Hi guys, I am new here to afn, but have been using vermiculture (worms) in my garden style for auto's very successfully for years. This is a great topic. I am a full blown worm geek, I raise several species to make my own vermicompost to use in soil mixes, and top dresses. I grow autos in10 gal no tills, with solid worm populations, and it works great.
Here are some tips/ info I have learned over the years, when using worms in containers.
The real key is in adding lots of mulch on top and to keep feeding mulch throughout the process. Indoors I use a lot of leaves from my houseplants/ spice plants and canna fan leaves.
A couple things I have found to be key in a soil mix are items that break down at different rates over times, but do break down. Pine bark, in a size labeled 'Small bark nuggets' or 'fines' feeds the soil for quite a while, holds extra moisture, and helps drainage. The worms love bark as it is breaking down. I add rice hulls, they breakdown faster, ie are available sooner than the bark. Rice hulls contain a ton of silica, and also help with drainage prior to being broken down. The worms love this too. It is important to use a higher than normal percent of drainage media (perlite or pumice or whatever) if you do this long term. In normal container gardening I would use at least 33% perlite. In the method I describe, I use at least 40%, often 45%. It drains almost too well in the beginning, but will remain to drain well throughout the long term as things are broken down. This is the trick to keep the soil from getting to muddy over time, especially at the bottom of the container. I also feel the addition of fine rock dust is crucial. The worms use this as grit in their gizzard. The extra win behind this, is that your rock dust gets 'weathered' going thru the worm, and nutrients locked up in the rock dust become available much quicker. The rock dust will also help bind the soil. This too helps eliminate the 'muddy' in the bottom, problem. I use glacier rock dust, I get it free. Greensand or basalt dust work great too.
Most folks believe that you need at least 20 gallon containers to do no till, it can be done in tens, as I do, but requires a few tricks. For the record, I usually run three seed to finish cycles in my containers, then take a few months off for the summer. Then the pots are put back in action, unless I think I have learned something that makes me want to change my soil mix. Even if I change my mix, I still get 3 full cycles with doing very little to my soil.
hope I didn't rattle on too much for ya
cheers
os