They look like they could do with some TLC. It'd be worth taking them out of the the pots to see if they are rootbound, and if so, re-pot in a pot a few inches wider using ericaceous compost. A feed once a fortnight though the summer will help them get back into shape and seaweed extract alternating with the feed once every 2 weeks will help too. I think you need to encourage some new shoots - Some info and a video here
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
Those do indeed look tired and could do with some of the older branches cutting back hard, as well as a re-pot into ericaceous compost. That should encourage strong new shoots from the base which will carry future year's crops. Unfortunately, it's a bit late to do that this year but possibly worth risking. Safer would be to carefully (the feeding roots are close to the surface) loosen and remove the top 5cm or so of compost and replace with fresh ericaceous then feed with a liquid feed for acid-loving plants. Remove any dead or weak branches then wait and see. The fact that there is a fern growing in one of the pots makes me think they've been in the shade when they need lots of sun to do well.
A trowel in the hand is worth a thousand lost under a bush.
Wait until the bushes are in full leaf and then remove any dead twigs, Other than that, leave them alone, keep them damp and preferably in dappled shade if possible. Treat them as azaleas, camellias or rhododendron. Acid loving plants.
I have Duke, Hertbert and Harrow, early,mid and late, in pots 13" diameter, by 12" hig, ericaceous compost,and feed. I had a good yeald from them last year. i bought them as a set, says they arent alwys 100% hardy, I am in SE UK 10 minutes from the sea, this last winter when we had 2 nights of -12d I bunged them in the greenhouse, when the fruit ripens you have to watch the birds, mine used to go into a fruit cage, they are now 2 years old, a lot bigger, only 2 will fit in there the 3rd will be covered with chicken wire, or brought up near the house.
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They look like they could do with some TLC. It'd be worth taking them out of the the pots to see if they are rootbound, and if so, re-pot in a pot a few inches wider using ericaceous compost. A feed once a fortnight though the summer will help them get back into shape and seaweed extract alternating with the feed once every 2 weeks will help too.
I think you need to encourage some new shoots - Some info and a video here
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.