When they die down in the autumn I would cut them back a bit and try to separate them, 3 plants in one container is never going to work well, next year they will grow even bigger, they’re big trees they need space.
Gardening on the wild, windy west side of Dartmoor.
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Dont overdo it ...too much is worse than too little. Just what it says on the pack.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
water first for thirst.👍👍👍