Nutrients — Bloom

Four different kinds of product sit side by side here and they do not do the same job: a bloom base feed, a PK charge, a bloom stimulator and a ripener. What separates them is mostly when you give them.

The base is one bottle per medium

This is the foundation and it will run a whole bloom on its own: CANNA Terra Flores, Hydro Flores A+B, Aqua Flores A+B and COGR Flores A+B, Plagron Terra Bloom and Alga Bloom, Hy-pro Epic Bloom Terra, Bio G Power Bloei Max, the organic Biocanna Bio Flores, and the two-part B1 and B2 from FloraFlex. Pick one, and pick it to match your medium.

PK is a charge, not a second base

A PK product goes in during the second half of bloom, for about two weeks, and then you stop. Atami Ata PK 13-14, CANNA PK 13/14, Plagron PK 13-14, Bio G Power PK 13+14 and Aptus Super-PK all do the same kind of work. Check your base line's feed chart first: many bloom feeds already cover part of the peak themselves, and stacking a full charge on top buys you burnt leaf edges rather than weight.

Stimulators work on flower set

A bloom stimulator acts on flower set itself, so it belongs early in bloom rather than at the end. Atami B'cuzz Bloom Stimulator and its coco version, C-Result C-Gold and No Mercy Supply Bloom Sensation fall in this group. Atami Blossom Builder comes as a liquid and as Tabzz, which mainly changes how you dose it.

Ripening at the end

The last group works in the weeks before harvest: Atami Ata Bloombastic, Ata XL and Rokzbastic, Plagron Green Sensation and Sugar Royal, Bio G Power Sugar Candy, No Mercy Supply Sweet Jane 2, and from FloraFlex Bulky B for early bloom and Full Tilt for late. Same rule as PK: one product from this row is enough.

Frequently asked questions

When do I give PK?
In the second half of bloom, and for no more than about two weeks. Starting earlier does little because the flowers are not there yet, and running it to harvest pushes the taste the wrong way.

Can I combine a PK charge with a bloom stimulator?
Yes, because they act at different times and on different things. What you do not do is stack two PK products or two stimulators, because then you are giving the same elements twice.

Does my base feed already contain PK?
Almost always some, because a bloom feed is phosphorus- and potassium-heavy by definition. How much is in the feed chart for your brand, and so is whether a separate PK charge is meant to sit alongside it.