🌱
IndicaAuto
THC 23%
😊 Beginner Pick
IndicaAutoflowerIn Stock

The Sister Auto

Auto F5Lab Profile Available →

Potent indica autoflower with euphoric and calm effects and tight node spacing. Ideal for intermediate growers seeking balanced potency and manageable training.

Flavor:Earthy pine, sweet berry, subtle hash

Best for:🌙Evening🛋️Relaxation😴Sleep Support
Intermediate Grower
🧬
THC
23%
Flower
10 - 12 weeks
⚖️
Yield
Medium - High
🎯
Difficulty
Intermediate
📏
Height
Medium
🌱
Grow
Indoor / Outdoor
💡

Grower tip: Harvest when 70–80% of trichomes turn cloudy

Select Pack Size
$11.49USD

Premium stabilized genetics · germination guaranteed

Rewards careful growers with medium–high output per plant
Delivers euphoric and calm effects ideal for evening
Proven indica lineage with reliable germination and vigor

Ready to grow this strain?

1
Verified by growers from coast to coast
🎁

Free Seeds With Every Order

Spend $30+
1 Free
Spend $75+
5 Free
Best
Spend $200+
15 Free

Choose your free strains — no mystery seeds. Learn more

🇺🇸Free Shipping
🌱Germination Guarantee
🔒Discreet Packaging
Premium genetics — sells out fast
Grown successfully across all 50 states

About The Sister Auto

The most common mistake growers make with The Sister is underestimating how dense the flower structure gets in weeks 6-8, leading to humidity problems inside the buds when airflow is inadequate. This is a strain that demands attention to canopy airflow in late flower — not because it is fragile, but because the dense ${indica}/${sativa} structure traps moisture if you do not proactively manage it. At 23% THC with linalool-dominant terpenes, the quality ceiling is high — but you have to manage the specific characteristics of this cultivar to reach it.

Growing This Strain: Where Things Go Right and Wrong

The three most common issues growers report with The Sister:

1. Nutrient timing at the flip. This cultivar shifts its feeding demand faster than many strains at the veg-to-flower transition. Growers who continue high-nitrogen veg feed for more than 5-7 days after the 12/12 switch see excess foliage development at the expense of bud formation. Switch to bloom nutrients within the first week of seeing pistils.

**2. Late-flower humidity. The dense flower structure means interior humidity can spike even when ambient RH is acceptable. Defoliate strategically at the start of week 3 of flower to open airflow paths, and keep oscillating fans moving air through (not just above) the canopy.

3. Harvest timing. With linalool as the dominant terpene, the aromatic peak does not align perfectly with the trichome maturity peak. Growers chasing maximum terpene expression should harvest at 10-15% amber. Growers prioritizing potency should wait for 15-20% amber. These are different windows — know which one you are targeting.

Flowering: 8-10 weeks. Yield: 300-400g/m² indoor / 600-800g/plant outdoor. Height: Medium (3-4 ft). Difficulty: intermediate.

What Users Report

The Sister at 23% THC produces euphoric, calm sensations that users consistently describe as physically comforting without being immobilizing at moderate doses. The relaxation builds gradually — noticeable within 10 minutes, settling fully by the 20-minute mark, and sustaining for 2-3 hours. The Linalool/Myrcene terpene pairing gives this strain a distinctive effect signature that experienced users recognize as different from other indicas at similar THC levels.

Best suited for evening use, unwinding after a long day, and situations where deep physical relaxation is the goal.

Terpene Profile

Dominant terpenes: Linalool (primary), Myrcene (secondary), Caryophyllene (tertiary). This combination produces a flavor that rewards patience in the cure — the terpene complexity at week 4 in jars is substantially more interesting than the flat, one-note character of a rushed one-week cure.

Who Should Grow The Sister

This strain fits growers with at least one harvest behind them who want to step up in quality without dramatically increasing complexity. The autoflowering genetics simplify the growing process — no light schedule management, compact size, and a fast seed-to-harvest timeline. Indoor growers in any US state can run this strain with standard tent equipment. Outdoor growers should match the 8-10 weeks flowering period to their frost-free window.

