Varieties
Cereus Peruvianus (Peruvian Pear Cactus) / Cereus Repandus (Hedge or Giant Torch Cactus)
Origin
Native to South America
General Care
Light
Direct sun. If possible, stand them outdoors in summer for fresh air and extra sunlight.
Temperature
18 - 30°C (spring-fall). Give a rest at 10°C (winter), but maintain bright light condition.
Humidity
Average. Tolerates dry air.
Water
Every 2-4 weeks. Water plentifully (spring-fall) and allow thoroughly moist (not soggy) potting mix to dry halfway. Water sparingly (winter) and allow barely moist mix to dry almost fully. Always check moisture level before watering. Aerate mix to improve its condition. Avoid water on stems, which can leave unsightly marks.
Fertilizer
Once a month (spring-fall). Use organic tomato-type fertilizer, according to packaging instructions.
Maintenance
Every 1-2 weeks, rotate plant to ensure even growth. Every 1-2 months, briefly spray with compressed air (10-12” away from plant) to remove dust. Inspect plant for pests, when doing so.
Potting and Repotting
Equal parts soil-based potting mix and coarse sand or perlite. Every 2-3 years (spring), before blooming, move plant into a planter 2-4” larger (diameter and depth). Avoid watering for 1 week after repotting. Top dress annually, once maximum convenient planter size reached.
Special Points/Common Problems:
- Soft, brown or blackish marks on stems may suggest rot from bacteria or fungi. Prevent spread: cut away these areas, back to healthy green tissue.
- Dry, brown, corky patches at the base may suggest ageing Spot found elsewhere may suggest damage from handling, poor ventilation, scorching sunlight or sudden temperature changes. Marks are permanent but not indicators of rot.
- May produce scented, trumpet-shaped, blooms that open at night and last for a day.