Genrepediocactusis known for its resistance to cold but above all for its difficulty in cultivation. For my part, I think this is due to its particular growth rate. If you follow a few rules specific to this genus, their cultivation goes well and you will even be rewarded with flowering. Their growth period starts earlier than other genus of cacti andpediocactusrest during the hot summer period. They are therefore similar toaustrocactus. They appreciate early watering and good ventilation. If possible, do not leave them in a confined environment such as a greenhouse or provide enough ventilation. For my part, I cultivate them under a simple protection against the rain where the air can circulate freely. I also have a frame with openings on the side in the windiest part of the garden. I present to you below the species that I have in culture at home and the specific information that I have noted for each species. 

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Pediocactus simpsonii

• Water in late February/early March until May even if it still freezes for the main growing season

• Stop watering when night temperatures do not drop below 10-12°C (generally corresponds to the summer period)

• Provide enough water in the fall for the production of flower buds

• Water in autumn for the secondary growth period from September to November

To go further: Journal of the BCSS Cactus World vol 39 no 3, September 2021

Pediocactus knowltonii

• Watering at the end of February/beginning of March even if it is still freezing

• No water in summer (late June to late August). Plants go dormant.

• Water at the end of summer when the days are getting cooler and stop watering in October

Pediocactus peeblesianus 

• Watering at the beginning of March even if it is still freezing

• No water in summer (late June to late August). The plants go to rest. 

• Water at the end of summer when the days are getting cooler and stop watering in October