Flowers, trees and plants in the bible and their symbols, just interesting!

http://www.catholictradition.org/Saints/signs4.htm

“As for man, his days are as grass.” (Ps. 103:15.)
In the psalms and the writings of the prophet Isaiah, we see grass used as a symbol—a symbol that persists through the end of both Testaments:

“As for man, his days are as grass: as a flower of the field, so he flourisheth.

“For the wind passeth over it, and it is gone; and the place thereof shall know it no more.” (Ps. 103:15–16.)

“All flesh is grass, and all the goodliness thereof is as the flower of the field:

“The grass withereth, the flower fadeth: because the spirit of the Lord bloweth upon it: surely the people is grass.

“The grass withereth, the flower fadeth: but the word of our God shall stand for ever.” (Isa. 40:6–8.)

Grass represented the transitoriness of man. With the heavy rains of wintertime, grass flourishes and spreads its velvety green carpet even over the barren wilderness, but with a blast of the transitional khamsin (the desert wind), it is gone. The blades are vivacious and vigorous one week—gone the next. So is the life of man.

With such a transitory life on earth, we can be comforted by the permanence of an unchangeable and never-ending Providence: “If God so clothe the grass of the field, which to day is, and to morrow is cast into the oven, shall he not much more clothe you, O ye of little faith?” (Matt. 6:30.)

The prophets also used grass symbolically in decrying the instability of riches and the emptiness of pursuing them: “The rich … is made low: because as the flower of the grass he shall pass away.

“For the sun is no sooner risen with a burning heat, but it withereth the grass, and the flower thereof falleth, and the grace of the fashion of it perisheth: so also shall the rich man fade away in his ways.” (James 1:10–11.)