The differences between pepper powder and plant ash are as follows:

1. Different sources: pepper powder is ground from the fruits of the pepper plant, while plant ash is obtained by burning plant materials. ash.

2. Different uses: Pepper is usually used as a seasoning to add fragrance and spiciness to food, while plant ash is usually used in agriculture and gardening as a soil conditioner and fertilizer.

3. Different ingredients: The main components of pepper are piperine and volatile oil, while the main components of plant ash are carbonates and minerals.

4. Different tastes: pepper has a spicy taste, while plant ash has no obvious taste.

In general, pepper and plant ash have obvious differences in origin, use, ingredients and taste.