It's a decorative crabapple, I think. I wouldn't try to straighten it for the reasons WillDB mentioned - the canopy would then be lopsided and look very odd indeed. It'll probably develop real character after couple of decades, left to it's own devices. If it's in the way or you don't want crabapples falling on your drive, then it wouldn't be too big a job to replace it with something else, while it is still at this size.
A trowel in the hand is worth a thousand lost under a bush.
I believe you could straighten the tree eventually. You would need a lot more than straps & staking though in my opinion.
If you bought a 2nd hand lever hoist from somewhere like E bay, that would be helpful. I bought one with a 6 Tonne lifting/pulling capacity. I had tree roots to remove, and it perfonrmed the job very well. The issue is, you need something solid to anchor the lever hoist to.
Once the tree is staightened up, the branches of canopy can be trimmed and shaped over time.
This is the lever hoist I got from E bay-great tool.
Is it really worth that effort though? Much better to remove it and replaces it with something that's properly staked and looked after, IMO. It clearly hasn't been staked and supported from the start, and it's never going to look good.
It's a place where beautiful isn't enough of a word....
Is there any rock in the trunk now? If there's a tiny bit then I reckon you could improve it over time, but it would be slow as can only do it very gradually. So several years. And the canopy would sort itself out eventually as well, perhaps with a bit of shaping.
I’m a lazy gardener, so I’d leave it as I don't mind wonky trees. But if it bugs you, and given that you’ll never get it perfect, perhaps you should just replant?
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What are the lines girdling the trunk, and has the bark at the base been damaged by strimming?
Do you think it will be ok like it is or need removing eventually?
It clearly hasn't been staked and supported from the start, and it's never going to look good.
I’m a lazy gardener, so I’d leave it as I don't mind wonky trees. But if it bugs you, and given that you’ll never get it perfect, perhaps you should just replant?