RS11, also known as Rainbow Sherbet #11, is a Blimburn Seeds sativa-dominant hybrid prized for serious potency and a complex flavor. From Sunset Sherbet x Pink Guava x OZK, it is a feminized photoperiod plant carrying a very high 27-31% THC, with a citrus, fruity, kush, and woody profile and an energetic, creative, euphoric effect. The one thing to plan for is patience: it runs a long 10-12 week flower, and the reward is worth the wait. 

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. The figures below are Blimburn’s breeder values; check your own pack for the exact numbers. 

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THC THC 31% - 32% (High)
Lineage Lineage Strawberry Diesel Strain x OG Kush Strain
Type Type Feminized
Height Height 6.56 ft | 2 m
Yield Yield High
Yield Indoor Yield Indoor 1.97 - 2.13 oz/ft² | 600 - 650 g/m²
Flowering Time Flowering Time 9 - 10 weeks
Phenotype Phenotype 40% Indica / 60% Sativa
Effects Effects Relaxed, Uplifted, Creative
Flavors Flavors Fruity, Sweet, Apricot, Citrus
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Yield Indoor Yield Indoor 1.64 - 1.97 oz/ft² | 500 - 600 g/m²
Yield Outdoor Yield Outdoor 26.46 - 35.27 oz/plant | 750 - 1000 g/plant
Flowering Time Flowering Time 8 - 9 weeks
Phenotype Phenotype 40% Indica / 60% Sativa
Effects Effects Relaxed, Calming, Focused
Flavors Flavors Pine, Tropical, Fruity

RS11 Grow Info 

Trait RS11 (Blimburn) 
Genetics Sunset Sherbet x Pink Guava x OZK 
Seed type Feminized photoperiod 
Genetic profile 40% indica / 60% sativa 
THC 27-31% (high) 
Flowering time 10-12 weeks 
Height Around 1.5 m 
Indoor yield Medium, around 350-450 g/m² 
Outdoor yield Around 450-550 g per plant 
Effects Creative, energetic, euphoric 
Flavor Citrus, fruity, kush, woody 

These are Blimburn’s published figures for the RS11 line at Growlantis. When you need an exact THC percentage, height, or yield, check the specification on your own RS11 seed pack. 

What Makes RS11 Worth Growing 

RS11’s draw is top-shelf potency and flavor. Its Sunset Sherbet, Pink Guava, and OZK heritage produces a complex citrus, fruity, kush, and woody profile and a very high 27-31% THC, which puts it among the strongest strains you can grow. The effect is energetic, creative, and euphoric, a daytime, get-things-done high rather than a sedative one. 

The trade-off is time. RS11 runs a long 10-12 week bloom, so it is a project for a grower who is happy to wait for quality. In return you get dense, resinous, high-THC buds with a standout flavor. It stays a manageable 1.5 m and is listed as beginner-suitable, so the plant itself is not difficult, it just needs patience. 

Is RS11 Indica or Sativa? 

RS11 is sativa dominant, listed at 60% sativa and 40% indica, from Sunset Sherbet, Pink Guava, and OZK genetics. 

That shows in the effect, which is energetic, creative, and euphoric, better suited to daytime and social use than to winding down. The plant has a semi-stretchy hybrid structure with good resin. Despite the high potency, the lift is functional rather than overwhelming for experienced users. 

Flowering Time vs Full Grow Time 

Because RS11 is a photoperiod strain with a long bloom, these two numbers matter more than usual. 

  • Flowering time: 10-12 weeks. This is the bloom stage, which starts only when you switch the lights to 12/12 indoors (or when days shorten outdoors). It is longer than average, so plan for it. 
  • Full grow time (seed to harvest): flowering plus however long you veg. Indoors, a typical grow runs around 5 to 6 months from seed given the long flower. 

The practical point: the long flower is the defining feature here. Outdoors, that means a late finish, usually late October, so RS11 suits regions with a long, warm season or an indoor setup where you control the timing. 

Does RS11 Need a 12/12 Light Cycle? 

