How to prune haskaps

Prune haskaps in late winter or early spring, while the bush is still dormant and before the buds swell. Wait until a plant is about 4 years old, then each year cut out the oldest, darkest branches at the base. Remove no more than 25% of the bush in one year, which works out to about 1 in every 4 to 6 branches. Haskaps fruit on one-year-old wood, so keep as much of last summer’s growth as you can.

That is the short version. The rest of this guide covers how fruiting wood works, what to do at each age, how to bring an old bush back, the tools to use, and the mistakes that cost you berries. It draws on guidance from the University of Saskatchewan fruit program (which bred ‘Tundra’, ‘Borealis’, and the Boreal and Indigo series), the Ontario ministry of agriculture, and several extension services.

Haskap pruning at a glance

Question	Short answer
When to prune	Late winter to early spring, while dormant
When to avoid	Late summer and early fall
Age to start regular pruning	About 4 years after planting
Most to remove in one year	25% of the bush
Branches to remove	About 1 in 4 to 1 in 6, cut at the base
Wood that bears fruit	One-year-old wood (last summer’s growth)
Fix for an old, worn-out bush	Cut it to about 6 inches (15 cm) and let it regrow
Mature size	About 4 to 7 feet (1.2 to 2 m) tall

Do haskaps need pruning?

Haskaps need only light pruning. The University of Saskatchewan gardening page calls for “occasional, light pruning” to keep the shrub productive. Haskaps (Lonicera caerulea) grow into a rounded shrub about 4 to 7 feet (1.2 to 2 m) tall and about 4 feet (1.2 m) wide. They do not tend to sucker.

Even so, an unpruned bush gets thick over time. The center fills with old branches. Light and air can’t reach the inside. Low branches bend toward the ground, where berries get dirty and are hard to pick.

Light pruning helps in four ways:

• It lets in sunlight for more even ripening.
• It improves air flow, which can cut down on fungal disease.
• It keeps young, productive wood coming from the base.
• It lifts the fruit off the ground so harvest is easier.

The Yukon government haskap guide lists the first three of these benefits. The Ontario ministry adds harvest ease and fruit quality.

How haskap fruiting wood works

Haskaps flower and fruit on wood that grew the summer before. The Ontario ministry’s pruning basics put it this way: “Haskaps fruit on one-year old wood.”

Here is the yearly cycle. Montana State University Extension reports that a haskap can grow 12 to 18 inches (30 to 45 cm) of new green shoots in a season. Those shoots darken as summer goes on. The next spring, that same wood blooms and sets fruit.

This has two effects on how you prune:

• Don’t trim the tips. The new shoots at the ends of branches hold next year’s flower buds. Shearing the outside of the bush removes the crop.
• Remove old wood, not young wood. Old branches still carry some fruit on their side shoots. But they grow less new wood each year. Cutting a few of them out at the base makes room for strong new shoots.

On a dormant bush, the oldest stems are the thickest, darkest ones near the center. Last summer’s shoots are thinner and sit toward the outside and top of the bush.

There is a trade-off. Montana State University Extension notes that pruning out older wood “can make harvest easier but will reduce production in the following season.” That is why the 25% limit matters. You give up a little fruit now for a healthier, easier-to-pick bush later.

When to prune haskaps

The best time is late winter or early spring, while the plant is dormant. The University of Saskatchewan’s Growing Haskap in Canada guide and the Yukon guide both give that window.

Other sources stretch it a little:

• Ontario: the Ontario ministry says pruning usually happens on dormant plants from January to March. It also says the later you prune, the easier it is to spot and remove winter damage.
• Saskatchewan home gardens: the University of Saskatchewan gardening page says fall or winter works, since the shape of the bare plant is easy to see.
• Nova Scotia: the Nova Scotia haskap best practices manual names late fall or winter.

The one window to skip is late summer and early fall. The Ontario ministry warns that pruning then can push tender new growth that is more likely to suffer winter damage.

