Buddhas Tree PK 9-18 — Premium Flowering Booster with Weight-Based Ratio Precision
Best for: Serious growers wanting measurable yield increases and superior flower quality without the synthetic additives
Our thoughts
This is proper kit. The weight-based 9-18 elemental ratio is genuinely unique — competitors calculate by volume, which means their plants often miss the mark. Buddhas Tree nails it by weight, so you're feeding your plants exactly what they need, not a close-enough approximation. The fact it runs from week 3 through flush rather than a quick pulse at peak flowering shows they've thought this through. One growers keep coming back for.
Buddhas Tree PK 9-18 is a super-concentrated phosphorus and potassium flowering booster formulated to maximize flower quality and yield during the critical flowering stage. Unlike standard PK boosters that use volume-based ratios, this one calculates by weight, delivering the precise 9:18 elemental ratio proven to optimise flowering performance across most fruiting and flowering crop species. Developed in the UK by top-tier horticultural chemists, it's organic-derived, synthetic-free, and designed to work alongside any base nutrient in any growing medium.
How it compares
This sits in the premium specialist tier of PK flowering boosters, and the difference matters.
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Weight-based ratio — competitors calculate by volume, which often delivers the wrong elemental ratio. Buddhas Tree calculates by weight, so your plants get exactly 9 parts phosphorus to 18 parts potassium.
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Extended application window — most PK boosters pulse for a few days at peak flowering. This one runs week 3 through to flush, supporting sustained flower development and ripening.
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Organic formulation — no synthetics, fully EU food-grade compliant, which means you're building plant health, not just chasing numbers.
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Highly concentrated — small dosages mean the bottle lasts longer and cost-per-application is significantly lower than dilute competitors.
In real terms: you're paying for a precisely formulated product developed by someone who knows what they're doing, not a marketing story.
Usage guidance
Buddhas Tree PK 9-18 is straightforward to use across all growing setups, but timing and dosage matter.
When to use
Start from week 3 of flowering through to the flush phase. This extended window — longer than most boosters — supports flower density, quality, and final ripening.
Hydroponic systems (soil-less media)
Dose at 0.25–0.5ml per litre of nutrient solution. The highly soluble formula won't block pipework or emitters, so it's clean in automated systems and drip setups.
Soil growing
Use 0.3–0.6ml per litre of water. Soil buffers nutrients differently, so the slightly higher rate accounts for that.
Coco medium
Works cleanly in coco. Use the hydroponic dosage range (0.25–0.5ml/L) as coco behaves similarly to hydro in terms of nutrient availability.
Compatibility
Use with any brand of base nutrient — this isn't tied to a specific nutrient line. Don't combine with other PK boosters; Buddhas Tree is designed as your PK solution for the entire flowering window.
How it works
The formula strengthens root enzymes and increases nutrient absorption efficiency, while the elevated phosphorus and potassium boost natural essential oil and sugar production. Stronger roots mean healthier plants and better stress resilience — you're building quality, not just pushing numbers.
Technical specifications
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Type: Super-concentrated liquid flowering booster
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Elemental ratio: Phosphorus 9 : Potassium 18 (calculated by weight)
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Formulation: Organic-derived, synthetic-free, EU food-grade compliant
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Solubility: Fully soluble, will not block pipework or irrigation systems
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Available sizes: 100ml, 250ml, 1 litre, 5 litre
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Dosage (hydroponics/coco): 0.25–0.5ml per litre
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Dosage (soil): 0.3–0.6ml per litre
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Application window: Week 3 of flowering through to flush
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Compatibility: Works with all base nutrients, all growing media, all hydroponic systems
Who this is for
- Growers serious about maximizing flower density and quality during the flowering stage
- Hydroponics enthusiasts wanting a precision additive that actually delivers the claimed ratio
- Anyone running soil or coco who wants to step up flower performance without synthetics
- Growers tired of PK boosters that promise one thing and deliver another
- Experienced cultivators who understand the value of precise nutrient ratios and extended support through flowering
Not a beginner product — this is for growers who know what they're doing and want the edge. That said, if you're ready to move beyond generic boosters, this is worth picking up.
Our take
Buddhas Tree PK 9-18 does what it claims to do. The weight-based 9:18 ratio is genuinely unique, the formulation is sound, and the extended application window from week 3 through flush is smarter than the quick-pulse approach most competitors use. Growers report measurable yield increases and noticeably stronger flower quality — and the feedback consistently mentions much more pronounced natural plant character (what some would call improved aromatic output).
This is proper kit at a price that reflects the work that's gone into it. If you're ready to dial in your flowering stage, worth picking up while stock lasts. Does exactly what it should, week after week.
