That jar of honey in your cupboard was perfectly liquid when you bought it. A few weeks later, it has turned thick, grainy, and hard to pour. Most people assume something has gone wrong, but crystallisation is actually one of the most reliable signs that the honey is real and unprocessed.
The sugar-like crystals forming inside the jar are glucose molecules that have separated from the water in the honey and bonded together into solid structures. Honey with a fructose-to-glucose ratio below 1.11 crystallises rapidly, while honey with a ratio above 1.33 crystallises slowly or not at all. The speed at which your jar turns grainy depends almost entirely on that sugar balance and how you store it.
Crystallisation does not mean the honey has gone bad, and slowing it down is simpler than most people expect. At Fleures Honey, we produce 100% pure, raw wildflower honey, and crystallisation is something our customers ask about more than almost anything else.
Here is how to keep honey from turning to sugar using six practical methods that actually work.
1. Store It at Room Temperature Rather Than in the Fridge
This is the single most effective way to keep honey liquid for longer. Temperature controls the speed of crystallisation more than any other factor.
The inside of a fridge sits between 4°C and 8°C, which is right in the zone where glucose crystals form fastest. Honey stored at that temperature can turn grainy within a week or two. Moving it to a cupboard at room temperature slows that process dramatically.
What the ideal storage looks like:
- Place the jar between 20°C and 25°C
- A kitchen cupboard away from the stove and out of direct sunlight works best
- Avoid windowsills where temperature swings between day and night
- Move it away from the back wall of the cupboard in winter when the wall gets cold
Honey does not need refrigeration at all. Its naturally low moisture content and acidic pH make it shelf-stable indefinitely at room temperature, so the fridge is doing nothing useful and actively speeding up the one problem most people want to avoid.
2. Seal the Lid Tightly After Every Use
Every time the jar sits open on the counter, the honey absorbs moisture from the air. That extra moisture changes the sugar-to-water ratio inside the jar and pushes crystallisation along faster than it would otherwise happen.
Moisture also creates a second problem. In warmer weather, honey with elevated water content can start to ferment, producing an off taste and fizzy texture that cannot be reversed. Sealing the lid immediately after every use prevents both issues.
Pro Tip: Honey that builds up in the lid thread creates a gap where the seal is not airtight. Wiping the thread with a clean, dry cloth before closing the jar keeps the seal tight and the moisture out.
3. Use a Dry Utensil Every Single Time
Introducing moisture on a wet spoon or knife creates localised spots inside the jar where the sugar balance shifts. Those spots become the first places where crystals start forming, and once crystals appear in one area, they spread through the rest of the jar faster than they would in undisturbed honey.
A dry utensil every time keeps the contents of the jar consistent. At Fleures Honey, we recommend keeping a dedicated honey spoon next to the jar so it is always clean and ready to use without introducing anything that does not belong in the honey.
Choose Honey Varieties That Crystallise Slowly
Not all honey turns grainy at the same speed. The floral source determines the sugar profile, and the sugar profile determines how quickly those crystals form.
Fast crystallising varieties include:
- Sunflower honey
- Canola honey
- Dandelion honey
- Certain wildflower blends with high glucose content
These can turn grainy within days or weeks of bottling, especially during cooler months.
Slow crystallising varieties include:
- Acacia honey
- Fynbos honey
- Certain eucalyptus honeys
These stay liquid for months because their fructose content is higher relative to glucose. Our wildflower blend at Fleures Honey is sourced from bees foraging across our farm, and the fructose balance in our honey keeps it liquid longer than most other raw varieties. Every batch is tested for sugar composition before bottling, which is how we maintain that consistency from jar to jar.
Did You Know?
Honey is one of the only foods that never expires when stored correctly. Archaeologists have found 3,000-year-old honey in Egyptian tombs that was still edible. The low moisture content and acidic pH create an environment where bacteria simply cannot survive.
Warm It Gently When Crystals Do Appear
If your jar has already turned grainy, fixing it takes about 20 minutes. The key is using gentle, indirect heat that dissolves the crystals without destroying the enzymes and antioxidants that make raw honey nutritionally different from processed honey.
