Cool RETRIX... calcium is super important!
and definitely an investment. Once you’ve made the solution with the ACV it is readily available to the plant yes? It wont reverse existing deficiency damage but it will halt it, so i can be applied remedialyl with a little success at least.
Can you link to the article about cannabis not liking much calcium during flower? This is in conflict with what I have understood which is that calcium is totally important during flower for many things, including the development of terpene profile. But sure everything has to be in balance. I am currently making up a 6/5/3 ratio blend of rock powders that gets added as a soil amendment (6 parts CaC02; 5 parts Soft Rock Phospahte; 3 parts gypsum). Cooked for a month in a living soil mix this will start to become available 2-3 weeks after the cook finishes. This year it’s for my veggie garden, but last year I used it in my cannabis soil and didnt have any cal issues at all. But yeah - not a quick fix! But easy to do in advance of a grow - and a little bit goes a long way, like 1/4-1/2 cup per sq. ft. I found this info when I was researching how to introduce high brix methods to my organic soil. The 6/5/3 mix is for a basic mineralised soil. I was so amazed and impressed at the difference in the quality of what I grew that I went ahead and started using Doc’s kit!
Sorry to ramble on! Just had my Saturday mornign wake and bake and I’ve been obsessive about calcium as well - so you got me all fired up!