Buxus Blight? Lack of sunlight? Watering?

Hi all, I have several Buxus Balls (no sniggering!) in wooden containers which I look after - however I'm only at this garden once a week. I'm assured that they get a regular watering. When I'm there I give them 6 litres of water each - they're about the size of a Beach Ball (maybe 1.5ft high). I gave them a feed of BF & B a few weeks back. Please see attached images - any thoughts?


Kind regards
David




David

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Wind damage and lack of water are also possibilites. Have you checked to see if the soil/compost is moist around the roots? If they get quite a bit of sun, they may well have dried out so much that water isn't penetrating well. Some might be exposed more than the others too.
If it is blight [and I'm not familiar with it] it's a much bigger problem. Good air flow and quite drastic pruning may be needed. Easier when they're potted specimens though.
I live in west central Scotland - not where that photo is...
David