I put manure and earthworms in my houseplants pots when I put them
outside Memorial Day. The compost is done and mixed with existing soil
by mid september when I take them inside.

All my houseplants have worms in them because I used soil and compost from the
garden to plant my houseplants... the stuff I put them in is better then
storebought and since it's free it's cheaper..... my plants do very well.
Colleen
Zone 5 CT