Pools amassed

I formed in the heavens; they built me in a pure overcast Concrete looks far too weak to break my fallings contrast All flower petals decreed a landscape grown to everlast I will nurture them; in Sun to Moon, this time lines passed Are you the reapers breaking their stem via fatal dismast? I will defeat you with relentless moisture unsurpassed Nourishment is my very gift to the fortifying fibroblast I am not one, I am Legions found in the storms forecast Absorbed, watering them and feeding until all are colorfast From springs Allium till autumn's Zinnia falls hard and fast I am raindrops acting out the script for which I'm typecast Draw me in my friends before we are just pools amassed