© Denzil Green
That being said, there are general characteristics that Asian Pears mostly share, and general ways in which they can be grouped.
Asian Pears fall into 3 main types:
- Round or slightly-flattened with greenish or yellowish skin (the greenish colour tending towards yellow as it ripens);
- Round or slightly-flattened with brownish or orangish or bronzy skin with russetting (starting off with green skin, with the browny hues and russetting happening towards ripening;
- Shaped like a European pear, with green or brownish russetted skin.
The pears that originated in Japan tend to have yellow, brown or yellowish-brown skin; those that originated from China tend to have greenish-yellow skin.
Aside from the few that look like pears should, Asian Pears generally are shaped like apples and have the same crisp crunch as apples when you bite into them. They are not meant to be soft and buttery like European pears. They are bigger than European pears: the smallest is about the size of a good orange, and they can equal the size of a very hefty grapefruit.
Asian Pears bruise extremely easily, so they are usually shipped with padding (often little white foam net bags) around each one. Otherwise, they will turn black within a day in the spots where they have been jostled or bumped.
North American producers are adapting to the growing market demand for Asian Pears, but they have a few reasons not to like them entirely:
- European pears have to be picked while hard, otherwise they will go grainy and mealy on the tree. Happily, this fact also makes them easier to ship (and the pears will continue to ripen after picking.) Asian Pears stop ripening the minute you pick them, and so have to be left on the tree until well into the ripening and softening stage;
- Despite the fact that the Asian Pears won’t ripen or develop any more flavour after they are picked, growers are now being told they have to get them off the trees a bit early anyway (see “Internal Browning” below.) This impacts the flavour;
- All the Asian pear trees, if anything, produce too much fruit, so much that it can cause the limbs to break right off from the weight. Consequently, growers need to thin out the fruit when it is still very small, about the size of cherries. The trees produce many clusters of fruit, and the rule of thumb seems to be to leave one fruit growing per cluster. However, this adds to the cost of growing them, as you’ve got to pay people to go in and do the thinning. It also lowers your yield per acre.
A young Asian pear tree will start producing between 5 and 15 pounds (2 to 7 kg) of fruit after it is 3 years old. By the time the tree is 5 years old, it will produce 30 to 50 pounds (13 1/2 to 22 1/2 kg), and when it is mature, anywhere from 100 to 400 pounds (45 to 180 kg.)The trees generally never grow more than 12 feet tall (3 1/2 metres.)
The ripeness of Asian Pears isn’t based on firm they are, as they will always be firm and crunchy, but rather it is based on fragrance (so again, close your eyes and sniff when buying.) The fruit, though, has to be picked from the tree before it gets soft, as then it is overripe and can feel spongy.
Besides being shaped differently and having a different texture from European pears, Asian Pears have another distinguishing feature. If you let European pears ripen on the tree, they taste awful. Asian Pears you can let ripen on the tree, and pull them directly off and eat them.
There have been reports of Asian Pears that look fine on the outside, but when the consumer gets them home, the pears have gone a yucky, mooshy brown inside. This is called “internal browning” and is in fact a worldwide consumer complaint about Asian Pears. Producers have found, through trial and error, that this occurs during storage, sometimes during the very first month of storage, and generally happens mostly to Asian Pears that have been picked more than 180 days after full bloom on the tree. Producers around the world are sharing knowledge on what exactly is causing this problem and how to prevent it, but in the meantime, they are going on what they know and picking the pears just a little bit early, which impacts the flavour.
The varieties of Asian Pears most susceptible to “internal browning” are Daisui Li, Olympic, Serui, Shin Li, Shinko, Tsu Li, and Ya Li. If you get a bad one, take it back to the store as the produce manager should know about it: the whole shipment may be bad. They may not want to know, they may prefer that you just pitched the pear and let them keep your money, but we’ll give them the benefit of the doubt here and assume that like all good produce sellers they care about the quality of the food going out their doors.
Asian Pears give off a lot of juice when cooked, so if you are using them in something, be prepared to need to compensate a bit.
Most Asian pears are classed for canning purposes as low-acid (in contrast to European pears.) A strong acid such as lemon juice must be added to them to make them safe for boiling water canning. The recommended ratio is 1 tablespoon of bottled lemon juice per 500 ml / US pint jar. 
Asian Pears have a very long storage life compared to other fruit. See entries for the individual varieties for storage times, as storage life will vary. But in general, you can keep them at room temperature for up to two weeks, and in commercial storage where a precise temperature range around 34F (1 C) can be maintained, some varieties will store for up to six months.
Asian Pears seem to have been cultivated in what is now Japan, China and Korea as far back as 1100 BC, making them the oldest cultivated type of pear in the world. The market for Asian Pears in the Western world started in the 1980s, with demand coming from Asians who had moved to the West. Now, 25 years later (2004), other consumers are catching on, too. New plantings are being done to accommodate the market for these consumers.
Literature & Lore
Sometimes Asian Pears are called “Apple Pears.” Just as Jerusalem Artichokes got their name from some misguided soul who thought s/he was being helpful, but who ended up creating a lot of confusion (fingers have been pointed at Samuel de Champlain), and just as Christopher Columbus has a lot to answer for in calling a chile a “pepper”, someone thought that because these pears were shaped liked apples and were crunchy like apples, “Apple Pears” would be a really helpful name. They were wrong. You end up seeing things like this in print: “Asian Pears are a variety developed by crossbreeding pears and apples, combining the mild flavour of the former with the crispness of the latter.” They are nothing of the sort, they are pears through and through. As you have seen, the generic term “Asian Pear” is causing enough confusion as it is, without nonsense like that going around.
 National Center for Home Food Preservation. “A Particular Pear to Bear in Mind”. 24 October 2014. Retrieved November 2014 from http://preservingfoodathome.com/2014/10/24/a-particular-pear-to-bear-in-mind/
- Atago Pears
- Chojuro Pears
- Dasui Li Pears
- Hong Li Pears
- Hosui Pears
- Ichiban Nashi Pears
- Ishiiwase Pears
- Kikusui Pears
- Kosui Pears
- Niitaka Pears
- Okusankichi Pears
- Olympic Pears
- Seuri Pears
- Shin Li Pears
- Shinko Pears
- Shinseiki Pears
- Shinsui Pears
- Tsu Li Pears
- Twentieth Century Pears
- Ya Li Pear
- Yakumo Pear
- Yoinashi Pear