Homemade plant fertilizer

A friend of mine told me a very simple recipe of a homemade plant fertilizer. My balcony is full of flowers. I adore them. So I decided to try my friend's tip immediately. And I must admit that it works:-) 

You need: 

- 2 liters of water
- 200 grams of bread (you can also use dry bread)

Break the bread into small pieces and cover it with water.Leave it to soak in a pot with a lid on for 12 hours. (I prepare it in the evening and leave it for night). 

After 12 hours just sieve the liquid and use it to water your plants. They will be happy:-) I use it 1 time every 10 days.