Standard size tomatoes and cucumbers, carrots, that kind of thing. I wonder if it’s too late for sowing cucumbers.

You have nothing to lose by trying, well barring a bit of time watering.

Just so you know I’ve got some brand new tomato plants on the go from seeds and they’re loving it, very late start for those. With the weather how it has been this season I’d predict that that the fruiting period will be into late May. I’d hope cucumbers would be the same with ample regular watering.