How to Make Blackberry Jam in Canada (Bernardin Method)

Blackberry jam is the August-September late-summer preserve, especially in BC’s Lower Mainland where wild Himalayan blackberries grow in invasive abundance along almost every road and abandoned lot. A free afternoon of picking yields enough fruit for a year of jam.

This guide covers the Bernardin water-bath method. The processing time is the standard Bernardin time; verify against your edition.

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Pick your blackberries

Wild (BC)

• Himalayan blackberry (Rubus armeniacus) — invasive species across BC’s Lower Mainland; massive crops; free
• Trailing blackberry / native blackberry (Rubus ursinus) — Pacific Northwest native; smaller berries; less common
• Black raspberry (Rubus occidentalis) — across southern Canada in clearings; smaller berries; intense flavour

Cultivated

• Marion blackberry — Pacific Northwest commercial; excellent jam variety
• Triple Crown — thornless; large berries; sweet
• Chester thornless — late-season; reliable; lower pectin
• Black Satin — early-season; thornless
• Doyle’s Thornless — backyard-popular; large berries

Other Canadian regions

• Ontario: small commercial production; farmer’s markets in season
• Maritime provinces: scattered wild and cultivated
• Prairies: too cold for most blackberry varieties; Saskatoon berries are the equivalent

You need about 1 kg of blackberries (5 cups crushed) for a 6-jar batch. Frozen works perfectly (growing blackberries in Canada).

What you need

• Fresh or frozen blackberries — the quantity your pectin box’s blackberry jam recipe gives
• Granulated sugar, bottled lemon juice and pectin — the quantities from that same box recipe; don’t cut the lemon juice, the acidity depends on it
• Path B is Bernardin’s own no-added-pectin recipe and carries its own quantities and yield
• Certo liquid pectin, the amount your box’s recipe specifies OR 1 box Bernardin Original (Path A)
• Optional: ½ tsp butter to reduce foam
• Bernardin 250 mL regular-mouth jars, fresh SNAP lids, bands
• Food mill or fine-mesh sieve (only if making seedless) — which mill to buy, and when a sieve is enough
• Standard canning kit — jar lifter, headspace tool, funnel, water-bath canner, ladle, large heavy pot, potato masher (which canner to buy)
• Frozen plates for cold-plate test (no-pectin path)
• Apron — blackberry juice stains permanently

Method (Path A: With commercial pectin)

Step 1: Prep blackberries

1. Sort blackberries — discard any mushy, mouldy, or unripe (red) berries.
2. Wash gently by dunking in cool water in a colander (don’t rinse under tap — bruises).
3. Drain. Pat very dry with tea towels.
4. Crush in a heavy pot with a potato masher.
5. Measure — should be 5 cups crushed.

Step 2: Seedless option

If making seedless jam, pass crushed blackberries through a food mill with the fine disc, OR press through a fine-mesh sieve with a spatula.

This step costs about 30% of yield but produces dramatically smoother jam — worth it for gift jars.

Step 3: Combine

1. Stir the crushed (or strained) blackberries, the bottled lemon juice and the pectin — quantities from your box recipe — plus optional ½ tsp butter in the pot.
2. Stir constantly over high heat.

Step 4: Boil and add sugar

1. Bring to a full rolling boil — one that can’t be stirred down.
2. Add all the sugar at once — the amount your box recipe gives — stirring vigorously.
3. Return to a full rolling boil and boil hard 1 minute exactly.
4. Remove from heat, skim foam.

For Certo liquid pectin: combine berries + sugar + lemon juice. Bring to rolling boil. Add the amount of Certo your box’s recipe specifies. Return to rolling boil; boil 1 minute. Remove.

Step 5: Jar and process

1. Have your water-bath canner simmering.
2. Have hot jars ready, fresh SNAP lids on the counter.
3. Ladle hot jam into hot jars. Leave 0.5 cm (¼ inch) headspace.
4. Run the headspace tool down each jar.
5. Wipe rims, apply lids fingertip-tight.
6. Process 10 minutes at altitudes up to 305 m (verify with Bernardin edition).
7. Adjust for altitude per our altitude article.
8. Cool 24 hours undisturbed. Check seals.

