Re: Dead cyatheas and dicksonia
I breed 17 years with tree ferns, and I have experimented a lot with C.medullaris and have tested all the options cold, dry and hot conditions, the first and the last are serious killers!
G.B. has a milder climate and is much more beneficial for this tree-fern culture, I'd also wait a while for them and take care, you'll see what's happening, good luck
P.S. de C. australis still seems in reasonable condition, which can have much more than C.medullaris.
Eduard.