Failing all the above you could borrow a rotavator and dig the lot up and swear black is white you went green and it was your Veg Patch - no one says a garden has to be all grass
Unfortunately in Quarters yes it does. Your only expected to cut the grass and if you do anything to improve your life in their property then you have to pay double to turn it back to sh1t.
I hate Defence Estates so much it hurts at times.