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maybe not freely but twice a week, or so, and every time I water my Pelargoniums
john--are your plants in the house or greenhouse?for sure you have to be careful with water when its cool, but the issue isnt just what the lows are, but whether it warms up in the daytime..here, i wouldnt even bother putting tender plants outside--we often have single digit night temps even in mid-summer; this year, there were frosts or warnings in every month! and rainy weather is commonly quite chilly, not a good combo for really tender c+s..i havent tried conos yet, but really hoping to..of course that's a whole different cycle, winter growing; apparently they can be handled in low light midwinters by watering mainly fall and spring; i have a lot of haworthia, which i water year round, with a partial break in mid-winter and mid-summer, i probably do about the same with the few adros i have..
And was it Harold Esslemont who showed a dead Raoulia eximia regularly for many years?Even if yours is dead John, I'd get out a paint brush and some dull green paint. You could perk it up no end.
It may amuse you to hear that at one of the shows of the Victoria Horticultural Society, many years ago, the judges of the houseplant category pointed out that one cactus entered was in fact as dead as a doornail.It was one of those species that's wrapped up in white hair.