dyzzypyxxy said:
But magnesium generally comes in an extremely soluble form, so if you're thinking of testing soil in a garden bed or pot you've been watering regularly, or if you've had a lot of rain it's likely you'll find there's little or no magnesium. Also it's very good for most plants and it's hard to imagine there ever being too much in soil. It's necessary for plants to produce chlorophyll in their leaves.
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