If you've opened your honey jar to find it thick, cloudy or grainy, don't throw it away. Crystallisation is a completely natural process, and crystallised honey is still good to eat. It happens because honey holds more sugar than it can keep dissolved, so over time some of that sugar settles out as tiny crystals. A gentle warm-water bath turns it runny again in minutes.
Here's what's actually going on inside the jar, why some honeys set faster than others, and the easiest ways to bring yours back to a smooth pour.
Why does honey crystallise?
Honey is mostly two natural sugars, glucose and fructose, dissolved in a small amount of water. In fact, it contains far more sugar than that little bit of water can comfortably hold. Scientists call this a supersaturated solution, and solutions like that are naturally unstable.
Glucose is the less soluble of the two sugars. Over time it separates from the water and forms small crystals. Once a few crystals appear, they act as "seeds" for more, and the honey gradually turns from clear and runny to cloudy, thick and eventually firm. Fructose stays dissolved, which is why partly crystallised honey often has a liquid layer on top and a set layer at the bottom.
Tiny particles in the honey, such as pollen grains or fine bits of wax, give the crystals something to form around, so they can speed things up too.
Is crystallised honey still good to eat?
Yes. Crystallised honey hasn't spoiled, gone off or "turned into sugar" in a bad way. It's the same honey with the same flavour, just in a different texture. Plenty of people actually prefer it set: it spreads on toast like butter, doesn't drip off a spoon and is lovely stirred into warm porridge.
It's also worth clearing up two common myths:
- Crystallisation doesn't mean honey is fake. Natural honey crystallises all the time.
- Staying runny doesn't mean honey is better. Some honeys simply have more fructose and stay liquid for much longer.
The one thing to watch for is different from crystals. If honey smells sour or yeasty, looks foamy or bubbly, or has a watery layer that tastes fermented, it has probably absorbed moisture. That's usually caused by a lid left loose or a wet spoon, so keep the jar tightly closed and use a clean, dry spoon or dipper.
Why do some honeys crystallise faster than others?
Every honey is different, because it depends on the flowers the bees visited. A few things decide how quickly a jar sets:
- The sugar balance. Honeys with more glucose, such as clover, canola and many wildflower honeys, tend to crystallise sooner. Honeys higher in fructose, such as acacia, can stay runny for a long time.
- Temperature. Honey crystallises fastest in cool conditions, roughly 10 to 15°C. That's why the fridge is the quickest way to turn honey solid.
- Moisture. Honey with a little less water tends to crystallise more readily.
- Particles. Pollen and fine wax particles give crystals a place to start.
In Singapore's warm climate, honey kept in a kitchen cupboard usually stays liquid for a good while. A jar kept in a cold, air-conditioned room or in the fridge will often set much sooner.
How to make crystallised honey runny again
The key is gentle, even warmth. You want to dissolve the crystals without overheating the honey, because strong heat can dull its delicate aroma and flavour.
1. The warm-water bath (best method)
- Make sure the lid is on tightly.
- Stand the jar in a bowl or pot of warm water, roughly as warm as a comfortable bath (around 40°C). Never use boiling water.
- Keep the water level below the lid so none gets into the honey.
- After 10 to 15 minutes, open the jar and stir with a clean, dry spoon or a wooden honey dipper.
- Top up with warm water and repeat until the crystals have dissolved.
This works well for glass jars. If your honey is in a plastic container, scoop what you need into a heatproof glass bowl first.
2. Small amounts for today
If you only need a spoonful, take it out and stir it straight into warm tea, warm milk or porridge. It'll melt in on its own, with no need to warm the whole jar.
3. A word on the microwave
We don't recommend it. Microwaves heat unevenly, so parts of the honey can get very hot while other parts stay solid. If you do use one, take the lid off, use a microwave-safe container and warm it in short bursts of a few seconds, stirring in between.
How to slow crystallisation down
- Keep honey at room temperature in a cupboard or pantry, away from direct sunlight and the stove.
- Skip the fridge. Cold speeds crystallisation up rather than slowing it down.
- Close the lid tightly after each use to keep moisture out.
- Use a clean, dry spoon every time. If you've been wondering whether the material matters, our post on whether you should use a metal spoon with honey has the answer.
For more everyday tips, read our guide on how to store honey properly.
Ways to enjoy honey that has already set
Before you rush to re-liquefy it, try crystallised honey as it is:
- Spread it thickly on warm toast or a fresh croissant.
- Stir it into overnight oats or yoghurt.
- Use it in baking, where it melts into the batter anyway.
- Pair it with cheese and crackers for an easy grazing platter.
A runny clover honey, like our clover honey, is a handy everyday jar to keep in the kitchen for drizzling, baking and drinks.
Giving honey as a gift?
If you're giving honey to friends, guests or colleagues, a quick note that crystals are natural (and how to warm the jar) is a thoughtful touch. Browse our honey jar designs for mini jars wrapped for every occasion, each filled with natural, halal-certified honey.
Frequently asked questions
Is crystallised honey safe to eat?
Yes. Crystallisation is a natural change in texture, not a sign of spoilage. The honey tastes the same and can be eaten as it is or gently warmed until runny.
Does crystallised honey mean it has gone bad?
No. Honey that has gone off usually smells sour or looks foamy because it has taken on moisture. Crystals on their own are perfectly normal.
Can I put honey in the fridge?
You can, but there's no need, and it makes honey crystallise much faster. A cool, dry cupboard at room temperature is best.
Can I melt crystallised honey more than once?
Yes, but try to warm only what you'll use soon, and always use gentle heat. Repeated strong heating can affect the honey's flavour and aroma.
Why is my honey runny on top and solid at the bottom?
That's partial crystallisation. The glucose crystals sink and the fructose-rich liquid stays on top. Stir it after a warm-water bath and it'll come back together.