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Welcome to the new Fargro website: retail and trade, now in one place.

Retail Customers call 01903 258200 • Trade Customers call 01903 726100.

Professional horticultural supplies for home and trade.

Trade and retail welcome. Expert advice and UK-wide delivery

Trusted by gardeners and growers for over 80 years

FAQ's

1. Product
What is PHOSTER and what does it do?

PHOSTER is a concentrated phosphite biostimulant that stimulates lateral root development, improves water and nutrient use efficiency, and supports plant resilience - it is not a phosphate fertiliser.

What is the difference between phosphite and phosphate?

Phosphate (P₂O₅) is an essential macronutrient the plant takes up and uses directly; phosphite (PO₃) is a smaller molecule that acts as a biostimulant, triggering physiological responses rather than providing direct nutrition.

What does PHOSTER contain?

PHOSTER is a concentrated formulation containing 42.6% w/v phosphorus as phosphite (PO₃) and 28.4% w/v potassium (K₂O).

2. Application
Which crops is PHOSTER recommended for?

PHOSTER covers a broad crop range including hardy ornamentals, pot bedding, protected edibles, soft fruit,
top fruit, and vines - with application timings tailored to each crop's key root development and growth windows.

How does PHOSTER fit into an INM programme?

PHOSTER is designed for use within an Integrated Nutrient Management programme, complementing conventional
phosphate nutrition rather than replacing it.

3. Performance
What performance benefits can I expect from PHOSTER?

Growers can expect improved root development, better water and nutrient use efficiency, and a more resilient crop with reduced susceptibility to pest and disease pressure.

4. Sourcing
Why source PHOSTER through Fargro?

Fargro is the exclusive UK importer for Aiva Fertilisers, giving you direct access to technical support from both Fargro's agronomy team and Aiva's specialist contacts - not just
product supply.

Specifications

Crop Label recommendations for use on: hardy nursery stock, pot & bedding plants, protected edibles, soft fruit, cane fruit, top fruit and vines.
Stocking Units Bottle
Stocking Status Stocked