Ninjadogma
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- Sep 27, 2024
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I'm of the opinion that it doesn't make enough of a difference to justify the loss in weight
and terp/resin production.
How do you flush soil? How do you account for plants in soil looking lush and green right
up until chop, with no sign of fading (senescence)? They are as nutrient laden as they can be.
Flushing is bro science that started in the hydro circles way back when imo. I say blast'em
until you chop them. Drying and curing is wayyy more important than flushing imo. Here's
from the web supporting this position:
Is Flushing Cannabis Before Harvest Necessary?
What “flushing” means:
Flushing typically means giving your plants only water (sometimes with enzymes or finishing agents) for the last 7–14 days before harvest. The belief is it removes excess nutrients and leads to smoother, better-tasting bud.
The Science:
- No credible peer-reviewed studies definitively prove that flushing improves taste, aroma, or cannabinoid content.
- Rx Green Technologies(a respected cannabis nutrient company) ran a blind test in 2020:
- They grew cannabis under controlled conditions, flushing for 0, 7, and 14 days.
- Result: No significant difference in taste, aroma, or smoothness based on chemical analysis or blind taste panels. In fact, the unflushed plants often scored higher in flavor and THC content.
Source: Rx Green Technologies Flushing Trial PDF
Bro Science Origins:
Flushing is rooted more in hydroponic culture and the idea of “salt buildup,” which can be a real issue in overfed or poorly managed systems. But in modern, dialed-in systems with proper EC control? Flushing is likely unnecessary.
TL;DR Summary:
Topic Science-Backed? Verdict Flushing before harvest Mostly bro science
Not necessary in clean systems Plants prefer organics They can't tell
NPK is NPK at the root level
You’re better off focusing on:
- Proper EC/pH control
- Finishing your plants strong
- Drying/curing correctly — this affects taste more than flushing ever will.
Never held back nutes at then end... well actually that's not true because I've done drought stress the last week to try and boost final resin production. I had been only running two phenos so it was easier to track, and I didn't notice a difference in resin production but it did seem to mellow out the taste in the jar about a month earlier than it normally would.