A securable greenhouse is described. The greenhouse includes a frame upon which a first covering is placed to prevent access to the interior of the greenhouse. The first covering is a mesh constructed of expanded metal or similar materials. A second, transparent, covering separates the internal environment from outside, while a third, opaque, covering limits light entry into the greenhouse and visibility of the contents within, and which can be deployed or retracted as needed. A ventilation system controls air flow in, through and out of the greenhouse to regulate parameters like temperature and relative humidity. The greenhouse has moveable and lockable roof panels to provide access to authorized users, and a side access door as an alternate access. An optional automated control system determines optimal growth conditions and adjusts various features in order to achieve those conditions.