No, I don't mean dung :-). I mean the tea leftovers. When you make tea, don't throw away those leaves/leaf parts on the bottom of your cup. Use them to help your plants grow (You can also use the tea itself-I will tell you how in a moment). Its also green because you use thing otherwise considered as trash.
Step 1: Tea Leaves Keep the Moisture
Before putting the dirt in the flowerpot put some tea bags/tea leaves inside. They will keep the moisture inside and give nutrients to the plant.