Opal52, I have seen a very similar problem with my broccoli! I had wondered if it was heat-related, as my porch is west-facing and very hot in the afternoon, and I had even thought the leaves look "burnt" (turning yellow, then an orangey-red) but I hadn't thought about it being from contact with the container. Mine are in very small containers right now but I'm looking for bigger ones to move them up. I'm also going to hang shade cloth over part of my porch to try to give them a break from the sun. I'm also starting a battle with cabbage loopers, but that's a whole 'nother post, LOL. Here is a link that might be useful: my flickr photos: broccoli (and other veggies)

The other wild thought was if you had a touch of frost. They aren't frost hardy (at least, the Abutilons in my garden aren't.) They may need moving on in pot size over the growing season. Once they've settled down and developed a decent root system they bulk up quite quickly. I'd say - good potting mix, moderate water and gentle with the fertiliser. Quite drought resistant so long as they haven't maxed out their food supply.

Common causes of crispy leaf margins: Over-watering Too much fertilizer Under-watering Fluorine in water Using species as a guideline to whether plants prefer full sun or not is very helpful, but plants still vary greatly within species & the amount of sunlight any given plant will tolerate/prefer is genetically determined. It is, of course, best to acclimate plants to full sun slowly in most cases. This increases the amount of the pigment chlorophyll in green tissues & helps prevent sunscald. Chlorophyll is natures sunscreen for plants. If, after gradual exposure to full sun, the leaves appear bleached or whitish, it is an indication that the plant is not capable of producing enough chlorophyll to protect itself from full sun & it should be moved to a shadier location. Al

So as usual my eggplants are being destroyed by flea beetles this year. I took the advice and covered them with row covers for 2 weeks until I discovered that they were infected with early blight. I think the combination of wet humid weather and row covers is causing that, so I had to take the cover off. I have one eggplant planted in the tomato bed with no mulch. The other eggplants are all mulched with shredded oak leaves. What I have observed is that the one with no mulch is not bothered at all by the flea beetles even though they are all basically next to each other. The others have so many holes. I think next year I am going to try no mulch on all my eggplants.