Using Dishwater on Plants: Safe and Slightly Beneficial

Greywater for the Garden? Yes, Within Reason

Dishwater (greywater) is mildly alkaline and contains food particles that add nutrients. It's fine for ornamental plants, but avoid using on edibles if you're concerned about soap residues.

Don't rely on it as fertilizer—it's a supplement, not a substitute for proper feeding. And never use water from washing dishes with harsh chemicals or bleach.