If a jar doesn’t seal: the 24-hour rule applies.

Bernardin publish two pectin-set berry jams of their own in the Complete Book of Home Preserving (ISBN 978-0-7788-0137-5): a powdered-pectin Berry or Black Currant at p.29 and a liquid-pectin Berry at p.38. Both name blackberries in their fruit line. Each is a complete recipe with its own quantities, and the two differ from each other because the pectin type changes the proportions — read the one that matches the pectin in your hand. We are not restating their quantities here.

Corrected 17 September 2026: Path A on this page used to publish quantities of its own — 1 kg of blackberries, 5 cups of sugar, 2 tbsp of bottled lemon juice and a yield of 6 × 250 mL jars — beside a pectin amount deferred to the box. They were ours. A pectin set is calibrated to the fruit, the sugar and the pectin together, so the box recipe governs all of them, and Path A now defers to it throughout. The flavour variations this page carried have been removed for the same reason. Path B (p.21) is unchanged.

Method (Path B: Bernardin’s traditional no-pectin berry jam)

Bernardin publishes one traditional no-added-pectin recipe covering a whole class of berries — Complete Book of Home Preserving, ISBN 978-0-7788-0137-5, p.21, a variation on their Traditional Apricot Jam on p.20. The class is theirs, and they name its members: blackberries, blueberries, boysenberries, dewberries, gooseberries, loganberries, raspberries, youngberries, or a combination of these berries. Blackberries are in it. There is no separate tested no-pectin blackberries jam — this recipe is what covers them.

• 9 cups (2.25 L) crushed berries
• 6 cups (1.5 L) granulated sugar
• Makes about six 250 mL jars

No lemon juice. p.21 lists fruit and sugar for this variation and nothing else. The 4 tbsp (60 mL) of bottled lemon juice on p.20 belongs to their apricot jam, and we are not moving a figure onto a recipe they did not put it in. Path A above is a different recipe and keeps its own lemon juice.

1. Combine the crushed berries and sugar in a large deep stainless steel saucepan. Bring to a boil over medium heat, stirring constantly to dissolve the sugar.
2. Boil, stirring frequently, until the mixture thickens. Bernardin gives no minute count — the gel test below is what tells you it is done.
3. Take it off the heat and test the gel. Once it has reached the gel stage, skim the foam.
4. Ladle into hot 250 mL jars leaving 0.5 cm (¼ inch) headspace. Release air bubbles, wipe the rims, apply fresh SNAP lids fingertip-tight.
5. Process 10 minutes with the jars completely covered by water, adjusted for your altitude per our altitude article.
6. Turn off the heat, remove the canner lid, wait 5 minutes, then lift the jars out. Cool 24 hours undisturbed and check the seals — if one did not seal, the 24-hour rule applies.

Bernardin’s tip for this section: use about three parts fully ripe fruit to one part slightly under-ripe, because under-ripe fruit carries more pectin. Expect a softer set and a darker colour than Path A.

The gel test

A jam with no added pectin is finished when it passes a gel test, not when a timer goes off. Bernardin publishes three tests on p.19. The one that needs no thermometer is the refrigerator test:

Take the pan off the heat first, so it cannot overcook while you test. Chill two or three small saucers in the freezer. Put a teaspoonful (5 mL) of the jam on a cold saucer, chill it in the freezer for 1 minute, then push the edge with your finger — jam that has reached the gel stage is set, and the surface wrinkles when you push it. If it has not gelled, put the pan back on the heat for a few minutes and test again on a fresh cold saucer. The full walk-through is in why didn’t my jam set.

Bernardin publishes two others on the same page: a sheet test off a cold metal spoon, and a thermometer test. Read them at p.19.

Corrected 17 September 2026: this page’s no-pectin method used to be ours — 5 cups of crushed blackberries, 4.5 cups of sugar and a 20–25 minute boil, with no source behind any of it. It is replaced above by what Bernardin publishes: the traditional berry jam at p.21 of the Complete Book of Home Preserving (ISBN 978-0-7788-0137-5). Their recipe has different quantities and gives no boil time at all; the gel test is what ends the cook. The processing time, 10 minutes for 250 mL jars, and the 0.5 cm headspace are unchanged.

