Sugar Black Rose cannabis seeds packaging — Royal King Seeds UK
IndicaAuto
THC 18%
😊 Beginner Pick
IndicaAutoflowerIn Stock

Sugar Black Rose Auto

AutoflowerSee Lab Report →

Sugar Black Rose Auto — indica cannabis seeds suited to UK growing conditions. 18% THC with relaxed, sleepy, happy effects. Fast, discreet UK delivery.

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Royal King Genetics — first-party test batch

Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-10 on 375 seeds.

Germination rate: 98.6% (n=375)
Last QC test date: 2026-09-10
Indoor yield: 461-636 g/m² (avg across 13 verified grower reports)
Outdoor yield: 561-810 g/plant (avg across 8 verified grower reports)

About Sugar Black Rose Auto

Read Sugar Black Rose backwards from the harvest: 500 g/m2 under lights, 80 g/plant outdoors, with resin filling out towards 18% THC. Most of the final weight lands between weeks five and eight, when the 88/12 genetics stack calyxes quickly and the trichome cover goes from scattered to solid. Outdoors you want that stage falling in late August and early September while the light is still long, so count back to it from the first frost your own area usually sees rather than from a date on a packet.

Getting the weight out of this plant

Three stretches of the 60-70 days seed to harvest of bloom decide whether you reach the top of this strain's range (500 g/m2 indoors, 80 g/plant outdoors). The rest is maintenance.

The first ten days of flower. What the plant does during the stretch sets canopy height, and canopy height sets how evenly the light lands. Expect 20-30%, which is manageable; stripping the lowest fans around day seven sends the energy up to the sites that will actually finish.

Weeks three to five. Myrcene production climbs through here, and it responds to a day-night temperature gap of 6-8°C. British autumn nights hand that to outdoor growers for free from September; indoors you have to build it, at roughly 25-26°C lights-on and 18-20°C lights-off. Bloom feed goes potassium-heavy around EC 1.6-1.8.

The last ten to fourteen days. Stop feeding and run pH-corrected water. Check trichomes daily under a 60x loupe — cut at 15-20% amber for the weight of effect this genetics is bought for. Outdoors that lands between late September and mid-October across most of Britain, and the weather forecast should get a vote.

Flowering: 60-70 days seed to harvest. Indoor yield: 500 g/m2. Outdoor yield: 80 g/plant. Plant height: above 70 cm, normally up to 1 m or higher. Rated intermediate difficulty.

What Sugar Black Rose is actually like

Growers report relaxed, sleepy, happy as the defining characteristics and our own notes agree. At 18% THC this indica sits where dose control starts to matter. A single bowl through a vaporiser at 185°C gives a manageable physical ease with the head still working, which is what most people want at the end of a day. Push the dose and it moves firmly towards sedation — the reason it tends to become a winter evening cultivar rather than an all-year one. The Myrcene/Humulene pairing leaves earth and faint sweetness on the palate, with fruit at the end.

Best suited to quiet evenings, a film, recovery after exercise, and the hour before sleep.

Terpene breakdown

Primary: Myrcene · Secondary: Humulene · Tertiary: Linalool. These three build an aroma that keeps moving through the cure. Fresh off the dry it leads with myrcene; after three or four weeks sealed in glass at 16-18°C the linalool underneath comes up and the whole thing gains a layer. Vaporising between 180°C and 195°C catches the widest span of them, since the lighter linalool molecules are the first thing heat destroys.

Who it suits

Sugar Black Rose suits growers with the basics in place. Understand pH, rough nutrient ratios and light cycles before you commit to it; it asks for competence rather than expertise. Autoflowering genetics take the light cycle out of the equation, which suits balcony growers, anyone working around British daylight hours, and anyone who wants the whole thing over quickly. The April to October season accommodates a bloom of 60-70 days seed to harvest comfortably for outdoor growers across the country.

Effects

😌Relaxed
72% of people reported feeling Relaxed
😴Sleepy
72% of people reported feeling Sleepy
😊Happy
58% of people reported feeling Happy
🤤Hungry
54% of people reported feeling Hungry
🤗Euphoric
47% of people reported feeling Euphoric
🧘Calm
40% of people reported feeling Calm
🌿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

Strain Type

Indica 88%Sativa 12%

Strain Data Sheet

🧬THC18% - 22% (Medium-High)
🌿LineageCritical Mass × Black Domina
🔬TypeAutoflower Indica
🌡ClimateAll climates (adaptable)
📅Harvest≈ 10 – 11 weeks from seed (typical)
📏Heightabove 70 cm, normally up to 1 m or higher
⚖️YieldMedium – High
🏠Yield Indoor500 g/m2
🌳Yield Outdoor80 g/plant
⏱Flowering Time60-70 days seed to harvest

Packaging

Resealable +
RK
Royal King Seeds
Autoflowering
Regular
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers must comply with all applicable United Kingdom legislation.
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Sugar Black Rose Auto
royalkingseeds.co.uk
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💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

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Sugar Black Rose Auto — Breeder Information

Royal King Genetics

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

Stabilisation Level
F5
Generations
5+
Breeding Programme
Autoflower Stabilisation (F5) — ruderalis trait fixing
Stabilisation Notes — What This Means for Your Grow

Sugar Black Rose is our F5 autoflower line. Five rounds of selection have fixed both the autoflower trigger and the bud-to-leaf ratio the cultivar is known for. The recessive ruderalis trait demands this depth of work to express uniformly.

Breeding Goal

Lock the autoflower trait in Sugar Black Rose through five generations of selection.

Selection Focus

Chosen for indica vigour, compact bud formation and a reliable finish window.

Pollen / Mother Source

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

Last Batch QC Verified
2 September 2026· 99%+ germination