Blackberry Moonrocks by Blimburn Seeds is a compact, extremely potent indica-dominant strain famous for its very high THC and sweet berry flavor. A cross of Blue Moonrock x a male Blackberry Kush, it is a feminized photoperiod plant reaching a huge 26-33% THC, with berry and blueberry flavors and a focused, happy, deeply relaxing effect. It stays small, yields well, and finishes in 8-10 weeks, making it a top-shelf choice for growers who want maximum potency.
This is a feminized photoperiod strain, not an autoflower, so it flowers when you shorten the light cycle and gives you full control over veg length, training, and cloning. If you specifically want the autoflower, that is a separate variety. The figures below are the breeder’s values; check your own pack for the exact numbers.
Recommended Strains
Blackberry Moonrocks
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THC | 26% - 33% (High) |
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Lineage | Blue Moonrock x male Blackberry Kush |
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Type | Feminized |
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Height | 3.94 ft | 1.2 m |
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Yield | High |
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Yield Indoor | 1.8 oz/ftĀ² | 550 g/mĀ² |
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Yield Outdoor | 12.35 - 22.93 oz/plant | 350 - 650 g/plant |
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Flowering Time | 8 - 10 weeks |
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Phenotype | 80% Indica / 20% Sativa |
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Medical | Arthritis, Depression, Fatigue, Migraines |
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Effects | Focused, Happy, Relaxed |
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Flavors | Berry, Blueberry |
Blackberry Moonrocks Auto
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THC | 26% - 33% (High) |
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Lineage | Blue Moonrock x male Blackberry Kush x Ruderalis |
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Type | Autoflowering |
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Height | 3.94 ft | 1.2 m |
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Yield | High |
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Yield Indoor | 1.8 oz/ftĀ² | 550 g/mĀ² |
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Yield Outdoor | 4.23 - 7.05 oz/plant | 120 - 200 g/plant |
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Life Cycle | 8 - 10 weeks |
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Phenotype | 80% Indica / 20% Sativa |
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Medical | Arthritis, Depression, Fatigue |
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Effects | Focused, Happy, Relaxed |
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Flavors | Berry, Blueberry |
Blackberry Moonrocks Grow Info
| Trait | Blackberry Moonrocks (Blimburn) |
| Genetics | Blue Moonrock x male Blackberry Kush |
| Seed type | Feminized photoperiod |
| Genetic profile | 80% indica / 20% sativa |
| THC | 26-33% (very high) |
| Flowering time | 8-10 weeks |
| Height | Compact, around 1.2 m |
| Indoor yield | High, around 550 g/mĀ² |
| Outdoor yield | Around 350-650 g per plant |
| Effects | Focused, happy, relaxed |
| Flavor | Berry, blueberry |
These are Blimburn’s published figures for Blackberry Moonrocks at Growlantis. When you need an exact THC percentage, height, or yield, check the specification on your own Blackberry Moonrocks seed pack.
What Makes Blackberry Moonrocks Worth Growing
Blackberry Moonrocks is about serious potency and flavor in a small package. Its very high 26-33% THC puts it among the strongest strains you can grow, and its Blue Moonrock and Blackberry Kush heritage delivers a sweet, rich berry and blueberry flavor over a focused, happy, deeply relaxing effect. For experienced users chasing maximum strength, it delivers.
It is also compact and productive. It stays a tidy 1.2 m yet yields a high 550 g/mĀ² indoors of dense, extremely resinous buds. That mix of elite potency, sweet berry flavor, small size, and strong yield makes it a standout photoperiod, and the heavy resin makes it excellent for extracts too.
Is Blackberry Moonrocks Indica or Sativa?
Blackberry Moonrocks is strongly indica dominant, listed at 80% indica and 20% sativa, from its Blue Moonrock and Blackberry Kush parents.
That indica lean shows in both the plant and the effect. It grows short, bushy, and compact, ideal for small spaces, and the high is deeply relaxing with a focused, happy edge, best suited to evening use. Despite its heavy indica structure, the listed focused note keeps it from being purely sedative, though its sheer potency means a little goes a long way.
Flowering Time vs Full Grow Time
Because Blackberry Moonrocks is a photoperiod strain, these two numbers are separate, and mixing them up is the most common planning mistake.
- Flowering time: 8-10 weeks. This is the bloom stage, which starts only when you switch the lights to 12/12 indoors (or when days shorten outdoors).Ā
- Full grow time (seed to harvest): flowering plus however long you veg. Indoors, a typical grow runs around 4 to 5 months from seed, depending on veg length.Ā
The practical point: you control the total time by choosing your veg length. A longer veg means a bigger plant and harvest; a shorter veg gets you there faster. Outdoors, expect to finish around early to mid October.
Does Blackberry Moonrocks Need a 12/12 Light Cycle?
