In early flower during the stretch more P is needed but so is a lot of everything as the plants feed up to 4X as much during that growth spurt. After the stretch more K is needed than P and that’s where most P/K supplements get it wrong. Tomatoes like higher P but pot not so much and too much P is what gives that ‘chem’ taste to the buds.
I have the Greenleaf Pk and just the K too so add a touch of the PK when I start flowering as Big Bud is 0-15-35, with 10% S so a little low on P for the stretch but later I feed Lucas Formula style and will add a little K alone the last 3 weeks or so along with Epsom Salts for the extra Mg and S that is basically AN OverDrive and a lot cheaper.
