For me a plant that kills the plants around for a short growing season is a weed. The dandelion is a good example of this, killing grass around it and spreading seeds.
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If you make the ship big enough, they form oceans and an atmosphere.
Water would be 'down' just like water on Earth which is attracted to Earth by gravity. So a spinning object would have 'down' feel like the outside of the craft and 'up' be towards the center of rotation. The closer to the edge you get, the stronger the artificial gravity. Thus there would be no 'gravity' at the center.