Description
House and Garden Nitrogen (N27%) 250ml is a highly concentrated pure nitrogen supplement from House and Garden Nutrients, providing a precise and immediately plant-available nitrogen boost for correcting deficiencies or adjusting the nitrogen level in your nutrient solution without altering the balance of other elements. We have been recommending House and Garden nutrient additives to UK growers since 2017 as pharmaceutical-quality, precision-formulated products that give professional growers the tools to fine-tune their nutrition programme with the accuracy that high-performance growing demands.
When and Why to Use a Pure Nitrogen Supplement
Nitrogen is the primary driver of vegetative growth — it is a core component of chlorophyll, amino acids, and nucleic acids, making it fundamental to every aspect of plant growth and metabolism. Nitrogen deficiency shows as progressive yellowing from the oldest leaves upward, accompanied by reduced growth rate and thin, pale new growth. In a two-part nutrient system, adjusting nitrogen independently of other elements requires a dedicated nitrogen supplement rather than increasing the overall nutrient dose, which would raise EC and potentially overfeed other elements. House and Garden Nitrogen at 27% concentration is a precision instrument for this purpose — small additions (typically 0.1–0.3 ml per litre) allow you to raise the nitrogen level in your solution precisely without disturbing the phosphorus, potassium, or micronutrient balance. This level of precision is particularly useful in diagnostic feeding situations, when transitioning between growth stages with different N requirements, or when running soft water that naturally provides less nitrogen baseline than hard water.
How to Use House and Garden Nitrogen N27%
Add in small increments — start with 0.1 ml per litre, mix thoroughly, then check EC and pH before assessing plant response over 2–3 days. Add further doses incrementally if deficiency symptoms persist rather than making large single additions. Use a calibrated EC meter before and after addition to quantify the nitrogen increase. The 27% concentration means very small volumes produce significant nitrogen additions — use a precise measuring syringe rather than a measuring cup for accurate dosing at these small volumes. Compatible with all House and Garden base nutrients and growing media.
Pair House and Garden Nitrogen with the complete House and Garden base nutrient programme and CalMag for precise element-by-element nutrition management. Browse our full House and Garden nutrient and additive range for professional-grade Dutch growing chemistry.
Browse the full range: Explore our complete New Products range at The Horticulture Company. Also in this range: IONIC CALMAG PRO, UGRO XL BASIC 70LITRE, EXHALE CO2 BAG, PLANT !T YOYO (PACK OF 8).


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