. Can grow up to 20 feet high in warmer climates. An excellent patio shrub. Soil Type: Well-drained, humus soils, full sun. Zones: 6 to 9 Germination Range: 50-70% \Stratification Requirement: None required. Planting instructions included