Central Texas is probably too cold to grow Ferocactus outdoors in the ground. They could be summered outdoors and brought in for the winter, maintained dry all winter. They do fine with warm, wet summers so long as the potting mix is maintained alkaline. This means no organic matter in the soil. Ferocactus are highly susceptible to fungus in acid soil mixes, which I think partly accounts for their reputation as difficult in cultivation.
Golden barrel (Echinocereus grusonii) would likewise do great outside for the summer, then brought in for the coldest weather. So long as days get above freezing it easily handles temperatures into the upper teens F / -8C. It isn't too picky about being cold and wet, and it does really well in hot and wet.
The Soherensia and probably most Echinopsis should tolerate the winters outdoors if well-drained. It doesn't rain much in the winter in central Texas. For some reason people in the US who could grow Soherensia outdoors just don't. It is hard to find here.
In habitat Soherensia gets enormous. It is a slow growing plant, however.
Last edited by estación seca; 01-19-2018 at 10:51 AM..
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