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Trichocereus pasacana, commonly known as the Cardón grande or Argentine saguaro, is a large columnar cactus native to South America, particularly in Argentina, Bolivia, Chile, and Peru. Here's a care sheet based on factual information for Trichocereus pasacana:

Light:

  • Light Requirements: Trichocereus pasacana thrives in full sun to partial shade. It prefers bright, indirect light or direct sunlight for several hours a day. In hotter climates, provide some protection from intense afternoon sun to prevent sunburn.

Watering:

  • Watering Needs: Water Trichocereus pasacana deeply but infrequently. Allow the soil to dry out completely between waterings to prevent root rot. During the active growing season (spring and summer), water thoroughly when the top several inches of soil are dry. Reduce watering in fall and winter when the cactus is dormant.

Soil:

  • Soil Type: Plant Trichocereus pasacana in a well-draining cactus mix. A mixture of sandy soil with perlite or gravel provides good drainage and mimics its native soil conditions.

Temperature:

  • Temperature Range: Trichocereus pasacana prefers warm temperatures between 70-90°F (21-32°C) during the growing season. It can tolerate temperatures down to 50°F (10°C) but should be protected from frost, as it is not frost-tolerant.

Humidity:

  • Humidity Preference: Trichocereus pasacana prefers low humidity levels typical of desert environments. It can tolerate dry air and does not require high humidity.

Fertilizing:

  • Fertilization: Feed Trichocereus pasacana with a balanced, diluted fertilizer formulated for cacti once a month during the growing season. Refrain from fertilizing during fall and winter when growth slows down.

Propagation:

  • Propagation Methods: Trichocereus pasacana can be propagated from stem cuttings. Allow the cuttings to callus for a few days before planting them in well-draining soil. Keep the soil lightly moist until roots develop.

Pruning:

  • Pruning Requirements: Minimal pruning is needed. Remove any dead, damaged, or diseased parts of the cactus with clean, sharp scissors or pruning shears.

Pests and Problems:

  • Pest Control: Monitor for common cactus pests such as scale insects or spider mites. Treat infestations promptly with insecticidal soap or neem oil. Ensure good air circulation around the plant to prevent fungal issues.

Potting and Repotting:

  • Repotting Needs: Repot Trichocereus pasacana every 2-3 years or when it outgrows its current container. Choose a slightly larger pot with drainage holes to accommodate its root system.

Special Care Notes:

  • Trichocereus pasacana is a slow-growing cactus that can eventually reach significant heights in optimal conditions.
  • Avoid overwatering, as this can lead to rot. Allow the soil to dry out between waterings, especially during the dormant winter period.
  • Provide bright light and occasional direct sun exposure to promote healthy growth.

By following these care guidelines, you can help your Trichocereus pasacana thrive and showcase its impressive columnar growth and potentially beautiful flowers in your cactus collection or garden.

Trichocereus pasacana

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