Did the roots of the tree have quite a long centre tap root? If so, I fear it could well be a walnut sapling - we have a large walnut tree next door and I'm forever digging up saplings all over the garden and they have very long roots.
Your little tree could grow 100 ft! - Just joking, in a pot it wouldn't grow much, as long as the root doesn't root into the ground underneath the pot and I see you have a pot saucer anyway.
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Did the roots of the tree have quite a long centre tap root? If so, I fear it could well be a walnut sapling - we have a large walnut tree next door and I'm forever digging up saplings all over the garden and they have very long roots.
Your little tree could grow 100 ft! - Just joking, in a pot it wouldn't grow much, as long as the root doesn't root into the ground underneath the pot and I see you have a pot saucer anyway.