OK, the ‘real’ quince 😊 cydonia oblonga, mainly fruits on the new growth made the year before, on the tips of these new shoots, so of you keep pruning it hard to form a neat, rounded shrub, which is not what it it wants to be, you are pruning off the bits that produce flowers and then fruit. Pruning the centre a bit to remove congestion/crossing branches to help with air circulation and reduce fungal infections is a good idea, as @strelitzia32 says, plus any obviously dead/non-productive branches and any suckers growing from the base, but otherwise I would let it do it’s own thing and see where you get to next year.
If it’s flowering well but not producing fruit, there are a number of reasons for that. They are largely self-fertile but having another quince nearby does help with pollination and fruiting. If it’s in a windy spot, could be you are losing the flowers before they get a chance to be pollinated. They like moist conditions, so of it’s under-watered and/or in very poor soil it may not have the energy to produce fruit. Like any trees, they resent competition from grass (although at 7 years old it should cope with some) so keep a large circle around it clear of grass, in Spring give it a really good deep watering and a mulch of well-rotted manure but not in direct contact with the main trunk. Keep it well watered and your fingers crossed.
We make jellies, membrillo and our fav, quince tarte tatin - so much nicer than apple TT imho!
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
I have a quince tree which I bought as a 5 yr old dwarf standard. Vranja. It is now 12 yrs old and about 15 ft. I prune it each year, I take off any damaged growth, any inward growing branches, crossing branches and spindly growth. I then stand back to admire my handiwork before cutting back any overlong branches to a bud. My tree grows very vigorously so this means I end up with a surprisingly large pile of unwanted wood. Fruiting quince do not have thorns. As an experiment I pruned my tree in August this year, hopefully to promote fruit rather than growth. I am a bit concerned now as it produced a lot of new growth by the autumn which was caught by a couple of unexpected frosts. I have to wait until next year to see if my action was a good one as I had hoped it would cut down on the growth and slow down flower production. My tree is covered with lovely blossom in early Spring which is mostly stripped off by the Spring gales, it then has some later blossom but most of that is too later set fruit which has enough time to mature into fully grown fruit, which means that so far I have not had many fruit to pick. If I continue to have a sparse crop I am considering cutting the tree down as my prime reason for growing it was for the fruit.
@bertrand-mabel I've tried quince in quite a few different ways, but I just don't like them unfortunately! It's the same with raspberries and most currants. I like blackberries and blackcurrant, but don't like any of the others.
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If it’s flowering well but not producing fruit, there are a number of reasons for that. They are largely self-fertile but having another quince nearby does help with pollination and fruiting. If it’s in a windy spot, could be you are losing the flowers before they get a chance to be pollinated. They like moist conditions, so of it’s under-watered and/or in very poor soil it may not have the energy to produce fruit. Like any trees, they resent competition from grass (although at 7 years old it should cope with some) so keep a large circle around it clear of grass, in Spring give it a really good deep watering and a mulch of well-rotted manure but not in direct contact with the main trunk. Keep it well watered and your fingers crossed.
We make jellies, membrillo and our fav, quince tarte tatin - so much nicer than apple TT imho!
As an experiment I pruned my tree in August this year, hopefully to promote fruit rather than growth. I am a bit concerned now as it produced a lot of new growth by the autumn which was caught by a couple of unexpected frosts. I have to wait until next year to see if my action was a good one as I had hoped it would cut down on the growth and slow down flower production.
My tree is covered with lovely blossom in early Spring which is mostly stripped off by the Spring gales, it then has some later blossom but most of that is too later set fruit which has enough time to mature into fully grown fruit, which means that so far I have not had many fruit to pick.
If I continue to have a sparse crop I am considering cutting the tree down as my prime reason for growing it was for the fruit.