I may have already started this thread on the forums however this project has had better results than I expected. The idea is that grass clippings will gradually decompose and produce heat which can escape easily however when there are pieces of roofing plastic placed over it, a lot of the heat will be trapped. Since it is well known that bamboo as well as other plants will grow faster at higher temperatures, an addition of several degrees should increase the spread of rhizomes especially because the moisture is also held in a lot better.
I started this project with phyllostachys edulis (moso bicolor) since I want it to become a grove as soon as possible and here are the pictures to show the progress.After the first week the temperature differential was around 5-6F however after around 3 weeks once the air temperature dropped, there was a 16F temperature differential as it was 62F for the air temperature, 66F regular soil temperature, and the temperature in the heated area is up past 82F as it looks like the warmth never escaped. I use a needle thermometer to take my readings.
Adding grass clippings
Outside soil temperature.
Adding more grass clippings and tiles.
phyllostachys aureosulcata spectabilis.