I always consider July 15 to be the deadline for planting hardy brassicas like Kale, overwintering Broccoli, and Collards from seed in order for them to attain sufficient size to make it through the winter. Using starts later like you're planning would work out about the same. One year I had my best ever bed of non-hardy Bok Choy seeded then. But the short DTM bush bean Contender planted at the same time couldn't make it to ripe beans, because the heat levels slowly drop off toward fall. I would think cool season vegetables would be a better bet, and I haven't tried potatoes planted now.

I harvested a couple of Uzbekski cukes yesterday, and Lemon and North Carolina Pickling are not far behind. Squash are forming also. So far I've only had one tomato but should soon have a lot. The bush beans have been blooming and the pole beans are starting to grow past the top of the trellis, so it's so far a good growing season for me.;-P

You can plant a late crop of beans, carrots, beets, turnips, kohlrabi, any leafy greens. The trick is in keeping the soil surface moist and cool until the seeds germinate. I use poly row cover and mist it down a couple times a day if possible. I've never tried a second crop of potatoes, but I know that's really common among gardeners in the UK.

I have already planted my fall and winter brassicas, fall carrots and beets, but I will still plant spinach and chinese cabbage this week. I continue to plant lettuce every 3 weeks, and you could put an enation resistant strain of snap peas in for fall harvest.

We are harvesting broccoli, chard, summer squash, basil, and lettuce from the garden right now. Tomatoes and cucumbers have begun to come on and the pole beans are flowering. Isn't it wonderful to skip the produce section in the grocery store!

I am still struggling with a too large vegie garden that is full of weeds, BUT I discovered the soil forum on G/W and am now regaining my garden through lasagna gardening. I have some tomatoe plants that I affectionately call Godzillas -- they are enormous (just in flower though, starting to set fruit), squash plants that are taking off and look like they are going to smother everything in sight and I picked a couple of cukes this week. My broad beans are finished and the pole beans haven't started but we have a bumper crop of peas. Leafy greens and beets are doing ok (they aren't in the lasagna garden) and we have had a few artichokes. The best part of the garden though is the raspberries! They are huge, tasty, red beauties. I mulched them with leaf mould and grass clippings in the spring and have not had to water them much but they are obviously very happy. Except for a few white drupelets from the sun and heat they are just wonderful. Nothing tastes as good as your own produce. I love it.