Last weekend saw the annual ritual of root pruning my bonsai. I've been growing this large maple for more than 10 years now. I found it in an indoor nursery on Polk street. Five years ago I started cultivating this tree on a slab of red Arizona sandstone.
Not a whole lots of difference but that took about an hour.
Another perspective, before above, after below.
Replanted onto fresh potting mix layer about 3/4" thick.
A grouping of five trident maples on rock slab.