Other garden factors
In the interest of acknowledging sound garden practices, it’s good to mention that I also double-dug the whole garden when I put it in, adding composted cow manure as I did. I never use those terrible wood mulches or mulch of any kind, except I allow the neighbor’s tree leaves to remain on the garden over the winter, to add nutrients and protect the soil and soil organisms.
I also spread compost from my own compost pile that I create with weeds, grass clippings, etc., over the garden in spring after I rake away the leaves from the autumn before. Just to let you know it isn’t *all* abracadabra. Some of it is these more ordinary kinds of garden magic. <3