I grow in soil, and add worms (1 earthworm/dew worm + 3 red wigglers/trout worms per gallon) to my soil. It works wonders.

I also keep a worm bucket in the kitchen (it doesn't stink) (usually). Sort of like a mulch pile in a bucket. I flood this once a week to get 2L or so of strong worm tea. The rest of the week, I simply collect the drippings (usually between 20mL - 100mL) and mix it with my watering water.

To make a worm bucket, you'll need the same requirements as for a plant: dirt & drainage. I recommend a 5 gal bucket (with lid!) with drainage holes. Put 2" - 4" of dirt in it. Add worms. Add garbage. Water till it starts coming out. Tumble once a day. Flood once a week. And that's all!

I started with a dozen earthword & 2 dozen red wigglers, don't know how many are in there now. Then I simply threw in some garbage. All my vegetable garbage goes in there: executed male cannabis plants, potato peels, tea bags, coffee grounds, onion skins... ANYTHING vegetable. No meats or processed foods. Well, bugs when I clean the light fixtures.

When I flood it, I set the bucket inside another bucket, and simply pour in 2L of water at full force. No wimpy sprinkle, just whoosh. Then I pull the worm bucket out of the other bucket. Just like bubble bags for hash, but with worms. The catch bucket is full of brown liquid which the plants find so yummy! Be sure to check pH if acidic fruits are thrown in!