Hey
@ReservoirDog , have you gotten all the way through flower using just your amended Supercastings?
Whup, sorry for the delay. The short answer is Yes... with a couple caveats up front. All three were mini-SIP plants, staggered in time and size, in 2-litre, 4-litre and 8-litre SIPs. They produced very well for their size, the stuff was wicked strong, tasted great, but at the time I didn't have the amounts on hand that I figured I'd need, in order to do larger or more plants.
However, later on I did run two of my large outdoor tomato SIPs on purely these castings this season and had the best harvest ever with plants comparable to the MegaCrop fert'd tomato SIPs.
I also have two full size plants vegging in one of my 27-gallon tote-SIPs, currently (see below). I'm flowering them any day now so I'll update via this thread. They have done very well thus far; they are ''rehabbed'' - as seedlings had their main stems broken. They showed a certain amount of chutzpah, thus seducing me into up-potting them into a castings-only SIP system.
Kinda want the small one a little bigger but losing patience. I keep the plastic on there as mulch so microbes are at surface ready for me to top dress more castings. Reservoir has a bubbler and receives only 7pH tap water, chemically dechlorinated. Voila:
The tomato example I think is pertinent to the cannabis question, and I can assure you there was no bottom-end rot, and as I mentioned, the harvest this year was, and still is, epic.
These were 27-gallon to 40-gallon SIPs for the veggies. Mix for SIPs big and small has been 1 part Peat, 1 part Custom-Castings, and 1 part Perlite. My Peat/perlite was a lime and silicone buffered commercial product, to which I added enough perlite to increase ratio to 50/50, before mixing in the castings.
The castings I make are totally customized with no random ingredients provided merely because they are handy, like kitchen compost.
This was approached purely as an experiment, one that I gained a lot of confidence in early on, and thus expanded as far as energy and resources allowed, but it's still an experiment and I prevent myself from feeding them scraps easily at hand that would make my life easier and allow me to expand production further.
That's not to say one could not come by all of these ingredients efficiently, cheaply, and in large volumes, one definitely could, it's merely to say that
I haven't done so and so this limits my production of these special castings.
Worms are fed everything from accumulator plants like comfrey, nettles, willow and bamboo, to organic micro-nutrient additions like locally harvested seaweeds, and pest management ingredients like neam cake and crab shells. I do limit myself to whatever I can grow at home or is locally available in such great supply as to be free or close to it. My exception to this rule thus far is fungi and microbes which I buy commercially and then culture in overseeded 10x20 trays, on the roots of wheat, corn and legumes, then add these fresh roots to the worm feed. Everything is mixed together in a blender and fed at apple sauce consistency or sometimes in frozen cubes.
My plans are to trap and isolate local microbes and mycos to replace my commercial ones, but only for the challenge and education.
All three cannabis plants I've brought to flower so far and harvested- that were using the castings as 'sole' fertilizer grew remarkably similar to a synthetic all in one I use, MegaCrop. Surprisingly, leaves did not fade very much, indeed they kinda looked like an organic grow using a 5-5-5 (heavily) all the way through. I make sure a lot of phosphorus solubizing microbes are in the mix and mycorrhizae, as well as some Nitrogen collectors too. By volume it’s about 50 % N, I estimate, from heavy comfrey and nettle use. No obvious deficiencies have arisen as yet.
Now I’m wondering what would happen if you dried the castings, if they would have a significantly longer shelf life and how much of the microbial life could go dormant and then come back with a watering when ready to use. See what happens when I can’t get Geo Flora? I try to invent my own! I’ve got some castings set aside for the drying experiment (just curious), I’ll keep you posted.
Also - the two I have vegging I’ll be sure to document flower on this thread. I know it’ll work, my only fears are whether some reg seeds slipped into my rotation because I just had another plant turn out to be a male when I was working with seeds marked Fem. D’oh!
I know all about cooking supersoils, but you see, this is a rabbit hole, and I’ve fallen and can’t get up! Go Lassie! Go get Timmy!
Green peppers love the castings too: