XO vs D24 Durian: Same Clone, Different Handling

Same clone, different handling

Start with the fact that settles the whole comparison: XO is not a separate durian. It is D24, the clone registered in 1937 as Sultan, left on the tree past its normal drop point until the flesh begins to ferment before the fruit falls. There is no XO entry on Malaysia’s Department of Agriculture clone register, because XO describes something that happens to an existing clone, not a clone in its own right.

That reframes the whole “XO vs D24” question. You are not choosing between two durians. You are choosing between D24 harvested at its normal point, and fruit from the same tree held back for longer. Every difference below follows from that one decision about timing, not from any difference in genetics. The reference entries for D24 and XO cover the spotting details side by side, if you want to check a specific claim.

What longer fermentation actually changes

Leaving a durian on the tree past its normal drop point lets it keep ripening after the sugars have already peaked. Some of that sweetness starts converting, and the flesh picks up the sharp, boozy note that gives XO its name, a term borrowed from cognac’s ageing grade rather than anything to do with the fruit itself.

On this site’s bitterness scale, standard D24 sits at 2 out of 5: balanced, leaning sweet, with a gentle bitter edge that fades quickly. XO sits at 4, among the sharpest fruit on the register. Texture shifts as well. Standard D24 is thick and custard-like. Held longer, the same flesh turns softer and noticeably wetter, sometimes distinctly watery rather than creamy. Plenty of eaters find that texture change as off-putting as the extra bitterness.

None of this is subtle side by side. Genuine XO next to genuine D24 from the same batch should taste and feel different enough that nobody would mix them up, which is itself a useful check on whether what you are being sold is real.

Why a shop charges differently for the same fruit

If XO and D24 are the same clone, the price gap needs an explanation other than “better variety,” and there is one. Every extra day a durian stays on the tree is a day it can be lost, to wasps, squirrels, birds, rot, or simply falling before anyone is there to collect it. A farmer producing XO on purpose is accepting a higher loss rate for a fruit some buyers will pay more for.

Fermentation is also uneven. Two fruits from the same tree, held the same number of days, can come out mildly tart or aggressively alcoholic, so a seller cannot promise a consistent result the way they can with fruit picked at a known ripeness. Once opened, XO’s wetter flesh also spoils faster, meaning more waste for anyone holding stock. Where the premium is honest, it pays for that waiting risk and failure rate, not for a rarer genetic line. There is no clone-level scarcity behind it, because there is no separate clone.

The D2 mislabelling, and why it is not a minor error

A second, unrelated mistake compounds the first. XO is routinely sold under the label “D2,” which is not a shorthand but a real, separate, registered clone: Dato Nina. It is easy to see how one becomes the other. Drop a digit from “D24” and “D2” is what is left, and once a wrong label is on a signboard, the next seller tends to copy it rather than check it.

This matters for two reasons beyond plain accuracy. First, anyone who searches for “D2 durian” to check what they are being sold will find a mild, sweet, low-bitterness fruit, since that is genuinely what Dato Nina is, and will arrive expecting something nothing like the strong, alcoholic fruit in front of them. Second, a made-up D number on XO reinforces the idea that it is a distinct premium clone with its own registration, which is exactly the misunderstanding this comparison exists to correct. If a stall puts any D number on XO, treat that as a sign about the stall, not about the fruit.

How to tell you are buying real fermented D24, not a sticker

Because “XO” has no legal definition and no register to check it against, the name on its own tells you nothing. A few checks do more work.

Ask directly how long the fruit was left, and whether it fermented on the tree or was simply held after picking. A seller who cannot answer either question is guessing, or hoping you will not ask.

Open it before buying, if the stall allows it. Genuine tree-fermented D24 is soft and noticeably wet. If a fruit sold as XO opens firm and dry, closer to standard D24’s texture, it has not been fermented long enough to earn the price, whatever the sign says.

Use your nose. A properly fermenting durian pushes its aroma out through the base, and the smell test in our stall-checking guide applies directly here: sharp, sour or alcoholic at the base is exactly what you want if you are deliberately buying XO, and exactly what should make you pause if you are not.

Compare the price against plain D24 that same week. A modest premium for the wait and the loss rate is reasonable. A large one, on a fruit that is genetically identical to the D24 sitting next to it, is a story being sold along with the fruit.

Who should buy which

D24 first, if you are unsure. It is the fruit itself: creamy, balanced, mildly bitter, and the safer choice if you have never tried either. If you end up not enjoying it, you have at least paid the baseline price for a well-regarded classic clone rather than a premium on top of it.

XO only if you already know you like strong bitterness and want it pushed further, and ideally after you have tried standard D24 so you have something to compare it against. Buying XO as a first durian risks judging the whole fruit by its most extreme version.

Related

• D24 in full: the 20 cent sign and how to spot it
• XO in full: fermentation, aroma and who it suits
• Every registered clone on the Malaysian D-number system
• How to choose durian at the stall
• More head-to-head durian comparisons