Thanks so much
@purpleinopp !
It does look like the photos in that link you shared. It says "Maximum recommended zone: Zone 11" - what do the zones mean?
The local water authority says they don't add fluoride to our water and naturally there is 0.13 ppm.
They also say the calcium carbonate level is moderately high (i.e. the water is quite hard), at 274 ppm. Could that have an impact?
Also I note the link you sent said the plant likes shade, could my leaves be getting burnt from the (albeit intermittent) British sun?
Thanks so much for your help
