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Simple, straightforward potassium, from fruit set through to harvest.

What it's for: Liquid fertiliser based on potassium oxide (15% K₂O) that boosts fruit size, ripening and resistance to abiotic stress.

Best for: Anyone who wants an easy potassium top-up without complications.

When to apply: From fruit formation through to harvest.

How often: Throughout fruiting.

Dose: Watering 10 ml/l. Foliar spray 5 ml/l.

How to apply: Dilute in the watering or spray.

Worth knowing: Simpler than no. 18: potassium only, no fulvic acids. Pick 18 if you also want to improve the soil.