Flat Spurge returns earlier in the spring than most warm-season grasses and continues to grow well into late fall. It also stays green in subtropical winters. The optimum growth temperature is 25-35℃. Annual rainfall of 1200mm under the conditions of good growth. The area south of the Yangtze River is generally early tillering in mid-May, pulling in early June, pregnant spikes in mid-July, spikes flowering from late July to early August, fruiting at the end of August, and seed maturity in September to October, with a low fruiting rate and small seeds that are not easy to harvest.