Viridian

the long version

"A virus has swept the world, turning people into human/plant hybrids. But the new species, the Verdans, are calm, happy, and peaceful. Everyone wants to go Verdan, and soon people asre queueing up to be infeceted. The only humans left are Immunes, like Jay, and a few obstinate hold-outs like his dad. The the Cultivars rise. Bred from the most dangerous plants on the planet, they are aggressive, powerful warlords. Their leader is the ruthless Viridian -- Jay's blodd brother and worst enemy. And Viridian won't sto[ until he's wiped out the last remnants of humanity...."--Back cover.