Why Does Honey Crystallise? And Is It Still Good?
Honey crystallises because the glucose in it naturally wants to form solid crystals — it's a supersaturated sugar solution, and crystallisation is the stable state. It does not mean the honey is old, bad, or spoiled. Crystallised honey is perfectly good. The speed of crystallisation depends on the ratio of glucose to fructose: high-glucose honeys crystallise fast, high-fructose honeys (like Jarrah) resist it naturally.
Key Points
- Crystallisation is a normal physical property of honey — not spoilage
- Glucose crystallises; fructose does not. The ratio determines how fast a honey sets
- High-fructose Jarrah honey is naturally resistant to crystallisation — this is the science behind the Crystallisation-Free Guarantee™
- You can safely reliquefy crystallised honey using a warm water bath under 40°C — higher temperatures destroy bioactive enzymes
Open a jar of honey that's been sitting in the pantry for a few months and you might find something that looks more like thick white paste than golden liquid. Many people assume this means the honey has gone bad, gone stale, or was of poor quality to begin with.
The truth is the opposite. Crystallisation is a sign of real honey — one that hasn't been heavily heat-treated to artificially delay the natural process. Understanding why it happens tells you a lot about honey chemistry, why some honeys set and others don't, and what to do with a jar that's seized up.
The Chemistry: Why Honey Crystallises
Honey is a supersaturated sugar solution. That means it contains more dissolved sugar than water can normally hold at room temperature — it's in an unstable equilibrium. Over time, the unstable solution moves toward a more stable state: the sugars begin to precipitate out of solution and form crystals.
The two dominant sugars in honey are glucose and fructose — and they behave completely differently.
Glucose has low solubility in water. At the concentrations found in honey, it readily forms crystals, especially when a nucleus is available (a tiny pollen grain, a wax fragment, or even an existing crystal gives the process somewhere to start). Once crystals begin forming, they grow and recruit more glucose molecules — and the process accelerates.
Fructose has much higher water solubility and does not crystallise under normal conditions. It stays in solution even as the glucose crystallises around it.
This means the fructose-to-glucose ratio of a honey is the single most important predictor of how quickly it will crystallise.
Why Different Honeys Crystallise at Different Rates
Here's how it plays out across common honey types:
| Honey Type | Glucose:Fructose Ratio | Crystallisation Speed |
|---|---|---|
| Canola (rapeseed) | High glucose | Very fast — can set in weeks |
| Clover | Balanced | Moderate — weeks to months |
| Yellow Box | Moderate glucose | Moderate |
| Manuka | Moderate | Moderate to slow |
| Jarrah | High fructose | Very slow to none |
| Leatherwood | High fructose | Slow |
Canola honey is notorious for setting rock-hard very quickly — some jars are solid within 2–3 weeks of packing. It's fine to eat, but requires warming before use. At the other end, Jarrah honey's exceptionally high fructose content means the glucose is present in such small relative proportions that crystallisation barely gets started under normal storage conditions.
This isn't a processing difference. It's not about filtration or heating. It's the natural chemistry of the nectar Jarrah trees produce — transferred faithfully into the honey when bees process that nectar with minimal intervention.
The Crystallisation-Free Guarantee™: Science, Not Marketing
Most premium honey producers face the same dilemma: crystallised honey doesn't look appealing on a shelf. The standard industry solution is heat — warming honey to 60–70°C makes crystals dissolve and delays their return, sometimes for months.
The problem is that heat above 40–50°C degrades the very properties that make bioactive honey valuable. Glucose oxidase (the enzyme responsible for peroxide antimicrobial activity) denatures at elevated temperatures. Diastase content drops. Heat-sensitive phenolic compounds break down. The honey looks better but functions less well.
Forest Fresh Honey doesn't use this approach for Jarrah. Instead, the Crystallisation-Free Guarantee™ on Jarrah Platinum TA50+ is built directly on Jarrah honey's natural chemistry. The honey doesn't crystallise because it genuinely doesn't want to — not because it's been heated into compliance.
This matters more than it sounds. It means the Jarrah Platinum in your jar has the same enzyme content, the same TA50+ rating, the same bioactive profile it had when it was packed. The guarantee isn't a promise to replace a seized jar. It's a statement that the natural properties of genuine Jarrah honey make crystallisation in normal storage conditions essentially a non-event.
🍯 Jarrah Platinum TA50+ — naturally stays liquid, independently tested, Crystallisation-Free Guarantee™. Shop Jarrah Platinum →
Is Crystallised Honey Still Good?
Yes. Unequivocally.
Crystallisation changes the texture and appearance of honey — it does not affect the safety, flavour (in most cases), or bioactivity. Crystallised honey contains exactly the same compounds as liquid honey; they've just reorganised physically.
In some traditions, crystallised honey is preferred. It spreads like butter on toast. It doesn't drip. The flavour is often described as slightly richer or more complex. "Creamed honey" — which is intentionally crystallised honey worked to a fine, smooth texture — is a popular format precisely because of these qualities.
