The function of this formerly popular fruit tree has changed significantly to adapt to modern horticulture. The big but hard fruit of quince, Cydonia oblonga, is less perishable than the firmest pears or apples. Without canning or freezing, it lasts through winter in cool cellars. It also provides pectin for jellies of fruits that lack it. However, quince fruit is too hard to eat fresh, so should be cooked.
As food storage became less important, quince became less popular than more flavorful apples and pears, which are edible while fresh. Pectin is obtainable from apple cores and skins, or from supermarkets. However, quince are not completely absent from home gardens. They are now the unseen but common dwarfing understocks that limit the size of pear trees for suburban gardens.
The big lemony yellow fruits that are ripening now may look like very lumpy pears or apples. The largest sorts get as big as small cantaloupes. Developing fruit and new foliage are distinctly fuzzy. Fuzz can be polished off of alluringly aromatic mature fruit. Delightfully pale pink flowers are mostly obscured by new foliage in spring. The deciduous rounded leaves are two or three inches long.
The biggest of quince trees, which are very different from ornamental flowering quince, might get as high and wide as twenty feet.