I saw a documentary on TV, of land that was riddled by drought, the storms came and the time lapse photography showed the green grass returning.
The time lapse was over 96 hours.
After heavy rain, the grass appeared in the puddles on the cracked land,
24 hours, the grass was several inches in height and after 96 hours the grass had started to seed. Over the 4 days, the colour of the soil changed.