I would probably go about that by finding the offending shrub in the CK (with the Skyrim BSAs already extracted as NexusComa suggested) then editing the base item, and adding the NullTextureSet texture to them (might be 1 part or several, set that on all of them) to make it all invisible. Still be there but you won't see them. That is what I would do with a static anyway, I am assuming a little that plants work the same way, can't say i've edited one before.