Buddleja davidii
Light: Full morning sun with afternoon shade in Phoenix; avoid reflected heat from pavement and west-facing walls.
Water: Moderate water in Phoenix; irrigate deeply and allow the upper few inches of soil to dry between waterings. Water more frequently during establishment and extreme summer heat.
Soil: Well-drained soil; tolerates alkaline conditions but struggles in poorly drained clay. Plant slightly elevated if drainage is marginal.
Mature size: Typically 6–10 feet tall and 4–8 feet wide; dwarf cultivars remain about 2–4 feet tall and wide.
Bloom: Late spring through fall, with flowering often reduced during extreme summer heat. Deadheading encourages repeat bloom.
Evergreen / deciduous: Deciduous to semi-evergreen in Phoenix’s mild winters.
Growth rate: Fast with adequate irrigation and suitable exposure.