Chaste/Vitex TreePhoenix's Best Drought Tolerant Purple Flowering Tree Chaste Tree Chaste Tree (Vitex agnus castus) is the premier drought tolerant flowering tree for the Phoenix Valley. This stunning multi trunk tree produces massive spikes of lavender, purple, blue, and white blooms all summer long from May through September making it the most cold hardy and water wise flowering tree available for Arizona landscapes. It grows 35 feet per year and reaches 1520 feet

the extreme heat requires intensive daily irrigation and significantly slows establishment

Hummingbirds and butterflies can't resist the nectar-rich blooms

Cut back any frost-damaged growth in early February and new stems will emerge rapidly as temperatures warm

Yes — it thrives in full sun and handles reflected heat

Winter (Dec–Jan): Stays semi-evergreen and often keeps blooming through Phoenix's mild winters

adding structure to a Mesa courtyard

Narrow Leaf Agave's upright

creating a dramatic sculptural effect that standard Cereus species don't have

Avoid heavy pruning in fall or winter as this removes next spring's blooms

Warm soil drives fast root establishment and the first flush of new column growth

It may have a heavier bloom cycle in spring and fall

Iceberg roses bloom most prolifically with consistent deep irrigation — drought stress causes bloom interruption