Pigeon peas must be grown as an annual in most parts of the U.S. since plants are killed by freezing temperatures.
(Pigeon peas; must be grown; as an annual in most parts of the U.S.; since plants are killed by freezing temperatures) (plants; are killed; by freezing temperatures)
Pigeon peas plants
must be grown are killed
as an annual in most parts of the U.S. since plants are killed by freezing temperatures
by freezing temperatures