Sun Cup - Notocactus agnetae

Flowers: bright yellow Blooming season: It produces several flowers at a time from spring to early summer that remain open for about three days. Watering: Water in moderation, it prefers a completely dry place during winter. Keep dry in winter or when night temperatures remain below 10° C. Water it less than average if in bigger pots. Special needs: Provide very good ventilation. Nearly all problems occur as a result of overwatering and poor ventilation, especially when weather conditions are dull and cool or very humid. Exposure: It will do its best with lots of sun and becomes stressed with inadequate light. Hardiness: It likes warmth (recommended minimum winter temperature 5° C) however plants kept perfectly dry can survive low temperatures, approx. -5°, but for safe cultivation it is best to avoid freezing temperatures   Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz