CR+ is a Blimburn Seeds hybrid bred for serious yields. From Critical Mass x AK47, two of the most productive strains in cannabis, it is a heavy-yielding indica-leaning plant at 20-22% THC with a bright citrus flavor. It grows tall and packs on dense buds, with a happy, relaxing effect, which makes it a rewarding choice for growers who want a big harvest.
This is a photoperiod feminized strain, so it flowers when you shorten the light cycle. The figures below are Blimburn breeder values; check your own pack for the exact numbers.
Recommended Strains
Cr+
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THC | 20% - 22% (Medium) |
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Lineage | Critical Mass x AK47 |
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Type | Feminized |
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Height | 9.84 ft | 3 m |
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Yield | High |
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Yield Indoor | 2.13 - 2.46 oz/ft² | 650 - 750 g/m² |
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Yield Outdoor | 19.4 - 24.69 oz/plant | 550 - 700 g/plant |
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Flowering Time | 8 - 10 weeks |
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Phenotype | 60% Indica / 40% Sativa |
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Medical | Fatigue, Muscle Spasms, Stress |
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Effects | Happy, Relaxed, Talkative |
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Flavors | Citrus, Sweet |
Power Plant
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THC | 15% - 20% (Medium) |
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Lineage | Original South African Power Plant |
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Type | Feminized |
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Height | 4.92 ft | 1.5 m |
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Yield | High |
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Yield Indoor | 1.64 - 1.97 oz/ft² | 500 - 600 g/m² |
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Yield Outdoor | 28.22 oz/plant | 800 g/plant |
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Flowering Time | 8 - 10 weeks |
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Phenotype | 40% Indica / 60% Sativa |
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Effects | Talkative, Energetic, Focused |
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Flavors | Pepper, Woody, Earthy |
CR+ Grow Info
| Trait | CR+ (Blimburn Seeds) |
| Genetics | Critical Mass x AK47 |
| Seed type | Feminized (photoperiod) |
| Genetic profile | 60% indica / 40% sativa |
| THC | 20-22% (medium) |
| Flowering time | 8-10 weeks |
| Height | Up to 3 m outdoors, a tall plant |
| Indoor yield | Very high, 650-750 g/m² |
| Outdoor yield | 550-700 g per plant |
| Effects | Happy, relaxed, talkative |
| Flavor | Citrus, sweet |
These are Blimburn’s published figures for the CR+ line at Growlantis. When you need an exact THC percentage, height, or yield, check the specification on your own CR+ seed pack.
What Makes CR+ Worth Growing
Yield is the whole point. With Critical Mass and AK47 in its genes, CR+ is one of the heaviest producers you can grow, reaching an exceptional 650-750 g/m² indoors and 550-700 g per plant outdoors. If a big harvest is the goal, few strains deliver more.
It is not just quantity. At a solid 20-22% THC with a bright citrus-sweet flavor, the quality holds up, and the effect is happy, relaxed, and talkative, balanced rather than one-sided. The main thing to plan for is size, since it grows tall and the buds get heavy, but it stays manageable and beginner-friendly with a bit of training and support.
Is CR+ Indica or Sativa?
CR+ is indica leaning, listed at 60% indica and 40% sativa. The indica side leads slightly.
In the plant, that shows as a tall but sturdy, very productive structure with dense, heavy buds from the Critical Mass side. In the high, the effect is happy and relaxing with a talkative, sociable edge from the AK47 influence, so it works through the day as well as the evening. It is a well-rounded, productive all-rounder.
Flowering Time and Total Grow Time
Because CR+ is a photoperiod strain, two timing numbers matter, and they are not the same.
- Flowering time: 8-10 weeks. This is the bloom stage, and it starts only when you switch the lights to 12/12 indoors, or the outdoor days shorten in late summer.
- Total grow time (seed to harvest): flowering plus your veg period. Veg length is yours to set, so a typical indoor run from seed lands around 12-16 weeks depending on how long you veg.
The practical point is that the 8-10 week figure is the flowering window, not the whole grow. On a tall plant, veg length is the main lever for final size, so keep it short indoors.