The Warm Water Method
Fill a bowl or pot with warm water no hotter than 40°C. Place the honey jar in the water and let it sit for 20 to 30 minutes. Stir occasionally to help the crystals dissolve evenly. Once the honey returns to a smooth liquid consistency, remove it from the water and dry the outside of the jar before storing.
According to a review published in the Madridge Journal of Food Technology, heating honey above 60°C begins to destroy the integrity of its enzymes, particularly diastase and invertase. Staying below 40°C preserves those compounds while still being warm enough to dissolve glucose crystals.
What to Avoid
Three common mistakes cause permanent damage.
- Microwaving heats unevenly and creates hot spots above 80°C that destroy enzymes and flavour compounds irreversibly.
- Boiling water destroys virtually everything that makes raw honey different from processed sugar water.
- Leaving the jar on a hot stove pushes temperatures past safe limits if left unattended, even briefly.
Pro Tip:
If it feels comfortably warm rather than hot, the temperature is right. If you pull your hand back, it is too hot for the honey.
Know the Difference Between Crystallised and Spoiled Honey
Not every texture change means crystallisation. Knowing the difference prevents you from throwing away perfectly good honey or using honey that has actually gone off.
Signs of Crystallisation
- Grainy, thick texture that is lighter in colour than the original
- Smells and tastes exactly like honey
- Dissolves completely in warm water and returns to liquid
Signs of Fermentation
- Sour or alcoholic smell
- Acidic or off taste
- Bubbles or foam at the surface
Fermentation happens when the moisture content climbs above 20 percent, usually from repeated exposure to open air or wet utensils. Fermented honey cannot be reversed and should not be consumed. Crystallised honey is perfectly safe and returns to normal with gentle warming.
Note: At Fleures Honey, we see crystallisation as a quality indicator rather than a flaw. If your honey crystallises, it means the natural structure of the product is intact and nothing has been commercially processed out of it.
Quick Check: Is Your Storage Setup Protecting Your Honey?
Here is a fast way to check whether your current habits are helping or hurting.
- Stored at room temperature between 20°C and 25°C
- Lid sealed tightly after every use
- Dry utensil used every single time
- Jar positioned away from direct sunlight and cold walls
- Thread wiped clean so the seal stays airtight
If all five apply, your honey will stay liquid for as long as its sugar profile allows. If two or more are missing, crystallisation will arrive sooner than expected.
Does putting honey in the fridge make it crystallise faster?
Yes, the temperature inside a fridge falls right in the zone where glucose crystals form fastest. Honey should be stored at room temperature between 20°C and 25°C for the longest liquid shelf life.
Can you stop honey from crystallising completely?
Not if it is real, raw honey. Crystallisation is a natural process that happens to all honey with enough glucose content. Proper storage slows it significantly, but the only way to prevent it entirely is commercial heat treatment, which also destroys the enzymes and antioxidants that make raw honey worth buying.
Does crystallised honey lose its health benefits?
No, the nutritional profile stays the same whether the honey is liquid or crystallised. The enzymes, antioxidants, pollen, and vitamins are all still present. Only heat above 40°C begins to affect those compounds.
How many times can you decrystallise the same jar?
As many times as needed, provided the water temperature stays below 40°C each time. Repeated gentle warming does not degrade the honey.
Final Thoughts
Keeping honey from turning to sugar comes down to how you store it and how you handle it after every use. Room temperature, a sealed lid, and a dry utensil are the three habits that make the biggest difference. When crystallisation does happen, warm water below 40°C brings it back without damaging the compounds that make raw honey worth choosing over processed alternatives.
Fleures Honey has been producing 100% pure, raw, natural honey from our farm since 1985. Every batch is sampled, tested, and graded before bottling, and our honey carries Kosher and Halaal certification across the full range. Whether you are buying a jar for your kitchen or sourcing in bulk for a business, browse our full collection at and taste the difference that farm-direct makes.
