Rooftop Farming With 2 Liter Bottles: Functional, Beautiful, Inexpensive
1 - Making an opening in the bottle 7 to 10cm for each seed.
2 - Fill the bottle with potting soil.
3 - Drill the bottom of the bottles to promote drainage.
4 - Place the bottles in the corrugations of the roof (if sheet)
5 - Run tubes for for irrigation
6 - Connect the tubes to a 5 gallon bucket, trash can, or other rain water storage medium
7 - Sow the seeds into the soil and take proper irrigation regulating with quills.
This idea was implemented from a project by Carolina Forero, the Javeriana University, as a solution to a neighborhood in Altos de Cazucá, a community with a lack of potable water.
Through a series of workshops, Forero and her partner taught the people of the community to grow lettuce and radishes on rooftops using two-liter PET bottles and rain water collected in buckets.
Besides being a very interesting project that offers a functional design encourages anyone to implement it at home.
This photo details the connections: