Panicum maximum growing in Kandal province, Cambodia 2011. This is what is possible! As a trial 4 years ago I started a small plot south of Phnom Penh on only 1000m2 to test whether tropical forages could be grown in rice paddies with raised beds.
It quickly became apparent it was possible with careful water management and access to irrigation in the dry season. This stand is purple guinea or sometimes called Tanzania guinea, with seed available from Dr Michael Hare from the University of Ubon Ratchathani in north east Thailand.