Shogun PK Warrior 9/18 — Extended-Use Flowering Booster for Dense Growth
Best for: Growers wanting a concentrated PK supplement that works longer than standard 13/14 boosters, at a price that actually makes sense
Our thoughts
This is a genuinely different PK booster. The 9/18 ratio isn't just marketing—Shogun's research shows it delivers better potassium uptake without the phosphorus overload that kills micronutrient availability. More importantly, you use it for four weeks, not three days. That's proper value engineering.
Shogun PK Warrior 9/18 is a concentrated phosphorus and potassium flowering additive designed to extend peak reproductive growth through the final weeks of bloom. Unlike standard PK boosters that follow the industry-default 13/14 ratio, PK Warrior uses a 9/18 split backed by field trials proving it maximises potassium uptake whilst avoiding phosphorus overload. Run it from week 4 through to final flush—four solid weeks of yield support, not a panic-buy three days before harvest.
How it compares
Most PK boosters on the market use a 13/14 ratio and are applied for a short 3-week window. PK Warrior stands apart in two ways:
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Ratio science: The 9/18 formula is lower in phosphorus (which most bloom nutrients already contain heavily) and higher in potassium, which drives sugar production without triggering micronutrient lockout
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Application window: You use it for weeks 4–7 of flowering. Competitors demand 3 weeks max, meaning you're getting an extended growth window and better value per litre
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Cost per application: At 0.5ml per litre, PK Warrior costs roughly £0.01 per litre of solution—typically a quarter of the per-litre cost of competing PK boosters
Usage guidance
Standard application
Dilute at 0.5ml per litre of water and apply from week 4 through to week 7 of the flowering phase. If you're on a 9-week bloom cycle, start with 1ml/L in week 4, then drop to 0.5ml/L for weeks 5, 6, and 7.
Base nutrient adjustment
When adding PK Warrior, reduce your base nutrient strength by 20–50%. The overall nutrient requirement is lower in flower, and plants transpire more heavily, so they'll uptake more solution overall. You're concentrating what's already there.
Structural support
The potassium spike pushes serious flower density and weight. Support it with Shogun Silicon and Cal-Mag to keep stems from buckling under the load. If you're not adding structural products, you'll see the difference in stem strength.
Compatibility
Works alongside Fulvic acid and Cal-Mag. Do not use alongside Shogun Dragon Force. Compatible with soil, coco, and hydroponic systems.
Technical specifications
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NPK Ratio: 0 - 9 - 18
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Sulphur content: 6.8%
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Active ingredient: SmartZen Maximiser (Shogun proprietary additive)
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Dilution rate: 1ml/L week 1, then 0.5ml/L weeks 2–4 (or 0.5ml/L throughout weeks 4–7)
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Form: Liquid concentrate
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Available sizes: 250ml, 1L, 5L, 10L
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Storage: Cool, dry place. Keep above 7°C to prevent crystallisation
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pH range: 6.3–7.3
Who this is for
- Growers running soil, coco, or hydroponic systems who want a medium-agnostic flowering boost
- Budget growers looking for the lowest cost-per-application PK booster on the market
- Anyone frustrated with standard 13/14 boosters that demand a short, precise window—PK Warrior gives you breathing room
- Experienced growers who've tested competitor ratios and want to try the potassium-heavy approach
- First-time bloom booster users wanting a single product that covers the full mid-to-late flowering window
Our take
PK Warrior works because it's built on solid field research, not guesswork. The 9/18 ratio makes physiological sense—potassium drives sugar and essential oil production, phosphorus is already plentiful in most bloom nutrients, so there's no point wasting money pushing it further. And four weeks of application at 0.5ml/L is genuinely economical.
If you're after a flowering additive that doesn't demand military precision timing and costs pennies per application, worth picking up. Does exactly what it should from week 4 through to flush.
