Is it possible to either hide the foliage or physically crush it when this door is open?
Ooof. I’d file that one under “hard.” 
One way: have an extra one-sided flat mesh door, set it on a different layer and show it with a camera that is “clear depth” and layers atop your main camera view.
Another way: make the door different, like have the solid pressure vessel door pull aside laterally and a steel grid ramp spring down so it doesn’t seem so wrong when bushes poke through the grid.
Google up water poking through the bottom of rowboats… analogous problem.
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Ah ok thanks. I’ll play around with the layers and see how that works.