Planting - Plant in a warm sunny location that gets at least 6 hours of sunlight daily in well-draining soil. Good airflow is essential to reduce humidity and prevent rot or fungal issues. If planting into containers, use a pot with a drainage hole and well-draining cactus soil such as Kellogg Palm & Cactus Mix.
Watering - A fast-growing cactus, the San Pedro typically requires more water during the growing season (spring and summer) than other cacti. Reduce watering during the cooler winter months. Allow the soil to dry between waterings.
Fertilizing - San Pedro benefits from fertilizer during its active growing season (spring and summer) using a liquid cactus fertilizer with a lower nitrogen (N) ratio and higher phosphorus (P) and potassium (K) levels.
Pruning - No pruning is required, but branching may occur on the stems if they are damaged or broken.
Winter Hardiness - Protect the San Pedro cactus from frost, as it is especially prone to frost damage, particularly at the tips. Hardy to 15°F but it grows best in temperatures between 30°F and 90°F, thriving in USDA zones 10-11. The San Pedro can also be grown indoors as a houseplant.
Helpful Tips for San Pedro Cactus Care
Signs of Light Stress - Look for yellowing stems or blotchy patches, which indicate heat stress from excessive sun exposure. To avoid sunburn, gradually acclimate your cactus to direct sunlight. Conversely, insufficient light can cause etiolation, resulting in thin tips and distorted stems.
Heat Management - As a high-altitude native cactus, the San Pedro struggles in temperatures above 90°F. In hotter inland climates, providing afternoon shade can help mitigate stress.
