Slimy or mushy texture
Strong sour, rotten, or foul smell
Dark brown, black, or translucent spots
Wilted, limp, or excessively soft leaves
Leaves that are yellowing or browning throughout
Mold or fuzzy growth
Excess moisture or pooling liquid in the container
Leaves that feel sticky or slippery
Off taste if sampled
Outer leaves that are severely damaged while the rest is deteriorating