1, spread by water. Plants that grow near the water usually spread their seeds by water power. Coconut: spread by water. When the coconut is ripe, it falls into the sea and floats away with the sea water. Water lily: The fruit of the water lily sinks to the bottom when it matures. After the pericarp decays, the seeds covered with spongy exocarp will float and drift to other places.

2. Spread by birds or other animals. Cherry, wild grape, wild ginseng, Bidens bipinnata, fig and plantain: Birds or other animals eat seeds in their stomachs, but because they can't be digested, they are discharged with feces and spread in all directions; Or the fruit sticks to clothes or trousers, or sticks to other animals and is taken to other places. Pine nuts: They were taken away by squirrels when storing winter grain.

3. spread by the wind. Some seeds or fruits will grow hair, and when the wind blows, they will float to far places, such as dandelion, blackboard tree, Showa grass, red willow, etc., and spread the seeds to far places through flying catkins.

4. Use elasticity to expand. If the ripe fruit is lightly touched, the fruit will crack and the seeds will be ejected by the elasticity of the peel. This is a method of sowing seeds mechanically. Such as impatiens, bauhinia, bauhinia and so on. Many leguminous plants use elasticity to spread seeds.

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