How to prevent crystallization of honey?
When the temperature of the honey dips below 50°F, the crystallization process will accelerate. Don't store honey in a chilly basement or unheated mudroom. To slow crystallization naturally, store your honey at room temperature or warmer (the warmer the better). Store honey in glass jars instead of plastic.
The best way to keep honey from crystallizing is to store it at room temperature, notes Weintraub. The most ideal storage place is in a dark cupboard away from direct sunlight. Avoid storing it in the refrigerator, as cooler temperatures will make honey crystallize faster.
The addition of trehalose is used to prevent crystallization.
Store honey in a cool (50°-70°F) and dry location. Storage temperatures above 70°F will compromise the quality and nutrients of the honey over time. Cooler temperatures, i.e., cold storage or refrigeration, will quickly crystallize honey and should be avoided.
One of the reasons most grocery store honeys will not crystallize is because they have been pasteurized, which requires high heat. The most ideal temperature to induce crystallization is 57F–the further you get away from that number on either side, the slower a honey will crystallize.
Crystallized honey is safe to eat. But, just like the liquid form of honey, avoid feeding children under one year old with honey. Honey may have traces of Clostridium botulism spores that could cause botulism poisoning in infants. Freezing and heating honey won't destroy the spores.
Keep honey in sealed container.
Glass jars with lids are also ideal for storing honey as long as the lids are on tight so the honey won't be exposed to air, while not being used. It isn't recommended to store your honey in non-food plastic containers or metal containers because they can cause honey to oxidize.
Crystallization happens much faster at lower temperatures. Even in a beehive, honey can begin to crystallize if the temperature drops too low. When the temperature of the honey dips below 50°F, the crystallization process will accelerate. Don't store honey in a chilly basement or unheated mudroom.
What Honey Does Not Crystallize? One exception to this is Tupelo honey. Tupelo honey has a very high fructose content and low glucose content, so Tupelo honey will almost never crystallize. Because of the low glucose level, Tupelo honey has a low glycemic index.
This durability is thanks to the unique features of honey: it is low in water and high in sugar, so bacteria cannot grow on it. Honey also contains small amounts of hydrogen peroxide, which inhibits growth of microbes.
Does honey go bad in plastic containers?
When it's stored properly, honey never goes bad, Grad said in an interview with Allrecipes. "Honey will darken and/or crystallize, but it is still safe to eat," she said. Metal or plastic containers can oxidize the honey, and heat can change its flavor.
For best quality, store honey for up to 12 months. After that time, it remains safe but the quality may not be as good. Honey can become cloudy, crystallized or solidified but this is not a safety concern. The honey can be microwaved or heated in a pan of hot water to clarify or melt it.

Temperatures lower than 50 degrees Fahrenheit (10 degrees Celsius) can cause crystallization. During those cold winter months, the honey in your cabinet might begin to crystallize because of the lower temperatures. You might see white flecks not only out your window but in your honey, too.
Thankfully, honey can be returned to its liquid state with little effort. Heat some water in a pot, and put your honey container in the pot of hot water until the honey turns liquid. This gentle transfer of heat to the honey helps bring it back to liquid form without overheating the honey.