Individual Fertilisers

Individual fertilisers

One nutrient at a time, precisely

Single-ingredient fertilisers let you build a precise feeding programme by supplying one specific nutrient at a time: nitrogen, phosphorus, potassium, calcium, magnesium, sulphur or trace elements. This is the place to find a straight high nitrogen, high potash or high phosphorus fertiliser when you need to target one nutrient, follow a soil test recommendation, or build your own custom blend without adding what your soil already has plenty of. Every product in this collection is made with organic ingredients and supplied in compostable packaging where format allows.

What's in the range

  • Yorkshire polyhalite: a four-in-one mineral fertiliser mined from the Boulby Mine, the world's only commercial polyhalite operation. Supplies potassium, calcium, magnesium and sulphur in a single sulphate-based crystal with virtually no chloride.
  • Sulphate of potash: 50% potassium oxide for fruiting and flowering crops sensitive to chloride.
  • Phosphorus meals: both micronised rock phosphate at 31% phosphorus and a plant-based phosphorus meal at 15% phosphorus, a vegan alternative to bone meal.
  • Nitrogen Extract: 12% N plant-based granular feed for lawns, leafy crops and vegetative growth.
  • Alfalfa pellets: 2.5-0.3-2 with naturally occurring triacontanol for vigour.
  • Seaweed powder: 100% soluble cold-water kelp for trace elements and natural plant hormones.
  • Insect frass: chitin-rich soil amendment that supports plant resilience.
  • Micronised solution-grade minerals: Micro-K (potassium), Micro-Mag (magnesium), Cal-Mino (amino-chelated calcium) and Micro-Amino (chelated trace elements) for fast soluble feeding.
  • Organic PK 0-5-5: phosphorus, potassium, 15% calcium and a full micro-nutrient profile in one bag.

How to choose

If you've had your soil tested, individual fertilisers are the precise way to follow the recommendations. If you're building a custom blend, mix and match to suit your crops and growing stage. If you want fast soluble feeding, choose the micronised solution-grade range. For slow-release granular feeding, choose polyhalite, alfalfa or the meals. Application rates are on each product page.

Working out how much to buy? Try the fertiliser calculator. New to polyhalite? Read our guide.

Individual fertilisers: common questions

Both supply potassium without chloride. Polyhalite also delivers calcium, magnesium and sulphur in the same granule. Sulphate of potash is more concentrated potassium (50%) but supplies only K and S.
Yes. All single-ingredient fertilisers in this collection are suitable for no-dig, living soil and regenerative systems. Most are best applied as a top-dress and watered in.
Most products in this range are vegan: minerals (polyhalite, sulphate of potash, rock phosphate, micronised K, Mg and trace elements) and plant-based meals (alfalfa, seaweed, plant-derived nitrogen and phosphorus meals). The exception is the insect frass, which is vegetarian. None of the products in this range contain slaughterhouse by-products.
Dissolve in water and apply as a soil drench or, where suitable, a foliar spray. Each product label specifies the dilution rate.
Fruiting and flowering crops that need potassium without chloride benefit most: tomatoes, potatoes, soft fruit, roses and brassicas. Because polyhalite also supplies calcium, magnesium and sulphur, it suits any crop where you want all four nutrients from a single application.