Make Your Own Tools
The core verbs are composable on purpose. A recipe you build, a few Grow steps wrapped in a Repeat block, a Switch between alternatives, is already a reusable piece. The next step is to wrap that piece into your own tool: a node, or a Houdini Digital Asset, that behaves like the ones Natsura ships and that you can reuse across scenes and hand to other artists.
This is the same move the shipped Grow makes. Grow is not atomic; it is a composition of split, switch, and repeat given an artist-facing shape. You can build your own compositions the same way, name them for the organ or behaviour they model, and expose just the parameters that matter. Pair this with Custom Maps to give your tool a mappable parameter surface, so it can be driven by attributes like the built-in nodes.
Detailed walkthrough pending.
For the grammar these compositions are built from, see Simulation.
VEX
VEX is the common language for extending Natsura's growth: computing custom effector fields, authoring attributes and gates with wrangles, and exposing custom mappable parameters.
Commercial Use
What you need to use Natsura commercially. Natsura is a Houdini plugin, so your rights depend on both your Natsura licence and your SideFX Houdini licence.