Garlic flavor works okay too

Not strictly deerproof unless you add some extra poles or netting. Deer COULD break down the plastic, but it should be relatively easy to keep them out. I may end up trying to do some rodent-proofing on this one, since my friend has a local woodchuck population that made off with all her melons last year. We'll see.

Oh, didn't notice the lighting Q.

We talked about the lighting and yes, it's more for 'seeing' than for 'growing', since the sun takes care of THAT. She works a day job that rarely allows her to be home before 6, so a lot of greenhouse chores will be done at night. We were thinking about just 4- 4' shop lights hanging high from the ridge pole. Each weighs only a few pounds and will give plenty of light to work by after dark.

If you are interested in using correct agricultural lighting, such as 4- 1000w MH lamps with reflectors that are appropriate to what can be a WET environment, I'd replace all the 'secondary' ribs with 3/4" PVC and replace the 3/4" ridge pole with a full inch diameter one, and instead of securing the ridge pole by zipties, use BOLTS.