The right conditions can be very tricky to find with calathea. I keep
mine on the other side of the room to the window and well away from a
radiator but they seem to do better when surrounded and overshadowed by
other plants. They're a natural understorey plant from humid forests so
need less light than you think. We dry clothes in the same room every
day which helps keep the humidity up and I mist it a lot but still get
dry tips to the leaves. I think it's still too bright where it is but
it's putting out loads of new leaves at the moment so it's fairly happy. A couple of brown spots are from where my wife lit a candle too close to it though
I have one like @wild edges's one. It's hard to keep it looking nice all the time. It looks great for a while, then lots of leaves die off for no apparent reason (it doesn't even seem to be seasonal) and then just as I'm thinking of chucking it out, it grows a whole load of fresh leaves and the cycle starts again.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.