These parameters are defined in seed blueprints, not the crop plot. Look for the “crops” category at the very bottom. It has overall fertilizer/water consumption rates and stages of growing with their own fertilizer requirements and mesh definitions.
Setting a single growth stage will probably give you the wanted instant-grown plant, and setting no produce (don’t remember the field name) will prevent any fruit from appearing. However, you will still need 1 inventory slot to insert the seeds.
What the crop plot settings control is water capacity and the range within which water taps will irrigate them.