Being new to Zonartic Pellies I have been watching mine closely, checking them every morning. The rooted cuttings started to show signs of yellowing first and I decided to give them sequestered Iron seaweed to see if it was a problem with lime induced Iron chlorosis. That seemed to help a bit.
Yesterday I noticed the large, flowering plants looked a bit sad. After a bit of research I found out that the kind of heat we are having now - in a greenhouse, is excessive. It seems the Zonartics are more susceptible to the heat than the Zonals so they took a little trip this morning into a semi-shaded, well ventilated (missing panes) glass house.
I moved all of the Zonartics large and small. I suspect they may go into a Summer dormancy period so I will keep the watering fairly restricted and see how they go. The Zonals in the same structure (A Keder house) are thriving and now will have more space.
Lia Princess Charlotte is the worst affected by the heat (pic below) quite a few leaves lost and the flowering buds appear to be aborting. It is overwatering, I am very cautious about that as I know that it is all to easy to see an unhappy plant and kill it with the kindness of extra water!
I’ll watch closely to see how the Zonartics respond - for me this is part of the fun, getting to know the plants and their various needs and dislikes.
I've ended up planting my few Pellies because it's easier to manage their rootzone that way¹. They're grateful judging by their response.
I realise I've just pushed the problem back to when I need to lift and re-acclimatise them to pot growing but so be it.
¹All bar one, this one I've washed the compost off the roots and potted in 8-12mm leca and am growing hydroponically in the dining room window, so far so good.