You and your fellow scientists have been sent to Earth.
Your mission: Conquest
Your weapon: An organism Earthlings call a "plant". Your "plant" has been created to combine with other plant species on Earth and spread across the planet, changing the biosphere to support your own race.
Each player builds a nursery of 15 cards and, starting with the Alien Seedling - Code Name: Noraby, match numbered points along the sides and corners of the cards. However, each plant the seedling takes over may radically change the game.
And there are other things in the garden of Earth. Animals, insects, poisons, tools, and people that may hinder the spread of your plants, or unwittingly help.
The scientist with the most points and the end is the winner and shall be proclaimed Overseer of the new Earth.
Set number one will be "American Wildflowers". Later expansions will cover Mold, Fungus, Diatoms, Roses, Trees, etc.