1

Firstly, a rubber sheet, preferably 1 mm thick will be needed so the roof will be protected from water that may potentially seep in. The length and width of the sheet depends on how large you would like your roof garden to be.

2

Secondly, a minimum height of 10 cm of soil should cover the sheet. However, by putting more soil, you expand your choices as to what you can plant since root sizes vary.

3

Lastly, but perhaps most importantly a mixture of liquid fertilizer and grass seed sprayed on during the rainy season will get the roof garden started.