Epsom salt isn’t a complete fertilizer, and plants don’t automatically benefit from extra magnesium if their soil already contains enough.
How Gardeners Use It
If you want to try Epsom salt on a suitable houseplant, use plain, unscented Epsom salt.
A commonly suggested approach is to dissolve a small amount in water and apply it to the soil rather than repeatedly sprinkling large amounts directly onto the potting mix.
Start conservatively and avoid frequent applications. Too much magnesium can interfere with the absorption of other nutrients.
