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IMHO castings are best used in a mix not as a substitute for a good substrate like peat or coco choir that will keeps it's stucture and work as an exchange site.
Eventually the castings will create a mud as it is very fine and this is not ideal for a plant like MJ that requires alot oxygen to the rootzone.
You could cut it with perlite (50%) to chunk the mix but in reality worm castingss are a great additive because they add humics and beneficial bacteria to the mix but I've never seen convincing results to it being a good backbone to a poting mix.
PS you can't burn plants with worm castings ever in any concentration.
pure castings gets kind of goopy when wet and by itself, if your going to use straight castings mix with perlite, but honestly just mix it into your soil mix and all the other things your going to add.
ceceharpo-
All plants will need food or N-P-K. Worm castings alone will not provide enough food to get the most out of your grow. And, you need a balance of N-P-K as well. A good ratio to use for N-P-K is 3-1-2 for vegging plants and 1-3-2 for flowering.
Let me know if you need any organic nute recipes and I can hook ya up.
Burn1
LC’s Soiless Mix #1:
5 parts Canadian Spaghnam Peat or Coir or Pro-Moss
3 parts perlite
2 parts wormcastings or mushroom compost or home made compost
Powdered dolomite lime @ 2 tablespoons per gallon or 1 cup per cubic foot of the soiless mix.
...Check the link in my sig line below for cheap earthworm castings. Free shipping to the eastern USA.
Or, if you use Pro Mix or Sunshine Mix...
LC's Soiless Mix #2:
6 parts Pro Mix BX or HP / Sunshine Mix (any flavor from #1 up)
2 parts perlite
2 parts earthworm castings
Powdered dolomite lime @ 2 tablespoons per gallon or 1 cup per cubic foot of the soiless mix.
If you use a 3 qt. saucepan as “parts” in the amounts given above, it equals about 1 cu. ft. of soiless mix and you can just dump in a cup of powdered dolomite lime.
---Now, using either one of the mixes above, use one of the recipes below...
RECIPE #1
If you want to use organic nutes like blood, bone and kelp...
Dry Ferts:
1 tablespoon blood meal per gallon or 1/2 cup per cubic foot of soil mix
2 tablespoons bone meal per gallon or 1 cup per cubic foot of soil mix
1-tablespoon kelp meal per gallon or 1/2 cup per cubic foot of soil mix or Maxicrop 1-0-4 powdered kelp extract as directed
1 tablespoon per gallon or 1/2 cup per cubic foot of Jersey Greensand to supplement the K (potasium) in the Kelp Meal and seaweed extract.
Mix all the dry ferts into the soiless mix well and wet it, but don't soak it with Liquid Karma and water @ 1 tbs./gal. Stir and mix it a few times a week for a week or two so the bacteria can get oxygen and break down the bone meal and make it available. And don't let the mix dry out, keep it moist and add water as needed. It'll also have time to get the humic acids in the Liquid Karma going and the dolomite lime will be better able to adjust the pH of a peat based mixture too.
RECIPE #2
If you want to use guano in your soil mix...
Bongaloids guano mix
1/3C hi N guano per gallon
1/2C hi Phos guano per gallon
1TBS Jersey greensand per gallon
1TBS Kelp meal per gallon
RECIPE #3 (My favorite)
If you want to use guano tea and kelp...
Guano Tea and Kelp:
Seedlings less than 1 month old nute tea mix-
5 tbs. Black Strap Molasses
1-cup earthworm castings/5 gallons of water every 3rd watering
Veg mix-
1/3 cup Peruvian Seabird Guano (PSG)
1/3 cup High N Bat Guano (Mexican)
1/3 cup Earth Worm Castings (EWC)
5 tsp. Maxicrop 1-0-4 powdered kelp extract
5 tbs. Liquid Karma
5 tbs. Black Strap Molasses
@ 1-cup mix/5 gallons of water every 3rd watering.
Flowering nute tea mix:
2/3 cup Peruvian Seabird Guano
2/3 cup Earth Worm Castings
2/3 cup High P Guano (Indonesian or Jamaican)
5 tbs. Maxicrop 1-0-4 powdered kelp extract
5 tbs. Black Strap Molasses
@ 2 cups/5 gallons of water EVERY watering.
You can use queen size knee high nylon stockings for tea bags. 3 pair for a dollar at the dollar store. Tell 'em you use them for paint strainers. Put the recommended tea in the stocking, tie a loop knot in it and hang it in your tea bucket. The tea should look like a mud puddle. Agitate the bag in the water vigorously. An aquarium pump and air stone will dissolve oxygen into the solution and keep the good bacteria (microherd) alive and thriving. Let it bubble a day or two before you use it. If you find you are making too much tea and having to throw it out, use 2 1/2 gallons of water and cut the nute amount by half.
RECIPE #4
Three Little Birds Method
40 gallons used soil
4 cups alfalfa meal
4 cups bone meal
4 cups kelp meal
4 cups powdered dolomite lime
30 pound bag of earthworm castings . . .
That’s the basic recipe . . .
However we also like to use
4 cups of Greensand
4 cups of Rock Phosphate
4 cups of diatomaceous earth
RECIPE #5
Fish and Seaweed
For veg growth…
1 capful 5-1-1 Fish Emulsion
1 capful 0-0-1 Maxicrop liquid
1 gallon H2O
RECIPE #6
And finally Pure Blend Pro...
Pure Blend Pro veg formula for hydro/soil and Pure Blend Pro flower formula for Soil. Simply use as directed on the label. It's a stand-alone fertilizer. That means, everything you need is already in there so don't let the guy at the hydro store try to sell you something more.