Yu Hagioita shows how you can quickly make a growth effect while in Side FX Houdini.
A new tutorial from Yu Hagioita (HAGI) shows how you can create a classic growth effect in Houdini with a few simple steps.
The tutorial uses scatter/copy to points, a Pyro source, among other Houdini tricks. You can download the project file for the growth effect here.
Have a look at some other growth and growing tutorials that use different techniques here.