Does CR+ Need a 12/12 Light Cycle?
Yes. CR+ is a photoperiod strain, so indoors it needs a 12/12 light cycle to start flowering. You keep it under a longer schedule, usually 18/6, through veg, then switch to 12 hours on and 12 off to trigger bloom.
Outdoors the season does this for you, with flowering beginning as the days shorten in late summer. This is the key difference from an autoflower, which blooms on age no matter the light schedule.
CR+ Grow Timeline, Week by Week
Veg length is up to you, so the flowering weeks are the fixed part. Adjust the start to suit your space.
- Weeks 1-2: germination and seedling. The taproot and first leaves establish. Keep water light and conditions stable.
- Weeks 3-5: vegetative growth. The plant builds a tall, productive frame. Top it and train early, and keep veg short indoors to control size.
- Flip to 12/12: switch the light cycle at about two thirds of your target height, to leave room for the stretch.
- Flower weeks 1-3: the stretch and first pistils. Set supports for the heavy buds to come.
- Flower weeks 4-8: dense, heavy buds stack and the citrus aroma builds.
- Flower weeks 8-10: ripening and harvest. Judge by the trichomes, not the day count.
Choosing Your Setup: Space, Light and Pots
Plan for height and weight. CR+ can reach 3 m outdoors, so indoors you want vertical room, a short veg, and a training plan, and the heavy buds will need support later. Outdoors its size is an asset for yield.
Light should be strong to feed those big flowers. A full-spectrum LED at 30-40 watts per square foot over a trained canopy is what gets you toward the 650-750 g/m² ceiling. Pair it with good exhaust and airflow through flowering.
For containers, use 5-7 gallon pots indoors, or larger fabric pots and open ground outdoors where it really loads up. As a photoperiod, it transplants fine, so you can pot up as it grows.
Germinating and Raising Seedlings
The paper towel method is the easy, reliable start. Soak the seeds for 12-24 hours, then set them between damp paper towels on a covered plate, kept dark and warm at 70-85°F (21-29°C). A taproot usually shows in two to three days.
When the root reaches about 1-2 cm, plant it root-down a knuckle deep in a light, airy mix and keep the surface moist until it breaks ground. New to germination? Our beginner growing guides walk through it step by step.
The Vegetative Stage and Training
Because CR+ is a photoperiod plant, you can veg as long as you like and use the full training toolkit, which autoflowers cannot handle.
With a tall, heavy yielder, training is how you manage and maximize it. Top it early and use LST or a SCROG net to control the height and spread the branches into a flat canopy so light reaches more bud sites. Keep nitrogen available through veg, flip before it reaches your ceiling, and plan supports for flower, because the Critical Mass buds get heavy enough to bend branches.
Feeding and Watering CR+
Feed to match the yield. This is a hungry, extremely productive hybrid, so it takes a full bloom schedule, but build it up gradually and read the leaves rather than chasing the bottle. Use a nitrogen-forward base through veg, then shift to a bloom formula higher in phosphorus and potassium once you flip to 12/12.
Water by root-zone moisture. A big, productive plant drinks heavily in late veg and flower, so expect demand to climb, and let the top layer dry between waterings to keep oxygen at the roots.
Flowering and Knowing When to Harvest
After the flip, the plant stretches for two to three weeks, then settles into heavy bud production. The citrus aroma builds through the middle weeks, so run a carbon filter indoors, support the colas, and keep air moving around the dense canopy.
As the 8-10 week window closes, let the trichomes decide. Harvest when most are cloudy with a few amber. After the cut, hang the branches in the dark at about 60°F (15-16°C) and 55-60% humidity for 7-14 days, then cure in jars, burping daily for the first weeks.
Growing Indoors vs Outdoors
Indoors, the key tasks are managing the height and supporting the buds. Keep veg short, train into a flat canopy under strong light, and the exceptional 650-750 g/m² indoor yield is reachable.
Outdoors, CR+ really loads up, reaching 3 m and returning 550-700 g per plant in a sunny spot with good soil. Plant after the last frost, give it full sun and room, and stake the heavy branches well before harvest.
