Description
Buddha’s Tree PK 9-18 is a premium phosphorus and potassium bloom booster from Buddha’s Tree — a UK nutrient brand built around the specific requirements of the final flowering phase. The 9-18 formulation delivers phosphorus and potassium in a precisely calibrated ratio that has been developed through extensive growing trials to produce the most effective bloom-phase mineral nutrition available in this format. PK 9-18 is the foundation of the Buddha’s Tree bloom programme and one of the most popular late-flowering boosters among serious UK growers.
The Significance of the 9-18 Ratio
The ratio of phosphorus to potassium in a bloom booster is not arbitrary. Different ratios produce different physiological effects in flowering plants. High-phosphorus ratios stimulate root activity and energy transfer reactions. High-potassium ratios support water regulation, enzyme activation, and the accumulation of secondary metabolites. The 9-18 ratio in Buddha’s Tree PK 9-18 prioritises potassium over phosphorus — a formulation philosophy based on the observation that potassium demand in peak flowering exceeds phosphorus demand in most crop situations, and that many standard bloom boosters undersupply potassium relative to what truly peak-performing plants require. This formulation approach is backed by Buddha’s Tree’s practical growing research and has been validated by the consistently positive results reported by growers using it across a wide range of growing styles and varieties. At The Horticulture Company, Buddha’s Tree products have been strong sellers since we added the range to our stock. UK growers have responded well to the brand’s practical, results-focused approach to product development.
When and How to Use PK 9-18
Introduce Buddha’s Tree PK 9-18 from weeks three to four of flowering, once bud sites are clearly established. Continue through to two weeks before your planned harvest date, then flush with clean water. Use at 0.5–1ml per litre alongside your base nutrient. Always check combined EC and pH-adjust before feeding. Compatible with all base nutrients and growing media.





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