How to Grow Sirius Black
Sirius Black is a dark, resinous indica-dominant feminized strain from a secret cross. It is a 60/40 indica-leaning plant with a high 15-25% THC, a citrus, fruity, kush and woody flavor, and a relaxed, euphoric, night-time effect. Compact, easy to grow and heavy with resin, it is a beginner-friendly way to grow a potent evening indica.
This is a feminized photoperiod strain, so every seed grows into a flowering female and you start flowering by switching the light cycle to 12/12, which lets you decide how big the plant gets before you flip it. Its exact parents are kept secret by the breeder, but the result is a sturdy, resin-heavy indica with a rich citrus-kush aroma and a deeply relaxing effect.
Recommended Strains
Sirius Black
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THC | 15% - 25% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 60% Indica / 40% Sativa |
Black Domina
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THC | 15% - 20% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 95% Indica / 5% Sativa |
Sturdy, productive and approachable, Sirius Black is a rewarding indica to grow whether you are new to it or experienced. You can see the full details and buy Sirius Black seeds on the strain page, and browse the rest of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | High (15-25%) |
|---|---|
| Lineage | Secret cross |
| Type | Feminized (photoperiod) |
| Genetics | 60% Indica / 40% Sativa |
| Climate | Temperate |
| Flowering time | 9-10 weeks |
| Harvest (outdoor) | October |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.31-1.64 oz/ft² (400-500 g/m²) |
| Yield outdoor | 14.11-17.64 oz/plant (400-500 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Citrus, Fruity, Kush, Woody |
| Effects | Relaxed, Euphoric, night-time |
Promos & Deals
Growing a Feminized Strain
Sirius Black is a feminized photoperiod strain, so every seed grows into a flowering female and there is no sexing and no males to remove. Because it flowers on the light cycle rather than on age, you control the timing: keep it under long 18/6 days to grow and build the frame you want, then switch to 12 hours of light and 12 of darkness to start flowering. That control is what lets you dial in the final size and the yield.
Sirius Black grows to a manageable height of around 1.5 m with a sturdy, bushy, indica-leaning structure, which makes it easy to handle both indoors and out. It takes well to simple training to spread the canopy and open it up, and it produces dense, resin-coated buds, so a little support late in flower keeps the heavy branches upright. Veg it to the height you want, flip it, and it finishes resinous and fragrant in 9 to 10 weeks.
Climate and Where to Grow It
Sirius Black does well in a temperate climate with a warm, steady season and good airflow, and its sturdy indica genetics make it adaptable and forgiving. It is comfortable both indoors in a tent and outdoors where the season is warm enough, and it is not a demanding plant to keep healthy. Outdoors in the Northern Hemisphere it is ready to harvest around October.
Yields are high, giving around 400-500 g/m² indoors and 400-500 g per plant outdoors with good light and space. As a compact, sturdy indica of around 1.5 m it is easy to manage, so the main job is keeping the canopy open and supporting the dense colas so light and air reach the lower buds. Its potency and heavy resin make it a strong pick from our high-THC seeds.
Keep humidity sensible through flowering to protect those dense, resinous buds: around 55-60% in veg, nearer 40% as the flowers fill out, and lower toward harvest. A resin-heavy indica can trap moisture inside its tight colas, so steady airflow keeps the finish clean. Aim for daytime temperatures around 68-80°F (20-27°C), and let the nights cool a touch late in flower to bring out the darker tones in the buds.
Feeding Schedule (EC Guide)
Sirius Black is a hungry, high-yielding plant that responds well to steady, balanced nutrition. Build the feed up gradually through veg, push phosphorus and potassium once it is in flower to fuel those dense, resinous buds, then taper off for the final flush so the citrus, fruity and kush notes come through clean. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4-0.6 | Very light feed while roots establish |
| Vegetative | 0.8-1.2 | Raise nitrogen as the plant builds size |
| Early flower | 1.2-1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4-1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Once you switch Sirius Black to a 12/12 light cycle it flowers in about 9 to 10 weeks, a comfortable window for an indica of this yield. It fills out with dense, resin-soaked, trichome-coated buds that take on dark, rich tones with a cool finish, developing a citrus, fruity and kush aroma over a woody base. Outdoors in the Northern Hemisphere it is ready to harvest around October.
