Possibly how to set grass type

[mariomadproductions]

In hex tree, the "level entry/gfx set" in the objects section header seems to change the graphics the horizontal grass object (0x43) uses.

E.g. if you change the value in this e-card level Card-e+ - Series 1 - 07-A002 - Star-02 - Classic Course W1-2 (Japan) from 0x03 to 0x18, it changes from underground/rocky grass to overground/less rocky grass.

Not sure how smaghetti handles it atm, but maybe the "3" here is related to the 0x03 mentioned above?