Here is our quince bush shortly after its planting, the photo taken on June 28th.
Here is the same plant, although the picture is taken from the other side, taken today, thus twenty days later. Notice that the very full bush in the previous photo has thinned out tremendeously. I should have taken a picture of the intermediate stage. In that stage most of the leaves now gone had turned brown and shrivelled up. If you look closely, you can see them littering the ground neath the bush.
Some of the new growth is now also either turning yellow or showing little brown tips, as in the close-up above.
The worst of it is that Monique's quince bush is now showing nothing but brown leaves, leaving us, at both sides of the Metro, anxious.
I've discovered so far (these are all possibilities from the Internet) that (1) we may have over-watered, but that the consequence may not be fatal; roots are over-saturated and can't get any oxygen or nutrition; (2) that quince plants are temperamental and do sometimes loose all of their leaves in June and July—only to recover them later; and (3) that replanting-shock in some cases and energy expended in other cases exhaust the plant temporarily. In any case, stay tuned...
I am also not entirely sure of the actual species we have planted. Possibilities are that we have Cydonia oblonga, quince, or that we have Chaenomeles speciosa, the flowering quince, which is an Asian variant. The first got its name from a place on Crete called Kydonia—and is the variety widely grown in Europe. The leaves, at any rate, look like Cydonia.