Magnesium deficiency???

Hey All I think I may have a magnesium deficiency and I have have read a bit about what to do adding Epsom salts to the water any thoughts on this issue The margins on my biggest most mature ww has a slight rusty brown color on the leaf margins should I be worried or should I just let it be?

When you say margins, do you mean the edges? Pictures will always help us to determine your plants problems, but it "sounds" to me like nutrient burn.

Here all you need to know about Magnesium.

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Who neg repped me.