The flower language of Setaria viridis is unrequited love, tenacity, hard love and unknown love. The moral of green bristlegrass is that you like someone but dare not express your unrequited love. If you like someone but are afraid to confess, you can give them green bristlegrass, and they will understand your heart. Setaria viridis can also symbolize perseverance, because the vitality of Setaria viridis is very tenacious, even in harsh environment, it can still grow and blossom well and play a role silently.

Setaria viridis is a common weed in dryland crops, which is found all over China, mostly in the wilderness and roadside below 4000m above sea level. Temperate and warm temperate regions originated in Eurasia are now widely distributed in temperate and subtropical regions all over the world.

Setaria viridis is an annual weed in late spring. Seeds generally germinate from mid-April to May, and the optimum temperature for germination is 15-30℃, with the peak in early and mid-May, and the fruiting period is-10 in August. Seeds can be spread by wind, running water and feces, and germinate after hibernation.

The stems and leaves of Setaria viridis can be used as feed or medicine. After the whole grass is boiled in water for 20 minutes, the filtrate can be sprayed to kill vegetable pests; Furfural can be extracted from spikelets. Setaria viridis has strong adaptability, drought tolerance and barren resistance, and can grow in acidic or alkaline soil.