D28 durian butter king

Every few weeks a customer tells me they want a durian that will not fight them, something rich and smooth for a first date with the fruit, and more often than not I point them at D28. This is the clone the Malaysian trade sells as Butter King, written 奶油王 on the stall signs, and also called the Creamy Bun for the way its flesh folds thick and soft. It is Durio zibethinus in the Malvaceae family, same as any durian, and it comes out of Seremban in Negeri Sembilan.

Texture is the reason the name stuck. The flesh runs thick and dense, velvety enough that a ripe lobe collapses on the tongue with almost no chew. On our Exotic Fruits and Vegetables benches I keep a grafted D28 beside a Musang King so visitors can compare the leaf, though neither tree will ever fruit in a San Diego winter. What people come for is the eating, and that is where D28 gets complicated.

Reading the Butter King

Here is the honest part most sellers skip. The same clone gets sold as mild and sweet in city markets, yet eats dark and bitter off old Seremban trees, which means the D28 in your hand can be two different experiences. Retail stalls lean on the sweet, beginner-friendly version, while durian specialists prize an older-tree D28 that turns bitter with red-wine and cocoa notes closer to Black Thorn.

The physical fruit is easier to pin down. D28 is round with a slightly convex top and base, and the spikes are rounded and moderately spaced, so it looks less menacing than a Musang King. Cut it open and the flesh is lemon to golden yellow, thick and glossy, with a dairy-like aroma that stays moderate rather than filling the whole kitchen.

One trait every source agrees on is the texture. Whether a given D28 comes out sweet or bitter, the flesh stays buttery and fine-grained, with little of the stringy fiber that lesser clones carry. That consistency is what earns it shelf space even against flashier names.

Seeds are the catch. Many D28 carry large seeds, and a heavy fruit with big seeds yields less edible flesh than its weight promises, which matters when stalls price by the kilogram with the husk still on. Retail sellers moving pulp-only boxes will claim small seeds, so the picture you get depends on who is selling.

This is the profile I run through before anyone pays.

Do you know whether you are buying the sweet Butter King or the bitter old-tree version before you hand over your money? Ask the seller which trees the fruit came off, and if they cannot answer, treat the sweetness as a coin toss.

When someone wants to spot a D28 in a mixed pile, I give them these cues:

• Round fruit with a gently domed top and bottom
• Rounded, moderately spaced spikes rather than sharp close ones
• Lemon to golden-yellow flesh once opened
• A softer, dairy-like smell instead of a sharp garlic hit

Growing it, and where the butter comes from

D28 asks for the same tropical setup as any durian, and the demands are not negotiable. The tree wants mean temperatures of 24 to 30 C, humidity around 75 to 85 percent, and 1,500 to 2,500 millimeters of rain across the year, followed by a dry spell of two to four weeks to trigger flowering. Below a mean of 22 C it simply stops growing.

Soil is where the buttery texture is won or lost. Durian needs deep, well-drained loam at pH 5.5 to 6.5, and the creaminess D28 is famous for leans on steady nutrition through fruit fill, since a starved tree throws thin, watery lobes. Potassium in particular drives the richness that buyers are paying for.

Feed potassium hard during fruit development if you want the buttery result. Growers who switch to a high-potassium blend once fruit sets get denser, creamier flesh than those running a flat balanced feed all season.

A grafted D28 fruits in four to six years and wants 30 to 40 feet of space, six or more hours of sun, and shelter from wind that snaps the brittle limbs. Dialing in the fertilizer rate for a tree of a given age and soil test is the difference between a buttery crop and a bland one. The tool below works out a durian feeding program from tree size and soil readings.

My own attempt at D28 has stayed stubbornly leafy. The grafted tree in my heated house has held for four years without a single flower, because I cannot fake the two-week dry trigger inside a humid poly tunnel. That experiment has cost me roughly 300 dollars a winter in heating, and the closest I have come to butter is the leaf it sheds on the floor.

Never let these roots sit wet. Durian feeder roots run within about 30 centimeters of the surface, and a waterlogged week invites Phytophthora root rot that can drop a young tree before it fruits.

Do you have a genuine dry spell in your climate, or only steady humidity? Without that pause the tree grows lush and flowers never, which is how most greenhouse durian projects, mine included, quietly stall.

Choosing and eating one

For nearly everyone the answer is to buy D28, not grow it. In season from June to August the Butter King shows up across Malaysian markets, priced as a mid-tier vintage clone rather than a top-tier fruit. It sits well under Musang King, which runs from RM50 to over RM100 per kilogram in a normal year, so it makes an easy fruit for a beginner budget.

Because durian folk keep comparing D28 to Black Thorn, here is how the two actually differ.

At its best, a well-grown D28 is one of the easiest luxury durians to love. The lobe I ate in Seremban two seasons back was pale gold, dense as chilled custard, and sweet without the alcohol burn that scares off newcomers. For the money, few clones give a smoother first bite.

Checking a Butter King at a stall, I move in a fixed order:

1. Lift it and judge whether the weight is flesh or just big seeds and husk
2. Look for lemon to golden-yellow lobes when the seller cuts it
3. Smell for a soft dairy note rather than sharp fermentation
4. Press a lobe for that dense, springy give
5. Ask which trees it came from if you care about sweet versus bitter

The disappointment I see most often is a buyer paying by weight for a fat D28 and getting a boxful of big seeds. On this clone, heavy does not mean generous, and an unscrupulous stall knows it.

This is a rich fruit, and richness carries a cost your body notices. Durian is calorie-dense to begin with, and a buttery clone like D28 eaten by the lobe adds up fast, which is worth knowing if you track intake. The tool below estimates calories and nutrition from the amount of flesh you eat.

What I tell a first-timer

Reach for D28 if you want a durian that rewards you without a fight, creamy and mild off younger trees, richer and more bitter off old ones. Buy it in season, weigh the heft against those large seeds, and ask the seller about the source if sweetness matters to you. Growing your own stays a tropical project, and even under glass this butter is a promise rather than a harvest.