I help plants climb up toward the sky, I’m like a wall, but holes go by. I’m criss and cross, a wooden net, What am I that flowers can’t forget?

The answer to which came first. Scientifically speaking

Thinking back, they’re like god, though never worshipped. How could this friend be by our side for so long?

From the center I spread, The same roots but differently-led. A division that multiplies, My name also describes my action.

If you are too lazy to solve this riddle, you may be exhibiting a deadly sin. The giant ground ones went extinct ten thousand years ago.