The differences between onion moss and garlic moss include different appearance and different taste.

1. Different appearance: the young stems of onion moss are slightly thicker, the leaves are relatively wide, and the color is light green or light yellow; while the young stems of garlic moss are relatively thin, and the leaves are relatively narrow. The color is darker, showing dark green or dark yellow.

2. Different tastes: onion moss has the fragrance of onions and a relatively sweet taste; while garlic moss has the spicy taste of garlic and has a relatively heavy taste.