How Tall and How Much? Height and Yield
Height is the planning point. CR+ can reach 3 m outdoors, so give it room or keep veg short and train indoors.
Yield is the headline: an exceptional 650-750 g/m² indoors and 550-700 g per plant outdoors. Those are top-end breeder figures and among the highest around, so strong light, canopy management, good bud support, and healthy roots are what let you hit them.
Best US Climates for CR+
CR+ does best in warm, sunny climates with good soil and a long season for its huge yields. Growers in California and the West get easy outdoor finishes and massive plants.
Its 8-10 week flowering also helps it finish in temperate and northern states before the fall weather turns. In the humid Southeast, support the heavy buds and keep airflow strong to protect the dense colas. For another Critical Mass cross, see our Critical Daddy Purple grow guide.
Common Problems When Growing CR+
A few predictable issues are easy to avoid on a tall, heavy yielder.
Not supporting the heavy buds
The Critical Mass genetics make the colas dense and heavy enough to snap branches. Add stakes or a trellis before flower gets heavy, especially outdoors.
Running out of vertical space
At up to 3 m with a flowering stretch, CR+ overgrows a short tent fast. Keep veg short, flip early, and top plus SCROG to hold a flat canopy indoors.
Underfeeding a heavy yielder
This is a very hungry hybrid. Feeding it like a light plant leaves a lot of yield on the table, so build the bloom feed up gradually to match its vigor while watching for burn.
Humidity in dense buds
Big, dense flowers trap moisture and can rot. Keep late-flower humidity down and air moving through the canopy to protect the harvest.
Making the Most of Your Harvest
Do not waste the trim. A huge yielder leaves plenty of resinous sugar leaf for bubble hash, dry sift, or infused oil. The stems, roots, and fan leaves compost well and feed your next grow.
Is CR+ Right for You?
If maximum yield is your goal, yes. Its Critical Mass and AK47 heritage make it one of the most productive strains you can grow, with solid potency and a bright citrus flavor. Just plan for its height and support the heavy buds. For another big-yielding Critical Mass cross, see our Critical Daddy Purple grow guide.
Frequently Asked Questions
Is CR+ indica or sativa?
CR+ is indica leaning, listed at 60% indica and 40% sativa, from Critical Mass and AK47. It grows as a tall but productive plant with dense, heavy buds, and the effect is happy and relaxing with a talkative, sociable edge. That balance makes it work through the day as well as the evening.
Does CR+ need a 12/12 light cycle?
Yes. CR+ is a photoperiod strain, so indoors it needs the light switched to 12/12 to start flowering. You veg it under a longer schedule like 18/6, then flip to 12 hours on and 12 off. Outdoors it flowers naturally as late-summer days shorten.
How long does CR+ take to flower?
CR+ flowers in about 8 to 10 weeks once you switch to 12/12. That is the bloom stage only. Total time from seed also includes your veg period, which on a tall plant you often keep short to control size, so plan the overall grow around flowering plus however long you veg.
How much does CR+ yield?
CR+ is an exceptional yielder thanks to its Critical Mass and AK47 side: up to 650 to 750 g/m2 indoors and 550 to 700 g per plant outdoors. Those are among the highest breeder figures around, so strong light, canopy management, bud support, and healthy roots are what let you hit them.
How tall does CR+ grow?
CR+ is tall, reaching up to about 3 m outdoors or with a long veg. Indoors you control the height by vegging less, flipping to 12/12 early, and topping. Expect it to stretch after the flip, so leave vertical clearance, or grow it outdoors where the size turns into more yield.
How strong is CR+?
CR+ sits at a solid 20 to 22% THC, medium by modern standards. The effect is balanced and approachable rather than overwhelming: happy, relaxed, and talkative, which makes it a good social or all-day strain. You grow CR+ mainly for its huge yield, with the potency a dependable bonus.
Can you clone CR+?
Yes. As a photoperiod strain, CR+ clones well, unlike autoflowers. Take cuttings from a healthy plant during veg, root them, and keep them under long light until you are ready to flower. Cloning lets you keep a favorite high-yielding phenotype and skip germination on your next run.