Yes. Blackberry Moonrocks is a photoperiod strain, so indoors it needs a 12/12 light cycle (12 hours on, 12 hours off) to start and maintain flowering.
Keep it on a long veg schedule, usually 18/6, for as long as you want it to grow, then flip to 12/12 when it has the size and shape you want. Account for the stretch so it stays under your height limit. Outdoors, shortening late-summer days trigger flowering naturally. If you want a plant that flowers on age instead, that is the separate autoflower version.
Blackberry Moonrocks Grow Timeline, Week by Week
Treat this as a development pattern, not a fixed schedule, since veg length is up to you.
- Weeks 1-2: germination and seedling. The taproot and first true leaves establish. Keep humidity up and feeding minimal.Ā
- Weeks 3-5: vegetative growth (your choice). The plant builds its compact frame under 18/6. This is when you top and train.Ā
- Week 0 of flower: the flip. Switch to 12/12. Expect a moderate stretch.Ā
- Weeks 1-3 of flower: stretch and bud set. Vertical growth finishes and flower sites form.Ā
- Weeks 4-8 of flower: bud development. Extremely resinous buds fill out and the sweet berry aroma builds.Ā
- Weeks 8-10 of flower: ripening and harvest. Judge by trichomes, not the calendar.Ā
Choosing Your Setup: Space, Light and Pots
Blackberry Moonrocks stays compact at around 1.2 m with a moderate stretch, so it fits easily into small tents. Flip to 12/12 while it is comfortably under your height limit, and use low stress training or a SCROG net to keep the canopy even and lift the yield.
Give it strong light to back the very high THC and heavy resin. A full-spectrum LED at 30-40 watts per square foot over the flowering canopy keeps the colas dense and frosty. Add a good inline exhaust fan and a carbon filter, since the sweet berry aroma is noticeable in flower.
For pots, 3-5 gallon containers suit most indoor grows, scaled to veg time and plant size. Fabric pots improve root airflow and help prevent overwatering.
Germinating and Raising Seedlings
The paper towel method is the simple, reliable start. Soak the seeds for 12-24 hours, then place them between damp paper towels on a covered plate, kept dark and warm at 70-85Ā°F (21-29Ā°C). A taproot usually appears within two to three days.
When the taproot reaches about 1-2 cm, plant it root-down a knuckle deep in a light mix and keep the surface moist until the seedling emerges. Hold off on nutrients at this stage. New to growing? Our beginner growing guides cover germination step by step.
The Vegetative Stage, Topping and Training
Veg is where you shape a photoperiod plant, and Blackberry Moonrocks’ compact, resinous frame responds well to training. Keep it under 18/6 with a nitrogen-rich feed and build a strong, even frame before you flower.
Topping the main stem early encourages multiple colas and a wider, flatter canopy, which spreads the yield, helpful for making the most of its compact size. Combine it with low stress training or a SCROG net to expose more bud sites to light. This is also the stage to take clones: cut from a healthy plant in veg to preserve a phenotype you like, since photoperiods clone reliably. Keeping a potent mother is a good way to run repeatable harvests. Finish training before the flip.
Feeding and Watering Blackberry Moonrocks
Feed to the stage. Use a nitrogen-forward base through veg, then move to a bloom formula higher in phosphorus and potassium once you flip to 12/12 and buds form. A dense, resinous, high-THC plant handles a solid feed, but start moderate and increase based on how the plant responds rather than overfeeding early.
Water by root-zone moisture, not a timetable. Let the top inch or two of medium dry between waterings, then water thoroughly until a little drains. Fabric pots and this water-to-weight habit keep the roots healthy and prevent overwatering.
Flowering and Knowing When to Harvest
Once you flip to 12/12, expect a moderate stretch, then extremely resinous buds fill out over the 8-10 week bloom. The sweet berry and blueberry aroma develops, so keep air moving and run a carbon filter indoors.
Let ripeness, not the calendar, decide the harvest. Check the trichomes under a loupe and cut when most are cloudy with a few turning amber for the fullest effect. After harvest, hang the branches in the dark at about 60Ā°F (15-16Ā°C) and 55-60% humidity for 7-14 days, then cure in sealed jars, burping daily for the first couple of weeks to protect the sweet berry flavor.
Growing Indoors vs Outdoors
Indoors, Blackberry Moonrocks rewards control. Hold 18/6 for veg, flip to 12/12, train the canopy even, and the high 550 g/mĀ² yield of frosty, potent flower is very reachable under strong light.
Outdoors, it is a solid producer in a warm, sunny climate, returning around 350-650 g per plant depending on conditions and usually finishing around early to mid October. Its compact size makes it easy to place and discreet. Give it full sun, rich well-draining soil, and airflow around the dense buds.
How Tall and How Much? Height and Yield
Height is easy to plan for. Blackberry Moonrocks stays compact at around 1.2 m with a moderate stretch, so it is easy to keep within any space with light training.
