Procedural Agrostis - free houdini asset
We're continuing to study the L-system with Houdini. One more procedural beauty - Agrostis (bent or bentgrass) is a large and very nearly cosmopolitan genus of plants in the grass family. And yes, it is growing and fully tweakable.
Availaible for free download and use https://gumroad.com/l/sWNEC

Nikolay Prduov - L-system construction and procedural shading
Ilya Lindberg - Idea, animation, lighting and camera