Yes. RS11 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. Because the bloom is long, flip a little earlier than you would for a fast strain if you are working to a deadline. Outdoors, shortening late-summer days trigger flowering naturally. 

rs11 cannabis plant with dense buds growing indoors under grow lights

RS11 Grow Timeline, Week by Week 

Treat this as a development pattern, not a fixed schedule, since veg length is up to you and the bloom runs long. 

  • Weeks 1-2: germination and seedling. The taproot and first true leaves establish. Keep humidity up and feeding minimal. 
  • Weeks 3-6: vegetative growth (your choice). The plant builds its frame under 18/6. This is when you top and train. 
  • Week 0 of flower: the flip. Switch to 12/12. Expect a notable stretch from the sativa side. 
  • Weeks 1-4 of flower: stretch and bud set. Vertical growth finishes and flower sites form. 
  • Weeks 5-10 of flower: bud development. Dense, resinous buds build slowly and the citrus-kush aroma deepens. 
  • Weeks 10-12 of flower: ripening and harvest. Be patient and judge by trichomes, not the calendar. 

Choosing Your Setup: Space, Light and Pots 

RS11 reaches about 1.5 m and, being sativa-leaning, stretches well after the flip, so flip to 12/12 while it is comfortably under your height limit. Low stress training or a SCROG net tames the stretch and keeps the canopy even. 

Give it strong light across the long bloom to support the very high THC. A full-spectrum LED at 30-40 watts per square foot over the flowering canopy keeps the buds dense. Pair it with a good inline exhaust fan and a carbon filter, since the aroma builds over the extended 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 across the longer cycle. 

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 70-85°F (21-29°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 RS11’s sativa stretch makes training especially worthwhile. 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 helps control the stretch. Combine it with low stress training or a SCROG net to spread the growth and expose more bud sites to light. Finish heavy training before the flip so the plant can focus on its long flower. You can also clone a plant you like before flowering to preserve its genetics. 

Feeding and Watering RS11 

Feed to the stage, and remember the bloom is long. Use a nitrogen-forward base through veg, then move to a bloom formula higher in phosphorus and potassium once you flip, and keep that feed steady through the extended flower. 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. Over a longer cycle, consistent watering habits and fabric pots keep the root zone healthy and prevent the overwatering that stalls growth. 

Flowering and Knowing When to Harvest 

Once you flip to 12/12, expect a notable sativa stretch, then dense, resinous buds build slowly over the long 10-12 week bloom. The citrus, fruity, kush, and woody aroma deepens as the flower matures, so keep air moving and run a carbon filter indoors. 

Patience pays off at harvest. Check the trichomes under a loupe and cut when most are cloudy with a few turning amber for the fullest effect. Do not rush a long-flowering strain. After harvest, hang the branches in the dark at about 60°F (15-16°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 complex flavor. 

rs11 cannabis plant during vegetative growth stage indoors

Growing Indoors vs Outdoors 

Indoors is the easier home for RS11, because you control the long bloom regardless of season. Hold 18/6 for veg, flip to 12/12 when sized right, train to manage the stretch, and the 350-450 g/m² yield is reachable under strong light over the full flower. 

Outdoors, RS11 needs a long, warm season to finish its 10-12 week bloom, usually late October, returning around 450-550 g per plant. It suits warm regions with a late fall; in shorter-season areas, grow it indoors. Give it full sun, rich well-draining soil, and airflow around the resinous buds. 

How Tall and How Much? Height and Yield 

Height is easy to plan for. RS11 reaches around 1.5 m with a sativa stretch, so flip early enough and train to keep the final canopy within your space. 

On yield it is a medium producer at around 350-450 g/m² indoors and 450-550 g per plant outdoors. The weight is moderate for the long flower, but you grow RS11 for its very high THC and standout flavor rather than for sheer bulk. Strong light and a trained canopy are what help it reach that potential. 

Best US Climates for RS11 

RS11 needs a long, warm season to finish its 10-12 week bloom outdoors, so it suits growers in California, the Southwest, and the warm, long-fall South and West who can take it into late October. 

