Why Does Honey Crystallize?
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The process is called crystallization (also called granulation or candying).
All pure, raw honey will crystallize eventually — it's actually a sign of quality and purity. It is worth noting that crystallization alone is not a guarantee of quality — while pure raw honey does crystallize naturally, adulterated honeys with added sugars can also crystallize, so crystallization by itself is not a reliable test of purity. Honey is a supersaturated sugar solution, meaning it contains more dissolved sugars than water can normally hold.
Over time, those sugars naturally want to return to a solid state. The key is the ratio of two main sugars: glucose, which has low water solubility and crystallizes readily, and fructose, which stays liquid and resists crystallization. The higher the glucose-to-fructose ratio, the faster a honey crystallizes.
Some honeys crystallize within days or weeks of leaving the hive. Star thistle is famously quick to crystallize, which is why it's ideal for creamed honey. Rapeseed honey can solidify so fast it actually sets up inside the comb. Dandelion crystallizes very rapidly into a fine, almost buttery texture, while clover crystallizes relatively quickly into a smooth, spreadable consistency.
Other honeys resist crystallization almost indefinitely due to their very high fructose content. Tupelo, from the American South, is legendary for staying liquid thanks to its exceptionally high fructose ratio. Acacia, also known as black locust, stays liquid for years and remains almost water-clear. Sage is very slow to crystallize, and sourwood is another Southern honey well known for remaining liquid.
The size of the crystals also varies considerably from honey to honey. Some, like canola, crystallize into a coarse, gritty texture, while others like clover or star thistle form very fine, creamy crystals. This is precisely why star thistle is so beloved for making creamed honey — also called whipped or spun honey — where crystallization is deliberately controlled to create a smooth, spreadable product.
Crystallized honey is completely normal and hasn't gone bad — it's simply in its natural solid state. You can always gently warm it to return it to liquid form.