Nice flowers Carol. And Fredman is ''the source'' or one of a few good sources, for good info on African and New Zealand plants. He spent most of his life growing bonsai in South Africa, has only been in NZ less than a decade.
If you would like a small bonsai with a ''fat trunk'', next spring when you repot the Grewia, move it to a gallon size nursery can or an 8+ inch pot. Let it grow, let a leader grow as tall as you have room for. Keep the lowest branches down in the size range you want the finished bonsai, pruned short. Let the leader go up without pruning. Let it go this way until pot bound, or you physically have no room. Then in 3 or so years you will have a trunk over 1 inch, then you can chop it down to size. With broadleaf trees, you grow the trunk first, then worry about the branches later. Fat trunks is what separates okay great bonsai from average bonsai. This techniquw can be applied to all your tropical, sub=tropical and deciduous broadleaf trees. A variation of this is used for conifers too, but there are a few additional tricks for pines and such. If you find you don't have room, then prune short. but at least a few of your trees you should try the ''growing a trunk'' techniques.
