This is the nutrients and schedule I use growing cannabis in cheap generic potting soil.

Every plant is different, and some need more, some need less. I also learn as I grow and change it up as I do. I'll post updates as I do.

Germination
Water only.

Nitro
Once 2nd or 3rd node grows, I switch to 10% fish water, 90% filtered water.



After topping, and the branches form nice robust looking growths, I switch to about 25% fish water, 75% filtered water.

At preflower I ramp up closer to 33% fish water, and end of stretch gets a single 50% fish water, then I ramp it back down to 0 by end of week 6 flower.

Potassium
I boil 2 banana peels in a half gallon of water. Remove peels and cool off, then mix with a half gallon of filtered water, and add a tablespoon of molasses or honey.

I start feeding them this when I see flowers everywhere, and stop at week 6.

Phosphorus/Calcium/Magnesium
I'm trying something new and top dressing 1 tablespoon of bone meal with 1 tablespoon of Epsom salt, once cotyledons turn yellow. I'll add a second tablespoon of just bone meal at flower switch.

I used to mix 1 tablespoon of Epsom salt in its own gallon, using it as foliar spray, and pouring a healthy dose in my nitro gallon, but I think top dressing will be less work.

Quantity
They get about a cup of appropriate nutrient water every day, or every other day. It's largely dictated by the soil of the plant. I don't feed to run off often because I don't like cleaning my drip pans that much; however, I do feed to run off at least once in veg and once in flower to make sure nutrients are reaching all nooks and crannies in the pot.

Dry
Anytime I feed to run off, or flush, it gets a day or 2 with no water or feed to dry out.

I check the soils in the morning, while I wake n bake. If they are dry, they get fed, if moist, not getting fed until next morning.

Flush
Once a week they get a regular water. At switch I water to run off. At week 4 I water to run off.

I'm not trying to remove nutrients. I'm trying to push them down and around. To disturb idle nutrients and positioning them anywhere in pot besides where they are at.