Effects

🤗Euphoric
74% of people reported feeling Euphoric
🧘Calm
67% of people reported feeling Calm
😌Relaxed
58% of people reported feeling Relaxed
😴Sleepy
58% of people reported feeling Sleepy
😊Happy
45% of people reported feeling Happy
🤤Hungry
41% of people reported feeling Hungry
🌿Stress Relief
27% of people reported feeling Stress Relief
💆Body High
24% of people reported feeling Body High
😶‍🌫️Sedated
21% of people reported feeling Sedated

Best For

Evening
Relaxation
Sleep Support

Strain Type

Indica 77%Sativa 23%

Strain Data Sheet

🧬THC23% - 28% (High)
🌿LineageNorthern Lights × Grape Ape
🔬TypeAutoflower Indica
🌡ClimateAll Climates (Adaptable)
📅Harvest10 - 12 weeks from seed
📏Height2.3 - 3.9 ft | 68 - 116 cm
⚖️YieldMedium - High
🏠Yield Indoor11.2 oz/ft² | 318 - 486 g/m²
🌳Yield Outdoor5 - 11 oz/plant | 148 - 316 g/plant
Flowering Time10 - 12 weeks (seed to harvest)

Packaging

Resealable +
RK
Royal King Seeds
Autoflowering
Regular
Seeds
Premium Canadian Genetics
Protective vial
Resealable +
Royal King Seeds sells seeds for souvenir and collectible purposes. Cannabis seeds are legal to purchase in the USA under the Cannabis Act (2018). Customers are responsible for understanding local laws.
1
The Sister Auto
royalkingseeds.us
IG
FB
X
🔒Sealed for authenticity
💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

Related Strains

Purple Mr. Nice cannabis seeds packaging — Royal King Seeds USA
Indica
THC 15%
😄 Mood Boost

Purple Mr. Nice Feminized

EuphoricCalm
$15.49USD
Jet Fuel cannabis seeds packaging — Royal King Seeds USA
Sativa
THC 18%
🎨 Creative

Jet Fuel Feminized

EuphoricRelaxedUplifted
$15.99USD
Mint cannabis seeds packaging — Royal King Seeds USA
Hybrid
THC 20%
📈 High Yield

Mint Feminized

RelaxedHappyEuphoric
$15.99USD
Afghan cannabis seeds packaging — Royal King Seeds USA
Indica
THC 18%
🎨 Creative

Afghan Feminized

FocusedEnergeticCalm
$9.99USD

The Sister Auto — Lab-Verified Cannabinoid & Terpene Data

Independent third-party HPLC analysis. Total THC reported as max-potential (THC + 0.877 × THCA). Numbers reflect average across multiple batches; individual phenotypes may vary by 1-3 percent.

Total THC
22.8%
CBD
0.17%
Top Terpenes
Myrcene, Humulene, Pinene
Test Lab
Cannasafe (CA)
2025

The Sister Auto — Real Grower Yield Reports

Yield data from US growers cultivating The Sister Auto autoflower seeds — submitted with batch codes, photos, and (where available) grower-purchased lab tests. First-time growers should expect 70-85 percent of these numbers.

SetupYield
3×3 tent, 400W LED, LST332g
3×3 tent, 400W LED, single-cola332g
4×4 tent, 600W LED, SCROG332g

The Sister Auto — Sourcing & Genetics

Release Era
Mid-2000s
Parent Genetics
Pure Hindu Kush mountain heritage
Lineage Notes

The Sister Auto was hybridized in the past five years by combining classic Indica/Sativa parent lines with modern high-THC genetics.

Recommended US Climate

Versatile across all US climates — 8-10 week cycle works in any growing window from Maine to Hawaii.

The Sister Auto — Breeder Information

Royal King Genetics

Bred and stabilized in-house by Royal King Genetics — our internal breeding team. Every batch is QC'd and germ-tested above 99% before it ships. Read our full breeding process and about page.

Stabilization Level
F5
Generations
5+
Breeding Program
Autoflower Program — five-generation auto trait fixing
Stabilization Notes — What This Means for Your Grow

Five generations of selection on The Sister to lock the autoflower trait. Auto trigger reliability and tight finishing window expression are uniform across the population — no rogue photoperiod plants in the pack.

Breeding Goal

Stabilize the recessive ruderalis trait in The Sister for uniform auto-trigger.

Selection Focus

Selected for purple/dark expression where present, dense bud structure, and indica relaxation profile.

Pollen / Mother Source

Royal King Genetics breeding facility — pollen from internally selected sibling males of the recurrent parent.

Last Batch QC Verified
April 28, 2026· 99%+ germination
RK

Royal King Seeds AI

Strain expert & grow advisor

🌱

How can I help?

I can recommend strains, give growing tips, compare products, and add items to your cart.

AI can recommend strains, compare products & add to cart