Greenhouses come in all shapes, from standard rectangular shape, to round or even conservatories connected to house. There is no best size for a greenhouse. The size that fits your space best works fine. Even a small greenhouse can accomodate many plants. Some commercially made greenhouses are extendable with add on sections to add as needed.

The best available material for a greenhouse frame is aluminum. The maintentance is very low, it never deteriorates, and it allows most light in due to it being thinner than wooden frames.

Make sure you allow for good ventilation. Allow room for at least one work bench. Keep in mind that you will also need storage space in greenhouse for extra pots, hand tools, etc.

Vinegar will kill most weeds. However, grocery store vinegar is normally a 5% solution and is too weak to do job. Ten-percent vinegar will kill most weeds and usually is found where canning and pickling supplies are sold. A 20% solution of vinegar kills really stubborn weeds, but is frequently more than twice as expensive as 10%. Try 10% for brick patio weed control before you make investment in a stronger solution. Spray vinegar directly on weeds, using shield mentioned above and taking care not to inhale fumes. You may also want to wear gloves and eye protection as a further safeguard for this type of brick patio weed control.