Yields are strong: around 400-500 g/m² indoors and 400-500 g per plant outdoors with good sun and space. Keep the dense colas supported and the canopy open so the lower buds get light, feed it steadily through flower, and harvest when most of the trichomes have turned cloudy with a few amber for the fullest citrus-kush flavor and the deepest, most relaxing effect.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry matters with such dense, resinous buds, because they can stay damp in the middle while the outside dries, and a gentle dry protects both the aroma and the dark color.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the citrus, fruity, kush and woody notes and smooths the smoke, turning a freshly dried harvest into a rich, well-rounded evening indica.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Sirius Black is a resin-heavy plant, so its trim is excellent for dry sift, bubble hash or rosin. That heavy resin and rich citrus-kush aroma make the trim genuinely valuable, turning offcuts into a potent, flavorful concentrate run rather than waste.
Flavor and Terpenes
Sirius Black leads with a citrus and fruity flavor over a deep kush and woody base, a rich, full-bodied profile with a dark, earthy edge. It is a smooth, flavorful smoke, and a good cure really brings that citrus-kush character forward in the jar and on the inhale.
Its terpene profile shapes that flavor. Limonene drives the bright, zesty citrus note that lifts the aroma, while caryophyllene adds the warm, peppery, kush-like spice and myrcene rounds it out with an earthy, fruity base that underpins its relaxing character. Together these terpenes frame the citrus, fruity and kush profile Sirius Black is known for.
Effects and Best Use
With its high 15-25% THC and indica-leaning 60/40 make-up, Sirius Black delivers a deeply relaxing experience. It is reported as relaxed and euphoric with a settled, night-time quality, pairing an easy mental lift with a heavy, comfortable body, which makes it an evening strain for winding down. Its potency can run high, so a little goes a long way.
That relaxed, euphoric, night-time profile makes it a classic end-of-day indica, good for unwinding in the evening while enjoying its citrus-kush flavor and dark, resinous looks. The combination of a compact, high-yielding grow, a potent relaxing effect and a rich aroma is exactly why this indica stands out.
Common Problems and Pro Tips
Sirius Black is a forgiving, beginner-friendly plant, so the main thing to protect is its dense, resinous buds. Those tight colas can trap moisture in late flower, so keep the air moving, hold humidity down as the flowers fill out, and defoliate a few of the largest fan leaves in mid-flower so light and air reach the lower buds. A clean, dry finish protects both the aroma and the resin.
Because it is a heavy yielder on a compact frame, support the branches so they do not fold under the weight of the resin-heavy buds, and let the nights cool by a few degrees in the last couple of weeks to deepen the dark tones. Start seedlings gently to avoid transplant stress, then let its sturdy indica genetics do the rest; it is an easy plant to keep healthy.
As a pro tip, make the most of that heavy resin by saving the trim for concentrates, and protect the terpenes: go gentle on the nutrients late, finish with a proper plain-water flush, and give it a full three to four week cure. Harvest when most trichomes are cloudy with a few amber for a rich, relaxing result with the citrus-kush flavor and dark looks this strain is prized for.
FAQ
Is Sirius Black a feminized strain?
Yes. Sirius Black is a feminized photoperiod strain, so every seed grows into a flowering female and there is no sexing and no males to remove. Because it flowers on the light cycle rather than on age, you veg it under long 18/6 days for as long as you like, then switch to 12/12 to start flowering, which lets you control its final size and yield.
How much THC does Sirius Black have?
Sirius Black is a high-THC strain, testing anywhere from around 15% up to 25% depending on the phenotype and how it is grown. Combined with its indica-leaning 60/40 genetics, the result is a relaxed, euphoric, night-time effect. Because the potency can run high, it is worth dosing carefully, especially if you are newer to strong indicas.
How long does Sirius Black take to flower?
Sirius Black flowers in about 9 to 10 weeks once you switch it to a 12/12 light cycle indoors, a comfortable window for an indica of this yield. Outdoors in the Northern Hemisphere it is ready to harvest around October. A cool, well-ventilated finish helps bring out both the citrus-kush aroma and the dark tones in the buds.
What does Sirius Black taste like?
Sirius Black has a citrus and fruity flavor over a deep kush and woody base. Limonene drives the bright citrus note, caryophyllene adds a warm, peppery kush spice, and myrcene brings an earthy, fruity depth. A proper three to four week cure really brings that citrus-kush character forward on the inhale and smooths the smoke.
How much does Sirius Black yield?
Sirius Black is a high yielder, giving around 400-500 g/m² indoors and 400-500 g per plant outdoors with good sun and space. Support the dense colas, keep the canopy open, feed it steadily through flower, and give it good light so the resin-soaked buds develop fully and heavy right down the plant.
Is Sirius Black good for beginners?
Yes. Sirius Black is beginner-friendly: it is a sturdy, forgiving feminized plant with no sexing to worry about, a manageable height and an easy 9 to 10 week flowering. Just keep the air moving around its dense buds and support the heavy colas late in flower, and a first-time grower can get a strong, resinous harvest from it.
