Are you -people- not able to see that Allah is He Who sends down the rain water from the floor of the vault of heaven and directs its course through the earth to form springs and water channels and by its means He produces plants variegated or varied in colour. Later on they lose their bloom and their natural colour. then you see them turning yellow and drying up and they shrivel and decay, a process servimg as a reminder of Allah's infinite influence and Omnipotence to those who reflect.