jay there's this soil mix called m3 or medical marijuana mix and it's supposed to be a soil whch has all the nutes you'd need during your grow. They claim you just need to add water..
I copied this from their facebook:
M3 Medical Marihuana Mix – Patented and Award Winning Organic Grow Medium
As seen in High Times!
M3 Medical Marihuana Mix was made to simplify the organic growing process. M3 Mix is all you need from start to finish! It’s patented “Just Add Water” formula simplifies the complicated and sometimes frustrating medical marihuana grow process. It also creates an easy way to grow your medicine orga...nically!
Instead of buying, measuring, and mixing all of your grow mediums and nutrients separately, the makers of M3 Mix have done all of the work for you! With a patented mix of Seabird Guano's as the guano base, the M3 Mix is fortified with Green-sand, Blood and Bone Meal, and Rock Phosphates to give a complete meal for your fruiting or flowering plant. The Blood-Meal and Bone-Meal are added as a powder to give the plan instant nitrogen for the vegetative process, and the guano's and rock phosphates are crushed from pellets into tiny pebbles to give the mix its time-released Phosphorus and Potash. Peat Moss is proving to be the number one organic grow medium due to its high porosity, natural mycorrhizal fungus (which feeds on the composted Sphagnum we add), and its superiority to wood based grow mediums. Whether you’re a new grower, or have been growing for years, M3 Mix is an obvious choice due to its quality, simplicity, and environmentally conscious organic design.
RECOMMENDED USE:
Vegetation Stage
18 to 24 hour light cycle
Flowering Stage
Light cycle 12 hours on, 12 hours off
Recommended pH
Roughly between 5.8 – 6.8 pH
Always check your water regularly!
For even bigger better buds add 1 tablespoon of Papa’s Perfect Poop in 1 gallon of water during early stages of flowering. Organic supplements may be added if desired. Supplements may vary depending on strain.
INGREDIENTS:
Composed Sphagnum
Canadian Peat
Vermiculite
Fossilized Seabird Guanos
Bone Meal
Pock Phosphate
Green Sand
Perlite
Blood Meal
Lime
PRIMARY NUTRIENTS:
Total Nitrogen (N) 15%
Available Phosphate (P205) 33%
Soluble Potash (K20) 38%
Fertilizer Grade 15-33-38
Do not use this product with chlorinated or fluoridated water. Use a reverse osmosis system if possible.
SIZE:
Two (2) Cubic Feet (15 Pounds) – Fills 12 #2 Pots
Seeds and plants NOT included! Please read our Warnings.
Endorsed by High-Times Senior Cultivation Editor Danny Danko and Nico Escondido, The Award-Winning* Pro-Grow M3 Medical Marihuana Mix (also know as Michigan Made Mix) is your best and easiest way to grow organically!
"Try Michigan's Finest to boost your growth and harvest a bounty of buds!"
~Danny Danko, High Times Senior Cultivation Editor
As seen in the December 2011 Edition of High Times
So either way your plants will need nutrients to grow and thrive, regardless of strain.. although genetics do play a big role