CANinBIZ...... Tried, True, Cheap & Effective -> 50 percent well aged compost (bagged is OK), 30 percent peat moss or 30 percent well rinsed coco coir, 10 percent perlite, 10 percent worm castings.
.
Positives : Cheap to mix up, seedlings can be transplanted into it with no chance of burn. Will carry Mary for two weeks with nothing but water. All ingredients available at Home Depot, Lowes, Wal-mart....etc....
.
Negatives : requires 15 minutes of your time to mix it up...... that's work to some people (to me that's outdoor therapy).....
.
Start Low, Build as you Go.......
.
Then later, feed Mary some wholesum all Organic Fert Teas.......
.
See thread - Makin Tea is EZ & Cheap in the Organics Threads..... here is a link :
.
Making Tea - is EZ.... & Cheap !
.
Hope this helps.... simple is good.....
.
.