What can I do with this tree?

Last year I was given a sapling of a crab apple. I think it originally came from a Woodland Trust local giveaway. I put it in a pot, forgot about it and now it's leafing out. I've space to grow this tree, but should I leave it in pots a while for it to establish? Anything else to do?

Cheers

 

I’d plant it in the ground if you have a suitable space. It will be easier to control watering and give the roots a chance to spread outwards as well as down.