Plants require magnesium because it is one of the building blocks of chlorophyll. Chlorophyll is what gives the green colour in the leaves and helps a plant to photosynthesise by absorbing the sunlight.
When a plant does not have a sufficient supply of magnesium from its nutrients the oldest leaves begin to exhibit the deficiency. Small spots appear that are either a cloudy yellow or emulate the colour of rust. The leaves gradually become more yellow and begin to curl up. This typically occurs on the older leaves to begin with and then gradually spreads to the younger sections of the plant.
Flushing the system with clean water then replenishing the feed is a good idea.
Feed with Magne-Cal+ or a similar, good quality magnesium nutrient.
1ml of Magne-Cal is added to 1 litre of water and this will replenish the supply to the plant.
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