How to Grow Blackberry Autoflower
Blackberry Autoflower is a 70% indica autoflowering strain that delivers sweet berry flavour, a kushy backbone and eye-catching purple buds in a short, quick cycle. The Blackberry Auto runs from seed to harvest in 8–10 weeks whatever the season, which makes it a compact, low-fuss grow.
The strain crosses Cream Caramel Auto with Purple Kush, so it carries a clear kush influence alongside its fruit. From Cream Caramel it inherits the sweet, caramel-berry side and the autoflowering genetics; from Purple Kush it borrows the dense indica structure, the kush flavour and the purple colour that comes out as nights cool. That lineage is why many growers search for it as blackberry kush autoflower.
Recommended Strains
BlackBerry Auto
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THC | 17% - 19% (Medium) |
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Type | Autoflowering |
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Yield | Medium |
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Phenotype | 70% Indica / 30% Sativa |
Blackberry Moonrocks
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THC | 26% - 33% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 80% Indica / 20% Sativa |
Because it flowers on its own and forgives beginner mistakes, it sits among our beginner-friendly options. You can see the full genetics and buy Blackberry Auto seeds on the strain page, or browse more cuts in the Kush strains collection.
Strain Profile at a Glance
| THC | 17–19% (Medium) |
|---|---|
| Lineage | Cream Caramel Auto x Purple Kush |
| Type | Autoflowering |
| Genetics | 70% Indica / 30% Sativa |
| Climate | Temperate |
| Life cycle | 8–10 weeks (seed to harvest) |
| Harvest | All season |
| Height | 3.28 ft / 1 m |
| Yield | Medium |
| Yield indoor | 1.47 oz/ft² (450 g/m²) |
| Yield outdoor | 2.82–4.23 oz/plant (80–120 g/plant) |
| Grow difficulty | Beginner-friendly |
| Flavors | Berry, Kush |
| Effects | Happy, Relaxed, Talkative |
Promos & Deals
Climate and Where to Grow It
Blackberry Autoflower suits a temperate climate with warm, dry days and mild nights. Its dense, indica-style buds hold moisture, so keep airflow strong and humidity moderate through flowering to protect them, especially as those purple colas thicken up.
As an autoflower it does not wait for the season to bloom, so you can start it at almost any time of year and fit several runs into a long season. At around 1 m it stays genuinely small, which makes it easy to tuck into a tent corner, a balcony or a quiet spot outdoors.
If you want the purple colour to show, a cooler night temperature in the last couple of weeks of flowering helps bring it out. Keep indoor daytime temperatures around 68–80°F (20–27°C) and trim the humidity as the buds swell.
Autoflower Growing Basics
With any autoflower, the key rule is that you do not switch the light schedule to trigger flowering. Blackberry begins to flower by itself at around 3–4 weeks of age, so run a long day of 18–20 hours of light from seedling right through to harvest.
Start the seed directly in its final pot. Autos run on a fixed internal clock and dislike transplanting, so moving them mid-cycle costs growth you cannot recover in a short run. Germinate straight into the container you will finish in and handle the roots as little as possible.
Keep training gentle. The vegetative window is short, so skip heavy topping and use low-stress training instead, tucking and tying branches to even out this compact plant’s canopy. On something this size, that light touch is usually enough.
Feeding Schedule (EC Guide)
Autoflowers are light feeders, so start low and build up only as the plant asks. The EC values below track the life-cycle stages rather than a separate veg-and-bloom switch.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4–0.6 | Very light feed, focus on healthy root growth |
| Vegetative growth | 0.8–1.2 | Weeks 2–4, raise nitrogen gently |
| Early flower | 1.2–1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4–1.6 | Peak bloom feed while buds swell |
| Flush | 0.0–0.4 | Plain water for the final 1–2 weeks |
Life Cycle and Harvest
The full life cycle runs 8–10 weeks from seed to harvest. As an autoflower you harvest when the plant is ready rather than on a fixed date, so let the trichomes be your guide.
Expect vegetative growth in weeks 1–3, the automatic switch to flower around weeks 3–4, and bud development and resin through to week 8–10. The 70% indica lean gives it chunky, compact flowers that often finish with deep purple tones. Harvest when most trichomes are cloudy with a few amber for a relaxed, rounded effect.
