Kohatu hops for pine needles and tropical fruit

Kohatu is a fruit hop with a forest floor

Kohatu comes from the New Zealand breeding programme run by the government research institute now called Plant and Food Research. It reached brewers in the early 2010s and has stayed a niche variety ever since, which is a pity. Most New Zealand hops are known for white wine and passion fruit. Kohatu is sold on pine needles.

The pine here is not the sticky, resinous pine of the classic American hops. It is greener and fresher, closer to crushed needles than to sap. Underneath sits tropical fruit, mostly pineapple with some lime and a floral edge. Alpha acids are moderate, usually in the mid single figures on supplier sheets, so this is an aroma hop first. You would not bitter a beer with it unless you had nothing else.

Late additions carry the character

Almost everything that makes Kohatu interesting lives in its essential oils. Those oils are volatile. Boil it for 60 minutes and you get mild bitterness with very little personality. Put it in at flameout or in a whirlpool and the picture changes.

For a 20 litre homebrew we would use Kohatu in two places:

• A whirlpool addition of 40 to 60 g, with the wort cooled to around 75 to 80 °C before the hops go in. Hold for 20 minutes, then chill.
• A dry hop of 60 to 100 g (3 to 5 g per litre) once primary fermentation is close to finished.

Cooling before the whirlpool matters. Above about 85 °C you isomerise more alpha acid and drive off more of the lighter oils. You get a harsher, less fragrant beer for the same weight of hops.

Where the pine comes from

Hop aroma is built mostly from a handful of oil compounds. Myrcene gives the green, resinous, sometimes piney lift that you smell when you rub a fresh pellet. Linalool and geraniol give floral and citrus notes. Kohatu seems to balance these in a way that reads as pine and fruit together. Our guide to hop oil chemistry explains which compounds survive which part of the process.

The practical point is that myrcene is the most volatile of the main oils. It boils off fast and is easily scrubbed out by vigorous fermentation. If the pine disappears from your beer, a hot whirlpool or a dry hop added during the most active part of fermentation is the usual cause.

Beers that suit Kohatu

Kohatu works best where the malt stays out of the way. A pale ale built on 90% pale malt with a little wheat or light crystal lets the pine and pineapple show. It also suits a session IPA at around 4.5% ABV, where a big hop presence keeps a thin beer interesting.

It pairs well with hops that bring brighter fruit. Try it alongside a citrus or passion fruit hop such as Strata. A 50:50 dry hop gives you pine on the nose and juicier fruit on the palate. Kohatu on its own can seem a little narrow in a strong double IPA, where the malt and alcohol swamp its gentler side.

Using it in an Indian kitchen brewery

New Zealand hops reach India in small lots, usually as T90 pellets in nitrogen flushed foil. Kohatu is rarer still, so when you find it, buy what you will use within a few months. Hop aroma fades fast at room temperature. In a Mumbai or Chennai summer, a pack left on a shelf at 32 °C will lose much of its oil within weeks.

Store sealed packs in the freezer, below 0 °C. After opening, squeeze out the air, fold the foil tight and tape it, then return it to the freezer. Weigh out what you need quickly and keep the rest cold. A hop that smells of cheese or wet cardboard has oxidised. It will still bitter a beer, but the pine is gone.

Learning a hop the honest way

The best way to learn Kohatu is a single hop beer. Brew a simple pale ale at around 1.048 OG with 20 IBU from a clean bittering hop. Use Kohatu for every late and dry hop addition. Taste it fresh, then again at two and four weeks. You will learn what the hop does and how quickly its pine fades in your own setup.

Tasting tells you what happened. Understanding why it happened is harder: which oils survived the whirlpool, how fermentation temperature shifted them and why the same weight of hops gave a different beer last time. That is the part most homebrewers never get taught.

So start with one bag. Brew that single hop pale ale this month and keep a tasting note at each stage. It will teach you more about Kohatu than any spec sheet.

Common questions

What does Kohatu taste like?

Fresh pine needles first, then tropical fruit such as pineapple with some lime and floral notes. The pine is green and fresh rather than resinous.

Can I use Kohatu for bittering?

You can, but its alpha acids are moderate and its value lies in its aroma oils. Use a clean, high alpha hop for bittering and save Kohatu for the whirlpool and dry hop.

How much Kohatu should I dry hop with?

For a 20 litre pale ale or IPA, 3 to 5 g per litre is a good starting range, so 60 to 100 g in total.

What hops pair well with Kohatu?

Hops with brighter citrus or passion fruit character work well beside it, because they fill out the fruit while Kohatu brings the pine.