Those pots need a good drenching to soak the compost thru and then a regular deep drink, not a dribble. In spring, mine get a good bucketful or watering can full each week with more frequent drinks as the weather heats up.
If they've been in those pots a while they'll also need some fertiliser.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
If they've been in those pots a while they'll also need some fertiliser.