Zantedeschia spp.
Light: Bright filtered light or gentle morning sun with afternoon shade; protect from intense Phoenix summer sun and reflected heat.
Water: Keep soil consistently moist while actively growing, but not waterlogged. Reduce watering as foliage yellows and allow dormant colored hybrids to rest nearly dry. White calla lily tolerates wetter conditions.
Soil: Rich, organically amended soil that retains moisture but drains well. Use a quality potting mix in containers; avoid compacted, salty soil.
Mature size: Colored hybrids generally reach 1–2 feet tall and 1–2 feet wide; white calla lily can reach 2–3 feet tall and 2–3 feet wide.
Bloom: Typically spring to early summer in Phoenix, depending on species, cultivar, and planting time. Extreme summer heat can halt flowering and trigger dormancy.
Evergreen / deciduous: Colored hybrids are seasonally dormant. White calla lily may remain evergreen under mild, moist conditions but can go dormant with heat, drought, or cold.
Growth rate: Moderate to fast during active growth; slows or stops during extreme heat and dormancy.