"Swings" comment about building worm compost boxes brought back memories.
My father was an avid fisherman.
A low cost source of worms was a must.
His solution was to build a worm compost pile by adding just coffee grounds to the clay soil.
Took a couple of years, but the combination of worms and coffee grounds turned that clay sub soil into sandy loam.
BTW, no need to dig for worms.
A couple of metal rods stuck into the ground and a source of 120 VAC would "tickle" the worms right out of the ground.
Memories.
Lew