You'll need to remove the plant from the pot, add more soil based compost at the bottom, then place your plant on top of this base to raise it up to 1 or 2 inches from the top of the pot. The tree won't be stressed if you are careful to avoid damaging the roots when you remove the rootball. Adding compost without repotting will mean that the junction of the root and stem which should be at ground level will be submerged, leading to problems with rotting and eventual plant decay.
Your bulbs won't be harmed by putting compost on top, they are designed to adapt to differences in soil levels - deeper is often better. Again, make sure your pot is raised to enable good drainage.
Somebody mentioned i have the apple tree pot on top of the grass and it was affecting the drainage
Last year I had that problem and I added some wood pieces to raise the pot, see picture attached. If this is not a good solution, as it looks like, what would you suggest, given the pot will always be on the grass?
When you repot, make sure the drainage hole in your pot is clear and cover it with a tent-like collection of broken crocks such as old terracotta pots, just to stop the compost falling out but not to block water draining. Add some horticultural grit to your soil based compost, this will ensure better drainage. Being on grass is fine as long as the pot has clearance to drain.
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Your bulbs won't be harmed by putting compost on top, they are designed to adapt to differences in soil levels - deeper is often better. Again, make sure your pot is raised to enable good drainage.
Last year I had that problem and I added some wood pieces to raise the pot, see picture attached. If this is not a good solution, as it looks like, what would you suggest, given the pot will always be on the grass?
I live in west central Scotland - not where that photo is...