Give the plant a 1–2 week plain-water flush before cutting. Because it is an all-season auto, you can time your start date so the finish lands whenever suits you.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15–18°C) and 55–60% humidity for 7–14 days, until the thin stems snap rather than bend. A slow dry preserves both the berry aroma and the purple colour.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure deepens the sweet berry-kush flavour and smooths the smoke, so it is worth the patience.
What to Do With Your Trim
Don’t bin the sugar leaves you remove during manicuring. Blackberry’s resinous trim is ideal for dry sift, rosin or infused edibles, so you get extra value from every plant instead of throwing the frosty offcuts away.
Flavor and Terpenes
Blackberry tastes of sweet, ripe berry over an earthy, kushy base, exactly what you would expect from a Cream Caramel and Purple Kush cross. The berry is a flavour impression from the lineage rather than a dedicated fruit terpene, while the kush side comes through as earthy spice.
Six terpenes carry most of the aroma: myrcene (earthy, fruity-sweet base), caryophyllene (peppery, spicy kush edge), humulene (woody, hoppy depth), alpha-pinene (resinous pine), citral (a bright lemon lift) and eugenol (clove-like spice). Behind them sit cedrene, borneol, cadinene, camphene, farnesene and fenchol, a broad cast that gives the kush base its complexity.
Effects and Best Use
Blackberry Autoflower is happy, relaxed and talkative, a mellow indica-leaning profile that lifts the mood and eases the body without knocking you out.
That sociable, easygoing character makes it a good evening and downtime strain that still leaves room for conversation. Combined with its small size, quick life cycle and good looks, it is an approachable pick for growers who want a sweet, colourful auto that is simple to run.
Common Problems and Pro Tips
Blackberry Autoflower is a small, easy grow, but it is a compact purple indica auto, so a little planning brings out its colour and aroma.
- Train gently, not hard: as an autoflower it will not recover from heavy topping, so use low-stress bending while young and start it in its final pot.
- Use cool nights for colour: its purple tones deepen when late-flower nights turn cooler, so a slight night-time temperature drop helps bring out that colour.
- Keep air moving: as a 70% indica the kushy buds are fairly dense, so keep humidity down and air moving through the canopy to avoid mold.
Expert tip: the sweet berry and kush aroma is the main draw. Dry slowly in a cool, dark space and cure in jars so that ripe-berry character holds rather than fading.
Frequently Asked Questions
Is Blackberry Autoflower indica or sativa?
It is indica-dominant, at roughly 70% indica and 30% sativa, so the effect is relaxed and body-forward while staying sociable. That indica lean gives fairly dense, kushy buds on a compact plant, so keep humidity down and air moving through the canopy to protect them as they fill out.
How long is the Blackberry Autoflower life cycle?
About 8 to 10 weeks from seed to harvest. As an autoflower it flowers on age rather than on a light change, so the clock does not stop for mistakes, and it can be run all season. Plan your feed and training around that short, fixed window to get the most from it.
Do I need to change the light cycle?
No. Keep it on a long day of 18 to 20 hours of light from seedling to harvest. It starts flowering on its own at around three to four weeks, so there is no 12/12 flip to time. A steady, generous light schedule gives this compact plant the energy to fill out.
Is Blackberry good for beginners?
Yes. It is a small, easy, forgiving autoflower at around 1 m, listed among our beginner-friendly strains. Start it in its final pot to avoid transplant shock, keep any training gentle, and it mostly looks after itself. Cooler late-flower nights also help bring out its signature purple colour.
What does Blackberry Autoflower taste like?
Expect sweet, ripe berry over an earthy kush base, with a bright lemon lift and a peppery spice. That profile comes from its citral, caryophyllene and eugenol. Dry slowly in a cool, dark space and cure in jars so the ripe-berry character holds rather than fading to plain green.
How much does Blackberry Autoflower yield?
It is a medium producer: around 1.47 oz/ft² (450 g/m²) indoors and 2.82 to 4.23 oz (80 to 120 g) from a potted plant outdoors, which is typical for a compact auto. Good light and an open canopy help this small plant make the most of its short cycle.
