Armatocereus riomajensis is a columnar cactus native to Peru, characterized by its ribbed stems and nocturnal white flowers. It thrives in arid conditions.
At-a-glance light, water, soil, and growing conditions from plant data
Full sun to partial shade
75% intensity
Prefers bright, direct sunlight
Allow to dry out completely between waterings
25% intensity
Reduce watering in winter
Well-draining cactus mix
50% intensity
Warm to moderate
50% intensity
Prefers temperatures between 18-27°C, avoid frost
Infrequent
25% intensity
Diluted cactus fertilizer during growing season
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Allow the soil to dry out completely between waterings. Reduce watering significantly during the cooler, dormant months. Overwatering is a primary cause of root rot, so err on the side of underwatering.
Ensure good drainage to prevent waterlogged conditions.
Pruning is rarely necessary for Armatocereus riomajensis. If removal of damaged or unwanted stems is required, use a clean, sharp knife or saw. Allow cuts to callus over before replanting if desired.
Minimal pruning helps maintain its natural columnar form.
Propagate by stem cuttings or seeds. Allow cuttings to callus for several days before planting in well-draining soil. Seeds should be sown on the surface of a sterile, gritty mix and kept warm and moist.
Patience is key for seed germination.
Repot every 2-3 years or when the plant outgrows its container. Use a gritty, well-draining cactus mix. Choose a pot that is only slightly larger than the current one.
Repotting is best done in the spring before the active growing season begins.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Armatocereus Riomajensis (Armatocereus riomajensis)
Where Armatocereus Riomajensis (Armatocereus riomajensis) is found
Density
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Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Caryophyllales |
| Family | Cactaceae |
| Genus | Armatocereus |
| Species | Armatocereus riomajensis |
Similar in genus Armatocereus
Answers based on plant encyclopedia data
