Lot Owner Wanting to Pay For Garden Beds to Benefit Only Them

We have just received our AGM notice and two of the items refer to the owner of an end townhouse wanting a garden in the front of their townhouse for “privacy” reasons. They would also like to create a garden bed in the area next to their townhouse. They were given permission to install a door in the exterior wall and obviously now would lke a the OC to provide a garden. They have stated that if there are insufficient funds or the OC do not deem it a priority they are prepared to pay for the establishement costs themselves. I am very concerned that they are trying to take over common property for their own use and the OC will be liable for their upkeep just to benefit one owner. Are they able to do this under Strata Law?