In cooler or shorter-season states, the long flower is risky outdoors, so grow RS11 indoors where you control the timing fully. In the humid Southeast, keep airflow strong around the dense buds through the extended flower. For a faster finish, browse our full how-to-grow guide library. Note that RS11 is also a parent of the separate SLH x RS11 cross, which is a different plant. 

Common Problems When Growing RS11 

A few predictable issues are easy to head off, especially over a long flower. 

Harvesting too early 

The 10-12 week bloom tempts impatient growers to cut early. Wait for the trichomes to turn mostly cloudy with some amber, or you sacrifice potency and flavor the long flower was building. 

Underestimating the sativa stretch 

RS11 stretches after the flip. Flip to 12/12 while it is still well under your height limit, and use topping or a SCROG net to keep the canopy even. 

Bud rot late in a long flower 

The extended bloom gives mold more time to take hold in dense buds. Keep humidity moderate in late flower and air moving through the canopy, especially outdoors. 

Letting feed drift over the long cycle 

A long flower is easy to under- or overfeed. Keep the bloom feed steady and watch the plant, adjusting based on its response rather than guessing. 

Making the Most of Your Harvest 

Do not waste the trim. This very resinous strain makes excellent bubble hash, dry sift, or infused oil that keeps the citrus-kush character. The stems, roots, and fan leaves compost well and feed your next grow. 

Is RS11 Right for You? 

If you want a top-shelf, very high-THC sativa hybrid with a complex citrus-kush flavor and an energetic effect, and you are patient enough for a 10-12 week flower, yes. The plant itself is manageable and beginner-friendly; it simply rewards those who wait. If you need a fast finish, choose a quicker strain. Browse our full how-to-grow guide library for options. 

close up of rs11 cannabis bud with visible trichomes and pistils

Frequently Asked Questions 

Is RS11 indica or sativa? 

RS11 is sativa dominant, listed at 60% sativa and 40% indica, from Sunset Sherbet, Pink Guava, and OZK genetics. The effect is energetic, creative, and euphoric, better suited to daytime and social use than winding down. Despite the very high potency, the lift stays functional rather than overwhelming for experienced users. 

Does RS11 need a 12/12 light cycle? 

Yes. RS11 is a photoperiod strain, so indoors it needs a 12/12 light cycle to start and maintain flowering. Keep it on 18/6 during veg for as long as you want it to grow, then flip to 12/12 when it has the right size. Outdoors, shortening late-summer days trigger flowering naturally. 

How long does RS11 take to grow? 

RS11 has a long flowering time of 10 to 12 weeks once you switch to 12/12. Total seed-to-harvest time depends on veg length, usually around 5 to 6 months indoors. Outdoors it finishes late, usually late October. Be patient and judge the finish by trichome maturity rather than the calendar. 

How much does RS11 yield? 

RS11 is a medium yielder at around 350 to 450 g/m2 indoors and 450 to 550 g per plant outdoors. The weight is moderate for its long flower, but you grow RS11 for its very high THC and standout flavor rather than sheer bulk. Strong light and a trained canopy help it reach its potential. 

How strong is RS11? 

RS11 is very high in potency at 27 to 31% THC, among the strongest strains you can grow. The effect is energetic, creative, and euphoric, a daytime high rather than a sedative one. Its complex citrus, fruity, kush, and woody flavor makes it a genuine top-shelf cultivar for experienced users. 

Is RS11 good for beginners? 

The plant itself is beginner-friendly and manageable at around 1.5 m, so growing it is not difficult. The main challenge is patience, since the flower runs a long 10 to 12 weeks. A beginner willing to wait can grow RS11 well; those wanting a quick first harvest should pick a faster strain. 

Can you clone RS11? 

Yes. As a photoperiod strain, RS11 clones well. Take a cutting from a healthy plant in veg, root it, and keep it under 18/6 light. Cloning lets you preserve a plant you like and run repeatable harvests without buying new seeds each time, which autoflowers cannot do.