If you have a jar of crystallised honey that you'd prefer liquid, here's how to do it without damaging anything:
Safe reliquefying method: 1. Place the closed jar in a bowl or pot of warm water 2. Keep the water temperature at or below 40°C — comfortable to hold your hand in 3. Wait — this can take 30–60 minutes for a fully crystallised 500g jar 4. Stir gently once crystals have dissolved 5. Use immediately or allow to cool before resealing
What to avoid: - Microwaving (temperature spikes are uncontrolled and often exceed 60°C locally) - Placing in boiling water or on a stovetop - Prolonged low heat (extended exposure even below 45°C gradually affects enzyme content)
The goal is slow, gentle warming — and it works perfectly well. The honey will be exactly as bioactive as it was before crystallisation.
Why Some Honey Never Crystallises in the Jar (Without Heat Treatment)
You might notice that some honey jars on shelves seem to stay liquid for months or years. In most cases, this is because the honey has been:
- Heated — pasteurised at 60–70°C during packing, which dissolves crystals and temporarily delays their return
- Ultra-filtered — fine filtration removes the pollen grains and wax fragments that act as crystal nuclei, slowing onset
- Blended — mixed with high-fructose corn syrup or other adulterants (a concern primarily in imported honeys)
None of these approaches preserves bioactivity. They're aesthetic solutions to a non-problem — because crystallised honey is fine.
Jarrah honey is the rare exception that remains genuinely liquid without any of these interventions. Its natural fructose dominance simply leaves too little free glucose to form a meaningful crystal network under normal conditions. You're not trading bioactivity for shelf presentation. You're getting both.
Frequently Asked Questions
Q: Does crystallised honey go bad? A: No. Crystallisation is a physical change, not a chemical spoilage event. Crystallised honey is safe to eat, retains its flavour, and maintains its bioactive properties. It will not spoil in a sealed container regardless of how long it has been crystallised.
Q: Why did my honey crystallise so quickly? A: High-glucose honeys (canola, clover, many eucalyptus blends) crystallise fast — sometimes within weeks of packing. This is a natural property of those honeys and doesn't indicate anything wrong. If your honey crystallised unusually fast and you're expecting it to be a slower variety, check the floral source — it may be a blend.
Q: Can I tell if honey has been heat-treated? A: Not easily at home. One indicator is diastase activity — labs test for this enzyme as a proxy for whether honey has been overheated. The EU honey standard requires a minimum diastase number of 8 (on the Schade scale). Very low diastase readings indicate heat processing. For Forest Fresh Honey Jarrah, diastase levels are tested as part of the five-laboratory validation process.
Q: Is creamed honey different from crystallised honey? A: Creamed honey is intentionally crystallised honey that's been worked to a fine, spreadable texture by controlling the temperature and seeding with fine crystals. The process produces a smooth, consistent product. It's still fully natural honey — just in a manufactured crystalline form. The underlying chemistry is the same.
Q: Why do supermarkets sell honey that never crystallises? A: Most supermarket honey has been pasteurised and/or ultra-filtered, which delays crystallisation significantly. Ultra-filtration removes pollen grains (the main crystal-nucleating particles), and heat dissolves any existing crystals and slows new ones from forming. The honey looks better on a shelf for longer — but at the cost of bioactivity.
Q: Does Jarrah Platinum ever crystallise? A: Under normal storage conditions, Jarrah Platinum TA50+ does not crystallise — this is the basis of the Crystallisation-Free Guarantee™. The high fructose-to-glucose ratio of genuine Jarrah honey makes it naturally resistant. In extreme cold (refrigerator temperatures), some slight haze or thickening may occur, but there's no reason to refrigerate honey — room temperature storage is ideal.
Q: Is warming honey to put it in tea or food okay? A: Adding honey to warm food or warm (not boiling) liquid is fine for general eating. If you're adding honey specifically for its bioactive properties, allow hot drinks to cool slightly before adding honey — temperatures above ~50°C will begin to reduce the enzyme content. A warm (not boiling) cup of water or herbal tea is a reasonable carrier for bioactive honey.
The information in this article is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease or health condition. Please consult your healthcare professional before using honey as part of a health or medical regimen. Forest Fresh Honey products are food products, not medicines. Not suitable for children under 12 months. These statements are based on traditional use and emerging scientific research.
Written by Matt Fewster, 5th generation of the Fewster family and co-founder of Forest Fresh Honey.
Sources: - Irish, Blair & Carter (2011), PLOS ONE — Antibacterial activity of WA honey: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0018229 - Arcot & Brand-Miller (2005), RIRDC — Low GI and fructose-glucose ratios in Australian honey: https://www.agrifutures.com.au/wp-content/uploads/publications/05-027.pdf - Manning, Dr Rob (2011), WA DPIRD — WA honey properties: https://library.dpird.wa.gov.au/pubns/39/
