cactushobbyman wrote:You must be getting lots of sunshine. Here, rain in California in May, not unheard of, but needed.
It was reported that April was the sunniest on record in the UK, but it didn't seem so here. Very few days of unbroken sun, but I suppose very few days of unbroken cloud either. Chilly nights too and May has continued that way, but I suppose good weather for a cactus in a greenhouse.
Just looking at the numbers for where I live and it says an average of over 6 hours sunshine a day during April. I find that astonishing. Normal would be closer to 3 hours a day and I just wouldn't have guessed we had double the normal amount of sunshine. I imagine you're still averaging more than that even with all the rain?
Heat will often reflex the flowers. All my Sulcorebutia's and Rebutia's are on the top shelf up near the roof of the greenhouse and it is noticeably warmer up there when I get up to them rather than the temperature at normal staging level.
Yours was not really trying to fully open Ian, This was my Sulcorebutia patriciae today up on the top shelf in the greenhouse (probably S. patriciae is really just a yellow spined form of S. hertusii/senilis).