Aim of the game
When playing as a wild plant, the aim is to make as many seeds as you can to out-compete your rivals and avoid extinction.When a farmed plant you need to make as many big seeds as possible.
To make seeds, you will need to grow roots to get water and minerals, leaves to trap energy from sunlight and flowers for pollination by insects. You need to grow these at the right time, so use the water and minerals you have collected wisely and make sure you keep an eye on rainfall, sunlight and other things going on in the environment.
http://www.darwin.rcuk.ac.uk/581/all/1/Grow_your_own_plant.aspx