I grow Wilcoxia (Echinocereus) poselgeri collected in S. TX. It needs big
pots for such a thin cactus because of the tuberous roots. Enormous purple
flowers, sometimes five at a time on the top of a stem smaller than your
little finger. It is sensitive to sucking insects so I always use a
systemic insecticide. Sometimes individual plants die in winter for no
apparent reason so it is good to keep propagating it from cuttings. Others
have reported this problem too. I suspect that older plants may fill their
pots with the tuberous roots and suffocate. One day I'll get around to
posting photos on the Wiki. monica
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