If I’m using a colander/plastic plant basket as a substitute for ground growing, how large should I aim for? E.g. 12 inches across, 5 inches deep.
Suggestions for inexpensive options that will hold particles as small as 1/8"? If the “will hold small particles” piece isn’t realistic, how do other folks handle it – just line the whole colander/basket with a plastic bonsai screen?
ETA: assuming my goals are (1) first stage trunk/branch thickening for trees with up to 2" diameter trunks, many of them much less, and (2) portability given I’m likely to be moving cross country within 1-2 years and hauling 50+ trees with me.