... and maybe throw some worms in my garden
There are two basic flaws in that approach. 1. You must ensure that you purchase the correct worm for the environment you'd like to introduce them to; there are two basic
types of worms, The Red Wiggler, which primarily lives in leaf litter and is the perferred type for compost/vermicomposting. And 2. the earthworm that lives in the ground, some call Nightcrawler. They look basically the same, but they do require two completly different environments.
From what I've heard, most bait shops sell Red Wigglers, so if you buy them and throw in your garden, they'll die, unless you got tons of mulch, especially leaf-type mulch, but most gardens don't have this. Secondly, if they are the ground burrowing-type earthworms, you have to ask yourself why you don't already have them? I know why I don't, because the soil is not healthy enough to support them; if I were to buy earthworms and place in my garden, they'd just die. The soil is just too sandy and devoid of organic matter.
That is why I'm trying to change my soil so that it can support earthworms. I've been pretty sucessful under my trees with all the mulching I've done, now I've got healthy populations of both the red wigglers and earthworms; I also got tons in my compost.
However, my garden areas are tougher areas to develop, since they've been sun-beaten for years, as opposed to my mulched/compost areas, which have been shaded and been the recipient of all the various nutrients that fall from the trees. But what's different now is that I heavily mulch these areas, whereas before I'd mow in these areas which would put a heavy strain on the soil life, including worms. I never bought a single worm, I just made a habitat and they came in large number, as well as all the other soil organisms.
BTW, here's some more benefits of the worm (copied from here: https://www.bwcnfarms.com/index.php?pr=Healthy_Living_Soil )
Why are Earthworms Important?
Earth worms are not only the most recognizable of all the animals in the soil food web, but also one of the most important to gardening and farming. According to a study done by Cornell University (2007), Ã¢â‚¬Å“Large macroscopic organisms such as earthwormsÃ¢â‚¬Â¦are important for improving aggregation, soil drainage, and aeration due to their burrowing/-channeling nature.Ã¢â‚¬