Thank you Pete.8 that could be it. I will buy some seaweed extract tomorrow. Fingers crossed all will be well. I have about 12 Acers & this is the first time I’ve had any probs. Eileen107
The white marks you're talking about could be powdery mildew, or could be signs of a nutrient deficiency. Try mix a fertilizer for acid-loving shrubs/trees into the soil around the root zone and that might help clear up the white spots.
It's mildew as @Pete.8 says. Nothing to do with water on foliage in sun. Another myth. It doesn't need fed with an acidic food either. Good hygiene [ie airflow] adequate watering, and good soil are the way to keep it happy. If it's in a container, which I'm guessing as you mentioned compost, and will be long term, it needs more than compost. It needs a soil based medium. Compost is no use as it dries out too easily. Garden soil- if you have some that's not alkaline, with some grit for aiding drainage, is fine, or you can buy a branded product. Keep adding a layer of similar, and a top layer of fine bark or similar every so often to keep that right
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I did a tap water watering to my pot hostas in full mornibg sun today. Beads of water remained on the less waxy and more cup-shaped leaves. Carefull checking showed no lens-burning. But some grey spots. I guess evaporated hardness salts.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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Eileen107
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Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
It doesn't need fed with an acidic food either. Good hygiene [ie airflow] adequate watering, and good soil are the way to keep it happy.
If it's in a container, which I'm guessing as you mentioned compost, and will be long term, it needs more than compost. It needs a soil based medium. Compost is no use as it dries out too easily. Garden soil- if you have some that's not alkaline, with some grit for aiding drainage, is fine, or you can buy a branded product. Keep adding a layer of similar, and a top layer of fine bark or similar every so often to keep that right
I live in west central Scotland - not where that photo is...
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."