According to David Suzuki and other scientist they do.
Plants compete for food
Plants protect their off-spring.
If certain bugs harm certain plants, plants send a special scent signal to other bugs who would come and eat the bugs which were harming the plants
Plant siblings look after each other and care for them and try and kill other plants who may compete for food
Some plants eat bugs
Some plants are a predator to other plants and have likes and dislikes for the plants they will like for food.
See the full episode of The Nature of Things on Plants here.
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