I've grown these from seed and their a little over a year old. They've naturally grown crooked, I would like to trim so the trees grow straight again, where should I prune?

I would not prune for several years yet. I might tie them gently to a stake..

Coppice said:I would not prune for several years yet. I might tie them gently to a stake..

I'm giving them away so they need to be ready for planting. When I planted mine it was slightly smaller than these but growing straight so I never had to prune.

Coppice said:I would not prune for several years yet. I might tie them gently to a stake..

Ditto.

A stake will sorta straighten the tree out... but I'd hold off on the stake, these trees don't look large enough for any rough handling.

Trees have a way to naturally straighten the main leader... if we leave them be.

When we cut the main leader off... they turn into bushes...
All the buds near the cut will send out new growth... and instead of one sorta crooked main leader, you'll have multiple main leaders, and they will more difficult to fix than what you have now...

stone said:

Ditto.

A stake will sorta straighten the tree out... but I'd hold off on the stake, these trees don't look large enough for any rough handling.

Trees have a way to naturally straighten the main leader... if we leave them be.

When we cut the main leader off... they turn into bushes...
All the buds near the cut will send out new growth... and instead of one sorta crooked main leader, you'll have multiple main leaders, and they will more difficult to fix than what you have now...

Ok I understand now not to prune. I will tell the new owners to leave the tree be it will grow other branches and fill in and even itself out.

Do they look healthy otherwise?

I think J. maples look good when allowed to twist and turn, and I tend to purposely prune mine to encourage that. Just another thought/option.