The Growth attribute accesses the growth pattern of a model as it was defined in Cinema (if it was defined). If not defined in Cinema, the 3ds Max control will have no effect.

Unlike Cinema, in 3ds Max, growth is mapped to a percentage (0.0 to 1.0) and defaults to 1.0 (final state of growth). The screenshot below is an example timeline in Cinema.

In this example, 0.0 growth maps to frame 1 and 1.0 maps to frame 300. To get a frame-for-frame map with Cinema, keyframe the percentages to span 300 total frames, but many other mappings are possible.