Apparently tender, or is there a rumour it can take a bit of frost if dryish? These two plants have been romping away in my greenhouse for 3 years (there's a three big leaves on the big one in a large pot at the bottom, and smaller leaves on a multi-stemmed smaller plant in a smaller pot higher up), having spent the winter indoors. They get semi-dried it off over winter, and the leaves are cut off as they get messy with aphids. Looking forward to a good harvest - those leaves are the biggest I've seen on them, size of dinner trays!
Easy from seed, being my first year with it this is growing in pots. It's currently in 2.5 and 3 inch pots, and been flowering all summer - but it's the leaves I'm after. They've a mild taste, more than lettuce; they're succulent in texture (as you might expect from a seaside plant), and unlike lawn plantains, there's no stringiness (except there's a little in older leaves). There's a little attention from slugs - we'll see how much damage they cause when I start growing them in the bed.
Physalis peruviana, Cape Gooseberry
I started growing this a while back - now one of my plants is in its third season. They take a while to mature from seed sown in spring, and you may get the odd fruit in that year - not like tomatoes! But they are perennial, and will grow from underground if protected overwinter. They don't suffer potato blight, and are happy outdoors in summer. So mine are all in pots that I can move in and out. My seed comes from bought fruit: so another of my plants has calyces the shape of pumpkins.
At least some varieties appear to be day-length sensitive: one grown from seed has never started flowering at a sensible time to form fruit, it's much too late for the middle of the UK.