Haskaps wake up early. In Saskatchewan they bloom from late April to early May. Wisconsin extension notes that flowers appear about six weeks before the last frost. So if you wait for spring, finish before the buds swell. You can remove dead, broken, or diseased wood at any time of year.

Haskap pruning calendar for cold climates

Season	What to do
Late fall to winter	Main pruning is fine once leaves drop and the plant is dormant
Late winter to early spring	Best time for main pruning, and the easiest time to spot winter damage
Bud swell and bloom	Stop major cuts. Remove only broken or dead wood.
Summer, after harvest	Remove only damaged or diseased branches
Late summer to early fall	Avoid pruning, since it can push tender growth before winter

Tools for pruning haskaps

You only need three tools for a home haskap bush:

• Bypass hand pruners for thin branches and twigs. Bypass blades slide past each other, so they cut cleanly instead of crushing the stem.
• Loppers for thicker branches at the base. The long handles give you leverage and reach into the center of the bush.
• A small folding pruning saw for the oldest, thickest stems on a big or neglected bush.

Staff in a Saskatchewan haskap pruning trial used pruners and loppers and cut as close to the main stem as they could. Keep your blades sharp and clean. Wipe them with rubbing alcohol between plants if any of them show disease. If your pruners are dull or sticky, the Fiskars pruners review covers a budget option.

How to prune haskaps by plant age

How much you cut depends on how old the bush is. Young plants need almost nothing. Mature plants need a small, steady thinning each year.

Plant age	Goal	What to cut
Years 1 to 3	Grow roots and branches	Dead, broken, or diseased wood. Optionally a few weak or crossing shoots.
Years 4 to 6	Shape the bush and start renewal	Low branches that touch the ground, crowded center branches, 1 in 4 to 1 in 6 older stems
Mature (about 2 m tall)	Keep young wood coming	The oldest stems at the base each year, up to 25% of the bush
Old and unproductive	Start over from the roots	The whole bush, cut to about 6 inches (15 cm)

Pruning young haskaps (years 1 to 3)

Leave young haskaps mostly alone. The Ontario ministry says to prune only established, mature plants that are at least 4 years old. Young plants need every leaf to build roots and branches.

In these early years:

• Cut out any dead, broken, or diseased branches.
• Leave healthy shoots in place, even if the bush looks a little messy.
• If two shoots rub, you can remove the weaker one.

Some guides start a bit sooner. The Nova Scotia manual suggests thinning weak shoots and crossing branches from about the second year, and removing low branches by year three. Both approaches are light. The point is to avoid heavy cuts on a young plant.

Haskaps may bear a few berries the year after planting. The University of Saskatchewan says it takes 3 or 4 years before bushes are big enough to give a few kilograms each.

Pruning established haskaps (years 4 to 6)

Around year 4, start a light yearly thinning. This is when the bush begins to crowd itself. Follow the Ontario ministry’s guidelines:

• Remove dead or diseased branches first.
• Cut low branches on the sides that arch down toward the ground.
• Thin branches from the center to let in light.
• Cut at the base of the plant whenever you can.
• Stop at 25% of the canopy.

At this age you may only take out a few branches. That’s fine. The aim is shape and air flow, not size control.

Pruning mature haskaps (renewal pruning)

Mature haskaps get renewal pruning. Each year you remove a few of the oldest stems at ground level. New shoots grow from the base to replace them. Over several years, the whole bush turns over without ever losing its full crop.

The Ontario ministry’s 2019 haskap article, citing University of Saskatchewan breeder Bob Bors, says to start renewal thinning once plants are 2 m (about 6.5 feet) tall. Its 2020 update recommends renewal thinning every year, with a heavier pruning every 3 to 4 years. Even the heavier year stays under the 25% cap.

Aim to remove 1 in 4 to 1 in 6 branches from the base on multi-stem bushes. Some varieties grow from a central trunk instead. On those, thin the upper branches and leave the trunk.

Step-by-step: how to prune a mature haskap

This order follows the Ontario ministry’s practical approach.

