Dagger cactus (Stenocereus griseus)
Care, watering, light and tips for Dagger cactus on Floravia.
Quick facts
- Family: Cactaceae
- Difficulty: Easy to care for
- Watering: every 14 days
- Light: Full sun
- Temperature: 10–40 °C
About Dagger cactus
Stenocereus griseus, commonly known as the May pitaya, is a branched columnar cactus native to Venezuela and Colombia. Its greenish-gray stems, covered with short spines, can reach considerable heights, creating a sculptural presence in desert gardens or as a striking specimen in large pots. It produces edible red fruits, valued for their sweet and refreshing taste.
Native range
Northern South America (Venezuela and Colombia), Dutch Antilles, and Caribbean islands (Aruba, Bonaire, and Curaçao).
Care tips
It requires full sun for optimal growth and abundant flowering. Watering should be moderate during the growing season (spring-summer), allowing the substrate to dry out completely between waterings, and very scarce or none in winter. Use a very well-drained substrate, specific for cacti. The most common mistake to avoid is overwatering, which can lead to root rot.
How to save a dying Dagger cactus
- Warning signs
- Stem soft and watery, yellowish or brownish discoloration from base.
- First aid
- Remove plant, inspect roots. Cut soft parts with clean knife. Let dry for 2-3 days.
- What kills it
- Overwatering and non-draining soil cause rapid, fatal rot.
- Can it be saved?
- Yes, if rot hasn't reached the apex. Repot in dry, well-draining soil.