On yield it is a strong producer, listed as high at around 550 g/mĀ² indoors and 350-650 g per plant outdoors, impressive for such a small, extremely potent plant. Strong light, a topped or SCROG canopy, and a healthy root zone are what turn that potential into real weight of frosty, resinous flower, which is also excellent for extraction.
Best US Climates for Blackberry Moonrocks
Blackberry Moonrocks does well in a warm, sunny climate, so growers in California, the Southwest, and warmer Western and Southern states can comfortably take it to an early-to-mid October finish outdoors. Its 8-10 week flower also makes it workable in slightly cooler, shorter-season states.
Its compact size makes it an excellent indoor choice anywhere, including small or discreet spaces. In the humid Southeast, keep airflow strong around the dense, resinous buds to prevent rot. For more options, browse our full how-to-grow guide library.
Common Problems When Growing Blackberry Moonrocks
A few predictable issues are easy to head off.
Bud rot in dense, resinous buds
The extremely resinous, dense buds can trap moisture. Keep humidity moderate in late flower and air moving through the canopy, especially outdoors.
Overfeeding a potent plant
Even a high-THC strain does not need to be pushed hard. Start moderate and increase based on the plant’s response, watching the leaf tips for nutrient burn.
Underusing a compact plant
Its small size is an asset. Top and train to a wide canopy so you capture the full yield rather than one dense central cola.
Harvesting by the calendar
The 8-10 week window is a guide, not a cutting date. Read the trichomes and pistils before you cut, since phenotype and environment shift the timing.
Making the Most of Your Harvest
Blackberry Moonrocks’ heavy resin makes it great for extracts, so do not waste the trim. The frosty sugar leaves make excellent bubble hash, dry sift, or rosin that keeps the sweet berry character. The stems, roots, and fan leaves compost well and feed your next grow.
Is Blackberry Moonrocks Right for You?
If you want one of the most potent strains available, on a compact, productive plant with a sweet berry flavor, yes. Its very high THC, heavy resin, and small size make it a top-shelf photoperiod for experienced growers. If you want a mild strain, a pure daytime sativa, or a plant that flowers on age, look at a lighter strain or the autoflower version instead. Browse our full how-to-grow guide library for more.
Frequently Asked Questions
Is Blackberry Moonrocks indica or sativa?
Blackberry Moonrocks is strongly indica dominant, listed at 80% indica and 20% sativa, from its Blue Moonrock and Blackberry Kush parents. It grows short, bushy, and compact, ideal for small spaces, and the high is deeply relaxing with a focused, happy edge, best for evening use. Its sheer potency means a little goes a long way.
How long does Blackberry Moonrocks take to flower?
Blackberry Moonrocks flowers in 8 to 10 weeks once you switch to 12/12. Total seed-to-harvest time depends on your veg length, usually around 4 to 5 months indoors. Outdoors it finishes around early to mid October. Judge the finish by trichome maturity rather than the calendar, since phenotype and conditions shift the exact timing.
Does Blackberry Moonrocks need a 12/12 light cycle?
Yes. This photoperiod version needs a 12/12 light cycle indoors to start and maintain flowering. Keep it on 18/6 during veg, then flip to 12/12 when it has the right size. Outdoors, shortening late-summer days trigger flowering. If you want a plant that flowers on age instead, that is the separate autoflower version.
How much does Blackberry Moonrocks yield?
Blackberry Moonrocks is a high yielder, producing around 550 g/m2 indoors and 350 to 650 g per plant outdoors depending on conditions, strong for such a small plant. Strong light, a topped or SCROG canopy, and a healthy root zone are what turn that potential into real weight. Its heavy resin also makes the trim valuable for extraction.
How strong is Blackberry Moonrocks?
Blackberry Moonrocks is extremely potent, listed at 26 to 33% THC and rated very high, among the strongest strains you can grow. The effect is deeply relaxing with a focused, happy edge, best for evening use and for experienced users. Its sweet berry flavor and heavy resin make it a genuinely top-shelf, high-potency indica.
Can you clone Blackberry Moonrocks?
Yes. As a photoperiod strain, Blackberry Moonrocks clones reliably. Take a cutting from a healthy plant during veg, root it, and keep it under 18/6 light. Cloning lets you preserve a standout, high-potency phenotype and run repeatable harvests of the same strength and flavor without buying new seeds each time, which the autoflower version cannot offer.
What does Blackberry Moonrocks taste like?
Blackberry Moonrocks has a sweet, rich flavor of berry and blueberry from its Blue Moonrock and Blackberry Kush heritage. To protect those terpenes, run a carbon filter in flower, dry slowly at around 60Ā°F with moderate humidity, and cure in sealed jars, burping daily for the first two weeks. A careful cure keeps the sweet berry notes full.
