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the mutual intelligibility barrier between humans and plants makes it impossible to know whether the concept of democracy is supported by the plant kingdom or not
they cannot express their vote in an eligible manner
Plants have no proven sentience and ability to communicate their vote. As they are unable to vote -- and will never be able to vote -- there is no reason to give them voting rights.
This will only open the floodgate to plant-based racism
There are laws that can effect plants as well.
How do we know they currently don't vote in their own society? We humans are very naive.
plants are not intelligent
The Triffids are coming and they'll be pretty upset to find we've denied them rights.
Plants are diverse living beings which inhabit every country on Earth. Politics affects them (Evironmental policies, agricultural and technological development, transportation, etc.) in a very direct way and thus they should have a say.
Plants are not people.
Plants are not citizens. They do not pay taxes, and therefore are not granted the rights that human citizens are granted, including voting.
They can't express their opinions and feelings
Plants cannot communicate with humans and vote in an eligible manner, nor can they assist in the right to govern. They should be granted, however, the right to assemble plant governments and restrict Venus fly-traps (also known scientifically as Trumptraps) from fucking everything up.
Plants have no place in human society, thus shouldn't be allowed to vote for the destiny of our species.
Plants have feelings too.
A population is a group of individuals of one species that live in a particular geographic area where as a community is all the organisms that inhabit a particular area; an assemblage of populations of different species living close enough together for potential interaction.