M9 Trees in pots, when to plant

in Fruit & veg
Hi, I purchased two M9 rootstock trees from Tesco back in Feb, One pear conference and one Victoria plum.I did plant these after purchase on some spare land I have away from my house, however I've had to move them after some vandalism to other plants I have on the land. I've temporarily moved them to large bell pots, the plum tree (I believe its the plum tree as Ive moved them about and stupidly not labeled) looks quite merry and has started to grow leaves, the pear tree is completely bear though. My question is how long can I keep them in pots for? I still haven't quite decided where to put them.
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M9 rootstock is an apple rootstock, producing an apple tree which is roughly 10’ high by as much across. Not really a suitable size tree for a pot.
However, you say that you have a plum and a pear. Plum trees are grafted onto various rootstocks, see here:
https://www.orangepippintrees.co.uk/articles/rootstocks-for-plum-trees
and pear trees are grafted onto quince rootstocks.
So we have a couple of mysteries there.
Anyway, the “plum” is obviously alive. It would clearly be happier growing in the ground, if that is possible. The “pear” sounds as if it is dead.
If you live in Derbyshire, as I do.
If you live in Derbyshire, as I do.