Protect your plant as you try to grow it and fend off the attacking ants.
Click on the plant stems to open a menu; you can either spawn a sprout or evolve that section of stem.
You can only evolve a stem into a root if it doesn't have a sprout on it. Roots will make the plant spawn more stems at their location towards the sun.
Stems can't grow over other stems though.
The green bar is the stem's health, the purple bar is the nutrients, and the blue bar is the water for the entire plant. Nutrients are used to spawn sprouts or to evolve the plant. If the water runs out the plant will start to take damage.