https://i.ytimg.com/vi/sq9UDQzXJmA/hqdefault.jpg
Blender Tutorial: http://www.blenderguru.com/the-secret-to-creating-realistic-grass/
This 22-minute video tutorial will teach you how to:
◦Control particle strands
◦Save on render times by using child particles
◦Evenly distribute flowers across a plane
◦Effectively use the colorband feature
◦Make a field of uniform strands appear ‘lumpy’
source