How could a sentient plant evolve and what conditions would be required for this evolution?

This is my entry for the fortnightly topic challenge

In Day of the Triffids, many people go blind and the basic summary is this:

• virulent plague makes most of humanity blind

• giant, semi-intelligent plants take over.

In the world I am creating, humans have to face off with an intergalactic plant "empire" that has more advanced tech than we do. My question is this:

• How could a sentient plant logically evolve and what are some key environmental and sociological factors that might come into play or dramatically impact the evolutionary process?

posted over 9 years ago

JDSweetBeat‭

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