1. Look first. Walk around the dormant bush. Count the main stems coming from the ground. Divide by 4 to get the most you can remove this year.
2. Remove dead, broken, and diseased wood. Cut back to healthy wood or to the base. Do this step first, so you can see what living wood is left.
3. Cut the oldest main stems at the base. Choose the thickest, darkest stems with few new shoots. Cut as close to the ground or main stem as you can. Don’t leave stubs.
4. Remove low side branches. Take off branches that arch down and would rest on the ground when loaded with fruit.
5. Open the center. Thin crowded or crossing branches in the middle so light can reach the inside.
6. Step back and stop. Look at the shape. If you are close to 25%, quit for the year. Leave the young, smooth shoots with plump buds. Those are next spring’s berries.
7. Clean up. Rake out the prunings, especially any diseased wood.

If you are new to pruning, the first bush will feel slow. The Ontario ministry notes that pruning gets faster and easier as you work through more plants. For the general cuts behind these steps, see how to prune a plant.

How to rejuvenate an old or overgrown haskap

You have two choices for an old bush that has stopped producing well.

Option 1: Gradual renewal over several years

Use the steps above and remove up to 25% of the oldest stems each year. After about four years, most of the old wood is gone and the bush is full of younger stems. You keep picking berries the whole time. This is the safer choice for a bush that still fruits.

Option 2: Cut it to the ground

The University of Saskatchewan says an old, unproductive haskap “can be chopped down about 15 cm (6″) above the soil surface and allowed to re-grow.” This is a one-time reset, not yearly care. Do it while the plant is dormant. Expect a gap in fruiting while the new shoots grow, since berries form on wood that is at least one year old.

Haskaps can live a long time. The University of Saskatchewan reports ornamental blue honeysuckles on campus over 30 years old and still healthy. A hard reset can give an old plant many more productive years.

What pruning research shows so far

Haskap is a new crop in North America, so pruning research is still young. The Conservation Learning Centre near Prince Albert, Saskatchewan, began a four-year haskap pruning trial in 2023 with the Saskatchewan Ministry of Agriculture. You can read the first-year progress report.

In year one, staff removed about 25% of the lowest branches on the pruned plants, plus any dead wood. Here is what they found:

• Pruned plants averaged 724.7 g (about 1.6 lb) of fruit. Unpruned plants averaged 635.9 g (about 1.4 lb). The report found this difference was not significant.
• Pruning method had no effect on yield, sugar level (Brix), or berry weight in that first year.
• Pruned plants left fewer berries behind after machine harvest: 0.95% compared with 2.27%.
• Some cultivars gave more fruit after pruning, including ‘Boreal Beast’, ‘Boreal Beauty’, ‘Honeybee’, ‘Kawai’, and ‘Tundra’. Others gave less, including ‘Boreal Blizzard’, ‘Happy Giant’, and ‘Indigo Treat’.

The takeaway for home gardeners: light pruning did not hurt the total crop, and it made picking cleaner. Results vary by cultivar. These are first-year results on young plants, so treat them as early.

Common haskap pruning mistakes

Mistake	What happens	Fix
Shearing the bush like a hedge	Removes the one-year-old tips that carry next year’s flowers	Cut whole branches at the base instead
Removing more than 25% in a year	Fewer flowers and berries next season	Spread big jobs over several years
Pruning young plants hard	Slows root and branch growth	Wait until about year 4 for regular pruning
Pruning in late summer or early fall	Pushes tender growth that winter can damage	Prune in late winter or early spring
Pruning after buds swell	Knocks off flower buds	Finish major cuts while the plant is dormant
Leaving stubs	Stubs die back and look untidy	Cut close to the base or main stem
Cutting only young shoots	Leaves old, less productive wood in charge	Remove the oldest stems first
Leaving low, drooping branches	Berries rest on the ground and are hard to pick	Remove branches that arch to the soil

One more problem is not a pruning mistake at all. Montana State University Extension notes that haskaps go into a summer rest in hot weather. Leaves may look tired or drop early in fall. Powdery mildew can also show up on leaves in late summer. Neither is a reason to cut the bush back. The plants perk up as temperatures cool. For leaf mildew, see how to get rid of powdery mildew.

