New Zealand cherries are known for their deep colour, rich flavour and premium quality. A major reason is the distinctive growing environment found in regions such as Central Otago.

There is no single factor that makes these cherries unique. Instead, it is a combination of long summer days, abundant sunlight, warm daytime temperatures, cool nights and a dry climate.

Scientific research into sweet cherries has shown that both light and temperature can influence fruit colour, anthocyanin development and sugar accumulation.[1][2]

Quick answer: What makes New Zealand cherries unique?

Central Otago’s cherry-growing environment is characterised by:

• Long daylight hours during summer
• High exposure to natural sunlight
• Warm, dry days
• Cool nights
• Large differences between daytime and nighttime temperatures
• Low rainfall
• Ripening during the height of the southern summer

Together, these conditions create a distinctive environment for growing premium sweet cherries.

1. Exceptionally long summer days

Central Otago sits at approximately 45° south latitude.

Around the December summer solstice, the region experiences close to 16 hours between sunrise and sunset.

This gives cherry trees a long period of natural daylight during an important stage of growing and ripening.

Long daylight does not necessarily mean more intense sunlight throughout the entire day, but it provides an extended window for photosynthesis and fruit development.

2. Sunlight helps cherries develop colour

Sunlight is important not only for photosynthesis but also for the development of cherry colour.

Red and dark cherries contain natural pigments called anthocyanins, which are responsible for much of their red, purple and dark colouring.

Research involving sweet cherries has shown that light exposure can significantly influence anthocyanin accumulation and fruit colour.[1]

In one study, shaded cherries developed lighter colouring and lower anthocyanin concentrations than cherries receiving normal light exposure.[1]

This suggests that good exposure to natural sunlight plays an important role in helping cherries develop their characteristic colour and pigmentation.

3. Central Otago is sunny and remarkably dry

Central Otago has a very different climate from the lush conditions often associated with New Zealand.

Its inland location and surrounding mountain ranges create a dry, continental climate with relatively low rainfall and high sunshine hours.

Central Otago regularly records more than 2,000 hours of bright sunshine each year, while Alexandra is among New Zealand’s driest locations.[3]

For cherries, this means the growing and ripening season often coincides with long periods of dry, sunny weather.

4. Warm days and cool nights create an ideal balance

One of Central Otago’s most distinctive characteristics is the difference between daytime and nighttime temperatures.

Summer afternoons can exceed 30°C, while temperatures often fall considerably after sunset. This creates a large diurnal temperature range.

Research into sweet-cherry ripening suggests this balance can be important.

One controlled study compared cherries grown at:

24°C during the day / 14°C at night

with cherries grown at:

34°C during the day / 24°C at night.

The fruit grown under the more moderate temperature conditions accumulated substantially more anthocyanins and greater levels of soluble sugars.[2]

This suggests that cherries benefit from warmth and sunlight, while excessive heat during ripening can work against colour and sugar accumulation.

Cooler nights may also help by reducing plant respiration, meaning less of the carbohydrates produced during the day are used overnight.

Central Otago’s pattern of warm, sunny days followed by cool nights therefore creates favourable conditions for cherry ripening.

5. A dry climate is well suited to cherries

Rain can be a major risk for cherries as they approach harvest.

Excess rainfall can contribute to fruit cracking and increase disease pressure.

Central Otago is one of New Zealand’s driest regions, with surrounding mountains creating a strong rain-shadow effect.[3]

The relatively dry climate gives growers greater control over water through irrigation and reduces the frequency of wet conditions during the ripening and harvest period.

6. Ripening at the height of summer

Central Otago cherries typically ripen through December and January, with later varieties extending beyond this period.

This means the final stages of ripening coincide with:

• Some of the longest days of the year
• High levels of natural sunshine
• Warm daytime temperatures
• Relatively cool nights
• Generally dry summer conditions

These conditions occur at the stage when cherries are developing much of their final colour, sugar and flavour.

So what really makes New Zealand cherries unique?

There is no single secret to a great cherry.

Fruit quality depends on variety, soil, orchard management, irrigation, sunlight, temperature, rainfall and harvest timing.

What makes Central Otago distinctive is the way these conditions come together: long summer days, abundant natural sunlight, warm afternoons, cool nights and a remarkably dry climate.

Scientific research supports the importance of several of these factors. Light exposure can promote cherry colour and anthocyanin accumulation, while excessively high temperatures during ripening can reduce both anthocyanin and sugar accumulation.[1][2]

It is this balance of light, warmth, cool nights and dry conditions that makes Central Otago such a distinctive place to grow cherries.

Frequently Asked Questions

Why are New Zealand cherries unique?

New Zealand cherries, particularly those grown in Central Otago, benefit from long summer days, abundant sunlight, warm daytime temperatures, cool nights and a dry inland climate.

Does sunlight affect cherry colour?

Yes. Research in sweet cherries has shown that fruit receiving less light can develop lower concentrations of anthocyanins and lighter colouring.[1]

Why are cool nights important for cherries?

Research suggests that excessively high temperatures during ripening can reduce anthocyanin and soluble sugar accumulation.[2] Cooler nighttime conditions can therefore form part of a favourable ripening environment.

How long are summer days in Central Otago?

Around the December summer solstice, Central Otago experiences close to 16 hours between sunrise and sunset.

Why is dry weather good for cherries?

Rain close to harvest can contribute to fruit cracking and disease pressure. Central Otago’s dry climate helps reduce these risks.

From Central Otago to Eden Orchards

Central Otago has been part of Eden Orchards for more than 30 years, and knowing the growers and orchards our fruit comes from remains an important part of how we make our juice today.

We source ripe cherries from Central Otago orchards close to our factory in Alexandra. During harvest, we collect the fruit in our own trucks and have it juiced and bottled within 48 hours of collection.

Keeping that journey short means we can work with the cherries while they are at their best and preserve the colour, flavour and quality of the fruit in every bottle.

Our Pure Cherry Juice is made from 100% New Zealand cherries, with no added sugar, colours, flavours or preservatives.

References

[1] Light exposure and anthocyanin development in sweet cherries
Frontiers in Plant Science. Research examining the effect of light exposure and shading on anthocyanin biosynthesis and colour development in sweet cherry fruit.

[2] Temperature, anthocyanin development and sugar accumulation in sweet cherries
Frontiers in Plant Science. Research examining how different temperature regimes affect anthocyanin biosynthesis, fruit colouring and soluble sugar accumulation during sweet-cherry ripening.

[3] Central Otago climate and historical climate information
NIWA / Earth Sciences New Zealand.