hey friend, couldn't help but give you some alternatives: After getting burnt on alot of bagged soil and not wanting to pay shipping charges for promix or foxfarm, i have come up and researched some soil combinations for the grower who would rather do it all and control it all. So, Here we go: Some mixes are extrememly simple, while other are more complex. I have used at least 4 of these mixes for both mary jane and as an additive for my vegetable garden, all with success.
1st off- a simple combo of 60% organics potting mix (self made) 15% perlite, 10% horticulture sand, and 5% sphegam moss.
2nd mix- 30% worm castings, 30% vermiculite, 20% perlite, 20 % peat moss
3rd mix- 40% composted soil, 30% worm castings, 20% perlite, 10% guano ( I prefer a lower nitrogen guano, as i use BMO to keep all numbers in check)
4th mix- 1qt. perlite, 1qt vermiculite, 2 qts. worm castings, 1 qt. compost or organic potting soil, 1/4 cup high nitro bat guano 10-3-1, 1/2 cup dolomite lime powder, during flowering add 1 teaspoon horticluturegrade epsom salts per gallon of water, add 1 table spoon of horticulture grade sand, generally water every 3 days.
5th mix- 1/3 perlite, 1/3 peat moss,
1/3 compost or organic potting soil, a cup of worm castings, and a cup of guano.
You will still want to nute around the 4 week ( preferably organic like BMO) and start out with bigger pots, because i've noticed that my plants did not like getting transplanted at all. Could be coincidence though.
A helpful equation to use is : 2 parts moss, one part horticulture sand, one part perlite to each 4 gallons of soil...