Storage

• Cool, dark, dry place at room temperature
• Best quality 12 months — Bernardin’s guidance is to use home-canned food within one year. That is a quality window, not an expiry: the jar is as safe as the process made it. Colour, flavour and texture fade.
• After opening: refrigerate, use within one week (HealthLink BC)
• Deep purple-black colour holds for years

Corrected 31 Aug 2026: this page previously gave an after-opening window of 3-4 weeks. HealthLink BC File #22 publishes one week for any opened home-canned container — “Once the container has been opened, refrigerate leftovers, and use within one week.” Our longer figure was never attributed to anyone. The shelf life of the sealed jar is unchanged.

Variations

This page used to carry eight — lemon zest, vanilla, ginger, a blackberry-apple blend, a blackberry-pear blend, a chunky preserve, a cassis version and a seedless jelly. They are gone. Each added, swapped or re-proportioned something the tested recipe did not contain, on quantities no source we hold publishes, and the cassis one was labelled refrigerator-only — which admits the jar was never tested rather than making it safe. Follow the recipe on your pectin box, or one of the Complete Book’s berry jams at p.29 and p.38.

How to use blackberry jam

• On toast or scones — daily breakfast staple
• PB&J — peanut butter and blackberry is excellent
• Filling for thumbprint cookies, linzer cookies
• Stirred into yogurt or oatmeal
• Cheese pairing — sharp cheddar, aged brie, blue cheese, goat cheese
• As a topping for cheesecake or pavlova
• Glaze for chicken or duck — brush in last 15 minutes of roasting
• In a Bakewell tart — almond + jam combination
• In crepe filling with cream
• As a cocktail mixer — muddle into gin or whisky
• Holiday gift — deep purple jam is striking

Common problems

• Tiny seeds annoy. Use the seedless food-mill method next batch.
• Jam too soft. Either commercial pectin skipped or undercooked. See why didn’t my jam set for salvage paths.
• Jam too firm/gummy. Over-cooked. Warm with 1 tsp water to loosen.
• Foam stayed in. Skim better; use ½ tsp butter trick.
• Jam tastes bland. The lemon juice was skipped or cut. There is no tested way to correct the acid of a finished jar, so treat the batch as a fridge preserve and follow the box recipe next time.
• Berries floated to top. Stir between jars or let jam cool 5 minutes before ladling.
• Colour faded after months. Light exposure. Store dark.
• Jar didn’t seal. The 24-hour rule.
• Hands stained purple after picking. Welcome to wild blackberry picking. Lemon juice removes most stains; persistent stains fade in days.

Yield expectations

A typical Canadian household makes 6-12 × 250 mL jars per season.

Why home blackberry jam is worth making

• Free if foraged — wild Himalayan blackberries in BC are essentially infinite
• Better than commercial — supermarket blackberry jam is over-sweetened
• Deep colour and intense flavour — wild blackberries especially
• Gift-friendly — deep purple jars are striking
• Late-season alternative — when other berries are done, blackberries are at peak
• Heritage Canadian — BC coastal foraging tradition

Foraging tips for BC wild Himalayan blackberries

If you’re picking wild:

1. Late August to mid-September is peak in BC’s Lower Mainland.
2. Wear long sleeves and pants — thorns are aggressive.
3. Bring multiple containers — berries crush each other; smaller containers protect bottom layers.
4. Pick the dark, fully-black, easily-detaches berries — slightly-red berries are unripe.
5. Avoid the first 10 metres from any road — vehicle exhaust contamination.
6. Avoid recently-sprayed areas — municipal weed-spray programs target invasive blackberry.
7. 2 hours of picking typically yields 5-10 kg of berries.
8. Process within 24 hours — wild blackberries soften fast.

A typical BC foraging session yields enough for 2-3 jam batches plus berries for fresh eating and freezing.

Next steps

• How to make raspberry jam in Canada — companion cane-fruit jam
• How to make blueberry jam in Canada — same August window
• How to make strawberry jam in Canada — gateway recipe
• How to freeze berries in Canada — store blackberries for off-season jam
• Why didn’t my jam set — troubleshooting
• Canning altitude adjustments — required reading
• Water-bath canning pillar — broader method