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  • Common Name Magnesium
  • Scientific Name Mg
  • Areas affected All plants. Common in tomatoes, apples, raspberries, grape vines, roses and rhododendrons.
  • Main Causes Poor growing conditions, light, sandy soils and overuse of high-potassium fertilisers.
  • Timing Mainly during spring and summer.

What Does Magnesium Do?

Magnesium has a wide range of roles in a plant. As magnesium is a building block of chlorophyll, the nutrient’s main role is to aid in the process of photosynthesis and promote healthy, green leaves.

Symptoms Of Magnesium Deficiency: 

A plant with a magnesium deficiency will often have yellowing between the veins of the leaves. The leaves will occasionally also have red/brown tints and may fall prematurely.


To rectify a magnesium deficiency, use a fertiliser containing high amounts of magnesium, such as NutriFlo Mag-Sul which contains 6.8% magnesium.

Magnesium Sulphate is also ideal as it contains 16% magnesium oxide.


We recommend using a fertiliser with a high magnesium content, for example NutriFlo Mag-Sul. EpsoTop Bittersaltz is also ideal as it contains 16% magnesium oxide. 

For more information on nutrient deficiencies, please contact our sales team on 01522 246491.