I've since chopped this tree to free it from the grille. I'll keep an eye on the lower part and see how it develops.
I took some cuttings from one of the trees. They range from pencil thick up to about 3/8 inch. I placed them flat in a sheltered spot in the garden and covered them with some soil and leaf litter. I read somewhere you can bury cuttings to keep them dormant during winter until weather improves for planting. I'll go back to them in early spring and try planting them in the ground with rooting gel.
I do have a small flower garden with some space available, however, I am aware that this space will fill up pretty quick as I experiment with bonsai material.
I found another abandoned tree with interesting exposed roots. I may have a go with this one.
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