Trichocereus terscheckii
Light: Full sun; acclimate nursery-grown plants gradually to Phoenix sun. Young or recently transplanted specimens benefit from temporary afternoon shade.
Water: Low water once established. Water deeply but infrequently during warm weather, allowing soil to dry thoroughly between waterings. Keep nearly dry in winter and avoid watering when monsoon rain provides adequate moisture.
Soil: Very well-drained sandy or gravelly soil. In compacted or poorly drained locations, plant on a raised mound and avoid water-collecting basins.
Mature size: Typically 20–30 feet tall and 10–20 feet wide; very old specimens can grow taller.
Bloom: Large flowers appear on mature plants in late spring through summer; flowering may take many years to begin.
Evergreen / deciduous: Evergreen succulent with persistent green stems and no conspicuous leaves.
Growth rate: Slow to moderate; generally faster than native saguaro once established.