Echinocereus poselgeri is a shrubby cactus, initially erect, later sprawling or clambering. The stem is very tall and slender, dark colored up to 4 feet (1.2 m) long and up to 0.8 inch (2 cm) in diameter. The spines are tan-grayish white. The flowers are pink rose to pink-purple. The fruits are up to 0.8 inch (2 cm) long, up to 06 inch (1.5 cm) in diameter and dark green to brownish in color.
Do not over water. They need to be kept in a cool, dry place during winter rest (at -5 +10°C). This is important for the flowers as well as for their health. Without this cool winter period they normally won't get any buds. It is quite frost hardy -7 (-10)° C. Sun Exposure: Best in full or partial sun exposure. In mild climate they grow well when planted freely outside in well-drained soil. Traditional uses and Trade: The species is found in Mexican trade, and the root is used locally as veterinary medicine (broken bones) and considered an anti-inflammatory. It is used as an ornamental. Syn: Cereus poselgeri, Cereus poselgerianus, Cereus tuberosus, Echinocereus kroenleinii, Echinocereus tamaulipensis, Echinocereus tuberosus, Echinocereus waldeisii, Wilcoxia kroenleinii, Wilcoxia poselgeri, Wilcoxia tamaulipensis, Wilcoxia tuberosa