Deep rip the area first, then plant a mix of cover crop, say millet or sorghum; it doesn’t matter so long as you put in as many varieties as possible. Plan where the avocados will go and plant bananas in rows around them. This can also be achieved on a micro scale in the backyard. Once growing, do not make tidy. Chop up mulch and coarse substrate and leaves (not grass clippings) and put around the tree bases. Be sure not to remove lower branches that touch the ground.