I am using gaia green and FFOF with terrific results. I add EWC to jump start the microbial life that is necessary to break down the granular organic amendments. Day 10 of flower so I cannot speak for the final result yet. Absolutely use the power Bloom during flower.
I start in small container straight ffof. Repot to a 1 gallon with 6 part ffof 1 part ewc 1 part perlite, with gaia all purpose 3 tbs per gallon. And then repot into 5 gallon final homes 6 part ffof, 1 part ewc, 1 part perlite, with 50/50 split power bloom and all purpose, because I flip to flower a week after repotting.
I imagine your mother wants to skip the transplanting as it can be a lot of work. IMO starting in the final pot size is fine as long as you are watering appropriately, applying water only as far as the leaves reach. She could amend the soil 3 tbs per gallon 70/30 all-purpose/powerbloom to start, with a large handful on non amended soil we're the seedling will start. And start top dressing 2 months later. Top dress every 3 weeks after that at 1 tbs per gallon of a mixture of all purpose and power bloom, the ratio is depending on if you're flowering or plant to veg longer
I water 5- 10 percent volume of the pot size everyday. So for my 5 gallon fabric pot I water 1/2 gallon everyday. But the plant is large, so for your mother she would water less at the beginning and gradually increase the amount.
View attachment 4843755View attachment 4843756View attachment 4843760View attachment 4843761these girls are day 10 of flower, I germinated the seeds January 1st. They seem extremely healthy. Use EWC to Jumpstart the microbial life