[Ironwood]

For seedlings I mix:

1 part peat
1 part worm castings
1 part perlite

Also worm castings make a great compost tea. One cup of castings per 4 gallons water in a five gallon bucket of water bubbled for 24-48 hours. Magical elixer! You can cut it with water to use for a spray or just water it right in.

Edit;

Use an old sock to hold the castings while they brew in the bubbler.