: : You cannot grow much food in the parking lot of the factory: Try this: get a bunch of hatchets. Bring your friends out to the factory, and have them attack the concrete of the parking lot until it's all removed. Put the concrete into a pile. Double-dig the soil that was once under the concrete. Get some pea seeds, put them in the ground. Liberate a hose from the garden store, hook it up to one of the faucets in the factory, water the peas. If management doesn't like it, strike.
Forgeet about the management. Just tell us how you propose to deal with those workers who will protest against your direct action on the grounds that they need some space to park their cars when they come to work?
While I would love to think anything is possible, I can not believe that direct action of the type you favour workable at all!