Westland Epsom Salts 1.5Kg

Yellowing leaves between the veins are a classic sign of magnesium deficiency, and Westland Epsom Salts is the traditional, no-nonsense fix. Dissolve it and apply as a feed or foliar spray to green up tomatoes, roses, and other magnesium-hungry plants in a matter of days.

A genuinely old-school remedy that's stuck around because it still works — simple, cheap, and effective when your plants are asking for exactly this.