Been away working down south for a few months, so asked a neighbour to look after the CP's and cacti in the greenhouse with clear, written instructions - rainwater for the CP's, tapwater and cacti food for.... well I suppose you can guess what that was for Keep the CP's moist during the winter, increase water in the spring.
On my return a couple of weeks ago, the cacti were still looking good, but the CP's decidedly less so. It turns out he was using tapwater for the CP's as well as for the cacti, complete with cacti food (and he also got the measures wrong - instead of 1/2 teaspoon per 5 litres, he was giving 1 teaspoon per litre). He did get one thing almost right though. I told them they like regular spraying, so he sometimes sprayed them with one of my watering cans (instead of the plant sprayer that is in the greenhouse). Unfortunately he used the red watering can, which i use for weedkiller I don't know if that contributed to the almost total wipeout, but....
So, now I'm saving up my pennies for when I to to Stephen's open day. If you're going there too, bring lots of plants with you, I've got a greenhouse to fill