If it's dry (and more so if it's warm as well) the plants in containers will need watering, particularly the acer because the pot looks quite small for the size of the plant. Can you get someone to come in once a week and give them a drink?
Doncaster, South Yorkshire. Soil type: sandy, well-drained
I'd rather have someone water them, but that can be tricky if they don't know exactly what to do, or they forget, and even if you're in a damper, cooler area, they could dry out quite easily at that time of year, unless there was persistent, regular rainfall for the entire time. If you're in one of those very dry parts of the UK, it's very dodgy. Once they dry out, it would be very difficult to rehydrate them, and although a timer might help in that sense, you'd have to accept that it isn't 100% reliable either.
Grouping potted plants together in a shady spot, with some others as well, will help with moisture loss, but they'd still need that regular watering.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
In the past I bought a cheap kids paddling pool not the inflatable type the rigid fold away sort, put it in the shade put the most likely pots to dry out in it and added a couple of inches of water and that kept the plants happy for a couple of weeks and that was during during July, August.
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Once they dry out, it would be very difficult to rehydrate them, and although a timer might help in that sense, you'd have to accept that it isn't 100% reliable either.
Grouping potted plants together in a shady spot, with some others as well, will help with moisture loss, but they'd still need that regular watering.
I live in west central Scotland - not where that photo is...
I put my plants in deep, cool shade and stand on a capillary mat whose end is in as big a reservoir as I can find. Do you have the time to do a trial.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."