I wouldn't grow mint other than in pots; and already have a couple of pots of it. I think it probably comes under the heading of 'things best grown on the balcony', anyway - herbs are IMO sensible to grow close at hand so you can use them at will.

The quince might be good, though - thanks! And possibly the garlic (actually, I'd definitely like some of the garlic - it's a good salad veg & therefore would be good for the balcony, which will now be focussed on salad & herbs). I shall consult with Marna - we need to think about what we're going to grow, & how, & also to find out what sort of state the allotment is in currently (I don't know if it's come vacant because someone's left, or because they've not looked after it properly & it's been taken away from them).