Plants, Intelligent plants. Thats the plantarians, They're slow to make a decision, but won't back down once they do. Extremely adaptable,with subspecies living underwater, underground, and even in space! They use photosynthesis to get food from the sun.
They travel through space in large organic space ships,which are masses of vines woven together in a gas tight hull. They've recently discovered space travel and so are quite new in the galaxy.