crazy banana

My intention is to expand the growing area around each individual plant. Originally the plants were planted in holes amended with lots of compost, gypsum and mulched over in about 4' circles. We have put some border edges around them. The tallest plants are about 10 ' , with some nice size pups. So I am pretty sure the roots have already outgrown those circles. Anyways, I think it is good advice to just pile some compost on top of the existing circles and remove some grass and just pile compost and mulch on top of whatever already exists and let nature do its job. Red wigglers are everywhere in my yard, so they probably help as well.