Description
More About Our Sirius Black Seeds and How to Grow Them
Sirius Black is an indica-dominant hybrid with a 70% indica and 30% sativa profile. Whimsical yet calming, its 19% THC levels sit comfortably at the high end of average.
In the 1980s, two Oregon breeders set out to create an especially dark cultivar; Sirius Black was the result. In response to its eye-catching hue, one breeder remarked “that’s some serious black”—and the name stuck. Sometime during the following decades, the spelling changed, perhaps as a nod to the bright-burning dog star, or a reference to the fictional wizard, Sirius Black.
Many growers enjoy Sirius Black for its grape-like, earthy aroma; others for its fine-tuned cannabinoid profile and indica-leaning effects. Its predictable flowering period of 50-65 days and sturdy structure also make Sirius Black seeds a great choice for growers who like reliable outcomes.
Dominant Terpenes in Sirius Black
Sirius Black’s dominant terpenes include myrcene, caryophyllene, and pinene. Myrcene gives this strain much of its earthy, fruity depth, creating a soft, rounded base that often comes across as dark and slightly sweet. Caryophyllene adds a peppery, spicy layer, providing added weight, while pinene contributes a fresh pine note that lifts the overall profile.
Together, these terpenes shape the strain’s signature scent into something rich, layered, and distinctly bold. Instead of reading as simply sweet or fruity, Sirius Black comes across with more dimension: earthy on the inhale, spicy through the middle, and fresh at the finish. That balance is a big part of what makes the strain memorable, especially for growers and consumers who prefer deeper, more complex aromas.
Potency & Yields
Sirius Black reaches THC levels of up to 19%, offering moderate potency that delivers noticeable psychoactive effects. This cannabinoid profile provides a balanced experience with enough intensity to satisfy many users, especially those who prefer manageable potency levels.
Sirius Black plants typically grow 50 to 70 inches tall and can produce yields of up to 400 g/m² indoors and head-turning harvests of up to 1,000 g per plant outdoors under suitable growing conditions.
Ideal Conditions For Growing Sirius Black Seeds
Avoid shocking your plants with cooler temperatures
Sirius Black’s deep purple, nearly black tones tend to show up on their own, and won’t necessarily require cooler nighttime temperatures to develop fully. Especially cold temperatures can also stress your plants, slow growth, and reduce the final quality. For new growers, in particular, the safest approach is to keep the environment stable and let your plants express their colors naturally.
Keep humidity lower during the flowering stage.
Sirius Black tends to produce dense buds, which can trap moisture more easily than airy ones. As such, this strain benefits from lower humidity during flowering and steady airflow around the canopy. If the air stays too wet, the risk of mold or mildew goes up, especially in the thicker inner parts of the plant where moisture lingers longer.
Aim for about 40–50% humidity once flowering is underway, and use a fan to keep air gently moving through and around the branches. Avoid letting leaves and buds sit packed tightly together, because crowded flowers dry more slowly. For beginners, the main idea is simple: the thicker the buds get, the more important dry, moving air becomes.
Less is more
Sirius Black usually responds well to good light and a solid feeding program during vegetative growth, which helps the plant build a strong structure before flowering. Too much fertilizer can create unnecessary stress, while a careful ramp-up gives you a better chance of healthy growth and fuller flowers later on.
Begin by feeding your plant half of what is recommended on the package. Begin increasing the amounts, but only if your plants continue to appear healthy and don’t have any signs of nutrient burn or stress. It’s also important to provide your Sirius Black plants with bright light so they can use these nutrients effectively. The key is to support your plants without overwhelming them.
Cannabinoid Levels
Strain Overview
Genetic Makeup
Flavors & Notes
Berry
Earthy
Additional information
| Strain Type | Indica-Dominant Hybrid |
|---|---|
| Seed Type | Photoperiod |
| % Sativa | 30% |
| % Indica | 70% |
| THC | 19% |
| CBD | Low |
| Harvest Indoor | 13 – 15 oz/ft2 (360 – 440 gr/m2) |
| Harvest Outdoor | 32 – 39 oz/ft2 (900 – 1100 gr/m2) |
| Yield Category | Very Heavy |
| Flowering Time | Average (50-65 Days) |
| Height (in) | 50-70 inches |
| Effects | Creative, Euphoric, Happy, Uplifting |
| Flavor | Berry, Earthy, Grape |
| Best Time of Use | Anytime |
Strain Details
| Strain Type | Indica-Dominant Hybrid |
|---|---|
| Seed Type | Photoperiod |
| % Sativa | 30% |
| % Indica | 70% |
| THC | 19% |
| CBD | Low |
| Harvest Indoor | 13 – 15 oz/ft2 (360 – 440 gr/m2) |
| Harvest Outdoor | 32 – 39 oz/ft2 (900 – 1100 gr/m2) |
| Yield Category | Very Heavy |
| Flowering Time | Average (50-65 Days) |
| Height (in) | 50-70 inches |
| Effects | Creative, Euphoric, Happy, Uplifting |
| Flavor | Berry, Earthy, Grape |
| Best Time of Use | Anytime |
Customer Reviews
4.4
100% Recommended (60 of 60)
Only logged in customers who have purchased this product may leave a review.
baker04 (verified owner)
Upgrading my filtration ahead of flower made a real difference here, the smell genuinely testing the limits of my usual setup.
realDrew02 (verified owner)
Genuinely one of the more forgiving grows I’ve taken on recently, tolerating a real heat stretch without any visible complaint.
bobby_canyon78 (verified owner)
This strain’s flavor opened with a mild citrus tang on the inhale before settling into a smooth, lingering herbal exhale.
miguelk (verified owner)
First smoke settled in with a clear, euphoric lift that carried through part of the evening before easing into a full-body calm.
LorenzoC81 (verified owner)
The citrus and herbal combination in the aroma reminded me exactly of a well-stocked kitchen, genuinely one of the more distinctive smells I’ve grown.
epic_nexus_90 (verified owner)
This plant genuinely surprised me with how little it demanded, considerably more forgiving than the intermediate difficulty rating I’d read beforehand suggested.
justcourtney84 (verified owner)
Structural data confirmed notable accessibility for this cultivar, exceeding documented intermediate difficulty classification based on observed minimal training requirements. Growth habit naturally consolidated into a compact, densely foliated structure absent aggressive training intervention. Height remained notably compact under outdoor conditions, correlating with favorable heat tolerance. Harvest timing assessment relied on trichome coloration monitoring, with extended maturation correlating with documented shift toward more pronounced sedative characteristics. Bud morphology developed dense structure with notable purple pigmentation extending into foliage and distinctive milky white pistil development. Aromatic intensity necessitated proactive filtration by late flower. Aroma profile consolidated into sweet, herbal characteristics with citrus secondary notes. Flavor exhibited notable inhale-to-exhale contrast. Reported effects aligned with a rapid-onset, balanced profile consistent with aggregated data for this genetic background.
Pearl_T (verified owner)
This plant’s aroma built into something genuinely complex by late flower, sweet herbal notes with citrusy lemon filling the whole space.
lb69 (verified owner)
First smoke opened bright and talkative, making the evening feel social, before settling into something calmer as the night wound down.
LLOJAC23 (verified owner)
This strain’s resilience to real heat genuinely impressed me, tolerating a stretch of intense afternoon sun without any visible stress.