Cleistocactus winteri (crested form)

Origin of Cleistocactus winteri (crested form)

This is a cultivated crested form of Cleistocactus winteri. The species comes from Bolivia, where its habitats include cliffs in seasonally dry forest in the Andean valleys. The crest is also known by the established horticultural name Hildewintera aureispina f. cristata.

Caring for Cleistocactus winteri (crested form)

A bright full-sun position suits it once direct light has been introduced gradually. Keep temperatures around 18–28 °C, avoid prolonged temperatures below 5 °C and keep the cactus frost-free.

Aim for 40–50% humidity in a well-ventilated room. Normal indoor air is suitable, including relatively dry rooms.

During active growth, water thoroughly once the freely draining cactus mix has dried fully, and let surplus water drain. When growth slows in cooler, lower-light conditions, give much less water.

During active growth, use a potassium-rich cactus fertiliser at a light dose.

When roots fill the pot, repot into a slightly larger container. Wait a few days before the first watering. After that pause, return to the normal watering routine for the plant’s current growth rate.

Support the folded stems carefully when moving or repotting the cactus.

Cleistocactus winteri (crested form): problems and solutions

• Collapse or softening while the mix stays wet: Root rot is possible. Stop watering and empty any water collected beneath the pot. If decline continues, inspect the roots. Firm roots can remain; let the mix dry completely before watering again during active growth and give much less water while growth is slow in cooler, lower-light conditions. If the roots are soft and brown, first check whether enough firm healthy roots remain and whether the cactus body is still largely firm. If both conditions are met, cut the rotten roots back to firm healthy tissue with a clean, disinfected tool and discard them. Keep the uprooted cactus dry and shaded until the cut root surfaces have dried thoroughly, then replant it in dry freely draining cactus mix in a clean pot with drainage holes. Wait a few days before watering. After that pause, water thoroughly only while the cactus is actively growing and the mix is completely dry; continue to give much less water while growth is slow in cooler, lower-light conditions. Extensive softening of the cactus body may be fatal.
• New cottony colonies between the folds: Mealybugs may be present, although pale areoles and spine bases occur naturally. Inspect the folds and joins, separate the plant if you suspect an infestation and remove insects you can reach. If they persist, use a product labelled for mealybugs on this houseplant indoors. Test a small area before wider spraying, follow the label's instructions and repeat interval, and keep checking until the infestation is controlled.
• Unexplained decline or new cottony material at the drainage holes: Root mealybugs are possible. Ease the root ball out if an established plant keeps looking weaker without another clear cause, or if suspicious cottony material appears at the drainage holes. Look for white powdery wax around the roots and slow-moving whitish oval insects. Excess moisture or decay can also cause decline, so confirm the insects or wax before treating for root mealybugs. If root mealybugs are confirmed, isolate the plant, keep its drainage water away from other plants and clean equipment that touched the infestation. Use only a treatment labelled for root mealybugs on indoor ornamental plants and follow its application instructions. Root mealybugs can be hard to get rid of completely. If the roots are heavily infested, disposing of the plant may be the most practical option.
• New pale, bleached or dry scorched tissue: A sudden increase in intense sunlight can cause this damage. Reduce the harsh exposure and reintroduce stronger light gradually, keeping to bright filtered light or gentle direct sun.

Cleistocactus winteri (crested form) has sharp parts

• Keep this plant away from children and pets because its effects after chewing or swallowing are unclear.
• Sharp spines can puncture the mouth, eyes, skin or paws.
• Handle it carefully. Contact a veterinarian or medical professional after a serious injury, especially to the eye.

What does the name Cleistocactus winteri mean?

Cleistocactus refers to the narrow flowers that open only slightly. Winteri honours Hildegard Winter.

Charles Lemaire established the genus Cleistocactus in 1861 in L’Illustration Horticole, volume 8, issue Misc., page 35.

David Richard Hunt first described Cleistocactus winteri in 1988 in Bradleya, volume 6, page 100.