Down the rabbit hole for fertilizers

[Ray]

Fertilizer is important, but the demand is extremely low and the formula almost doesn’t matter.

For any plant to add one pound of mass, it must consume and process only 5 grams - roughly a teaspoon - of NPK and 200 pounds of water. The plants you listed probably take at least 3 or 4 years to gain a pound of tissue.

Nitrogen is the important element to focus on, and roughly 100 ppm N applied weekly appears to be the sweet spot. With any fertilizer, divide 8 by the %N in the formula; the result is teaspoons per gallon for weekly doses at that rate, with room for rounding.

For example, a 30-10-10 would be 8/30=0.2666, so a quarter teaspoon per gallon is fine. The K-Lite Louis mentioned is a 12-1-1. 8/12=0.62, so 1/2 tsp/gal is good for that formula.

If you use pure water, you need to add Ca and Mg, as Roberta mentioned., beyond that, changing formulas has absolutely no benefit to the plants.

Kelp products may-, or may not be fertilizers. Most are, but the Kelpak Louis mentioned is a biostimulant that enhances nutrient uptake and significantly improves roots, growth, and flowering.