Cold-climate notes for zones 3 to 6

Haskaps are built for cold. University of Saskatchewan cultivars can take -45°C (-49°F), according to the Yukon guide. The University of Saskatchewan says its haskaps need no winter protection. Wisconsin extension lists haskaps for USDA zones 1 to 8.

The flowers are tough too. Open haskap flowers can take -7°C (19°F) without damage, according to the University of Saskatchewan. Montana State University Extension reports flowers hardy to 15°F (-9°C). This early, frost-tolerant bloom is the reason the pruning window closes early in spring.

A few pruning tips for cold regions:

• Prune late in the dormant season. Winter can kill shoot tips if a hard freeze comes before the plant goes dormant in fall. Waiting until late winter lets you see and remove that damage in one pass.
• Check buds for winter injury. The Yukon guide suggests cutting a flower bud in half. Brown or black inside means the bud is dead and won’t make a berry.
• Wait out deep snow. You can’t see the base of the bush under a snowbank. Prune once the snow drops enough to reach the stems, but before bud swell.
• Remove split or broken branches. The Yukon guide notes that freeze and thaw cycles can split trunks. Cut damaged stems back to clean wood. Our guide on protecting shrubs from snow damage has more on this.

Here in the North Okanagan of BC, I garden in about zone 5b/6a. In colder places like the Prairies or the Yukon, spring comes later, so the window shifts later too. Watch the buds, not the calendar.

How haskap pruning compares to blueberries

Haskaps are often compared to blueberries, and the pruning is similar. Both are renewal-pruned in the dormant season. Both get their oldest stems removed at the base. Ontario’s haskap guidance even borrows lessons from blueberry research: younger branches are more productive, and regular moderate pruning gives the best yields.

The main difference is that haskaps need less. Many haskaps grow from fewer stems and stay smaller. Some have a central trunk. If you already know how to prune blueberry bushes, use a lighter hand on your haskaps. Cane berries are a different system. Raspberry canes live two years and then die, as covered in how to prune raspberries.

Haskap pruning FAQ

What month do you prune haskaps?

Prune in late winter or early spring, while the plant is dormant. In Ontario that is usually January to March. In colder areas, prune once you can reach the base of the bush and before the buds swell.

Do haskaps fruit on old or new wood?

Haskaps fruit on one-year-old wood. That is the growth from last summer. Keep as much of it as you can when you prune.

How much can I cut off a haskap?

No more than 25% of the bush in one year. On a multi-stem bush, that is about 1 in every 4 to 6 branches, cut at the base.

Should I prune a newly planted haskap?

Only remove dead, broken, or diseased wood. The Ontario ministry advises waiting until the plant is at least 4 years old before regular pruning.

Can I prune haskaps after harvest in summer?

Only lightly. Remove damaged or diseased branches. Save major cuts for the dormant season, and avoid pruning in late summer or early fall.

Can I cut a haskap to the ground?

Yes, if it is old and unproductive. The University of Saskatchewan says to cut it about 6 inches (15 cm) above the soil and let it regrow. Expect little fruit while it recovers.

How tall should I keep a haskap?

Haskaps grow about 4 to 7 feet (1.2 to 2 m) tall. Don’t top them to control height, since that removes the fruiting tips. Remove the tallest old stems at the base instead.

Is honeyberry pruning the same as haskap pruning?

Yes. Honeyberry, haskap, and blue honeysuckle are all names for Lonicera caerulea. The same pruning rules apply.

Will pruning give me more berries?

Not always right away. A Saskatchewan trial found no significant yield difference after one year of light pruning, though pruned plants were cleaner to harvest. The long-term benefit is a bush that keeps making young, fruitful wood.

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Haskaps ask for little. Leave young plants alone, then take out a few of the oldest stems each late winter. Stay under 25%, keep last summer’s shoots, and the bush will keep fruiting for years. If you are still planning your planting, start with how to grow haskap berries for spacing, pollination partners, and soil.