Asked by maxgxlhi ·September 18, 2018 ·25.8k readers

Ffj use in cannabis

Drake, I noticed you answered about using knf fruit for flowering in cannabis. Were you speaking of using wca only or a wca/fpj combo or a wca/ffj combo? Or should ffj only be used for fruiting trees/shrubs? I also noticed in your calculator that I bought : ) that there is no ffj. Is there a reason for this?

fpj cannabis knf-fruit wca ffj

From the KNF library

From the KNF library Drafted by Claude from Office Hours and the books · Sep 2026 · 4 sources

Drake's library holds Cho's stage chart, and it speaks to your combo question.

The chart assigns FPJ to the early stages and FFJ to the last two (Cho's Solutions, p. 12). Those last two are fruit and reproductive, then enhanced ripening (Cho's Solutions, p. 12). The chart shows no stage where both run (Cho's Solutions, p. 12). It also says to make FPJ from unripe fruits (Cho's Solutions, p. 12).

In those same last two stages, the chart adds WCA and drops FPJ (Cho's Solutions, p. 12). Cho says WCA works in the cross-over from vegetative to reproductive growth (Cho, Recipe, p. 62). So the chart pairs WCA with FFJ late, not FPJ.

The KNF Demystified mix chart lists FFJ in its 4-gallon mixes (KNF Demystified, p. 24). One office-hours answer says Hope ferments flower trimmings and leaf biomass to match the plant's needs at each stage (Office Hours Ep. 15, 37:09).

The library does not say why your calculator has no FFJ. It does not say how Drake uses FFJ on cannabis, or whether he limits it to fruiting trees and shrubs.

Sources

37:09 Office Hours Ep. 15 (Jan 2022) — Cannabis KNF, IMO4 Winter Storage, FAA Without IMO4 · “Hope ferments flower trimmings and leaf biomass into fermented plant juice to match the plant's nutrient needs at each growth stage.”
p. 24 KNF Demystified · “fpj 1oz 1/2oz ffj 1/2oz 1oz brv”
p. 62 Cho, Recipe · “WCA is very effective in the cross-over period when the growth of crop changes from vegetative to reproductive growth.”
p. 12 Cho's Solutions · “FPJ nutrition 500 8mL 8mL 8mL - - FFJ nutrition 500 - - - 8mL 8mL LAB helpers 1000”

1 more answer

nhansink · Nov 28, 2018

I’m no expert but it’s my understanding as from Chris trump that you use WCAP for transitional phase with and fpj high in phosphoric acid or flowering hormones like flower fpj or unripe green fruit, as the plant gets further along into flower and fruit you transition to using WCA and towards the end you use a ripe “ffj” full of ripening hormones and mature plant sugars along with WCA to really harden and finish off your fruit or bud, that’s how it is to my understanding