When spinach is fresh, it's a vibrant green color and has a crisp texture. But, as it starts to go bad, it'll begin to wilt and lose its oomph. Keep an eye out for leaves that are slightly soggy or have yellow or brown edges - it's a sure sign that your spinach is on its way out!
Now, you might be thinking, "What about the smell test?" Well, let me tell you, if your spinach smells like a swampy pond, it's definitely gone bad! A strong, pungent aroma is a clear indicator that your spinach has turned to the dark side. Trust your nose, folks - it's usually right!