Sirius Black Feminized Seeds

Feminized Sirius Black strain seeds grow into indica-leaning plants famous for deep purple buds with berry, grape, and plum flavors. THC lands at 15–20% with uplifting and relaxing effects, perfect for winding down in the evenings. Beginner-friendly and resilient, these Sirius Black seeds grow indoors or out, flowering in 8–10 weeks with solid, picture-perfect yields.

Sirius Black strain seeds are feminized cannabis seeds that produce easy-growing indica-dominant plants with berry-grape and plum flavors, 15–20% THC, and uplifting, relaxed effects. Since they're feminized, these Sirius Black seeds grow into bud-bearing females about 99% of the time. That means virtually no males and no seed-filled buds.

Famous for its visually striking purple-hued buds, the Sirius Black strain has a mysterious lineage tracing back to the 1980s. Those genetics deliver a medium-sized plant that’s dense, bushy, and resilient, perfect for beginners and seasoned growers alike.

The Sirius Black strain’s genetics have never been disclosed, but we do know it comes from the Portland-based Oregon Breeders Group. They bred it as a tribute to a long-lost dark purple indica the founders grew in the late 1970s and early 1980s. Earning the nickname “serious black,” Sirius Black is known to purple up, even without cold stress.

Feminized Sirius Black seeds are easy to grow if you have a run or two under your belt, and attentive beginners can handle them too. They reward steady feeding and good airflow more than constant intervention.

As indica seeds, Sirius Black weed seeds develop into medium-height plants with thick branches and dense foliage, resembling Christmas trees when left untrained. They respond well to training techniques like topping, lollipopping, and Sea of Green (SOG), which spread light more evenly through the canopy for bigger, better buds.

You can grow Sirius Black cannabis seeds indoors or out, in soil or hydroponic setups. As long as the plants get enough light, water, and food, they’ll flourish without too much additional TLC.

Sirius Black weed plants do best in sunny, warm climates with moderate humidity during veg and drier air through flower.

Outdoor growers should sow in sunny spots exposed to a light breeze. Aim for at least six hours of daily sunlight exposure but install shading if the summer temps regularly surpass 90°F. Plant your Sirius Black seeds outside once spring nights stay mild, but bring the pots indoors if nighttime temps fall below 55°F.

Indoor growers should maintain 70–80°F temperature ranges in vegging and 75–85°F in flowering. Relative humidity (RH) levels should be 45–55% and 35–45%, respectively. Gradually reduce moisture levels as the bloom stage approaches, dropping RH by 5% each week.

Keep air moving through the canopy in late flower. Sirius Black packs its buds tight, and dense colas hold moisture that can turn into bud rot if humidity creeps up.

Sirius Black strain seeds produce hungry plants that prosper on a generous feeding schedule. Start with a half-dose of nitrogen-rich solution in early vegging. Gradually move to a full dose when they’re growing vigorously and adding new nodes steadily. Once flowering begins, switch to a bloom formula.

Flowering-specific nutrients carry more phosphorus and potassium and less nitrogen to support bud development. The plants still use some nitrogen while they stretch during the first weeks of flower, so taper it down gradually.

Some growers feed plain water for the last week or two before harvest, which is known as flushing. Whether it improves flavor or smoothness is still debated, so treat it as optional. Other growers simply taper off nutrients for those final weeks instead.

You can also sow in organic soil to cut back on bottled nutrients. Watch for deficiency symptoms, though, and be ready to supplement if your Sirius Black plants look weak.

Sirius Black flowers for 8–10 weeks indoors after the flip to 12/12, and outdoor plants are ready to harvest around mid-October, before the first frost. For a medium-sized crop, yields are pretty solid, though most growers are more concerned about Sirius Black’s prized bud quality over harvest quantity alone.

Once flowering is underway, keep conditions warm and relatively dry. Wrap up high-stress training before the stretch ends and stick to light pruning to manage the bushiness. Stress can push any cannabis plant to throw hermaphroditic flowers, so keep the environment stable through bloom.

Trichomes are the most reliable harvest signal. Check them with a loupe and harvest when most have turned cloudy with a few going amber (about 15–20% is the general standard). Darkening, curling pistils are a useful secondary sign.

Expect large, dense, pinecone-shaped buds with deep purple calyxes and sugar leaves, orange pistils, and a sticky coat of trichomes.

Sirius Black opens with an uplifted, upbeat headspace and settles into deep body relaxation. That arc makes it a good fit for late afternoons sliding into evening. THC is high (15–20%) and CBD is low (0–1%). The indica-leaning effects tend to build gradually, so give it time before going back for more.

The first few hours bring a chatty energy and open-mindedness without sending you to the cerebral heights of a potent sativa.As time passes or you increase the dose, Sirius Black’s indica side becomes more apparent. Waves of warm relaxation roll through your limbs until you’re happy to sit back, breathe deep, and let the couch lock carry you off.

Smoke with care to temper this strain’s psychoactive punch. Large doses may leave you too sleepy to enjoy the ride. Red eyes and cottonmouth are the two most common side effects.

Sirius Black is all about rich, dark fruit, with berry, grape, and plum leading from the growing plant through to the exhale. Its main terpenes are myrcene, limonene, and linalool.

Maturing flowers ooze ripe berry and grape scents over a grassy base. Drying and curing deepen their fragrance, adding musky notes to the sweetness. Fruity, slightly tart overtones mingle with a woody aroma, making the buds reminiscent of potpourri.

Light up, and Sirius Black’s flavors come to life: think sun-kissed grapes and wild berries with a zesty plum tang over gentle earthy spice. The aftertaste is floral and surprisingly mellow.

Buy Sirius Black seeds online from Seed Supreme and get a germination guarantee. Discreet shipping is available to all 50 US states, free on $99+ orders. As a bonus, orders over $50 earn free seeds too. Like all of our cannabis seeds, Sirius Black feminized seeds are of the highest quality with top-tier genetics sourced from world-class breeders.

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Yes, purple coloring is part of Sirius Black's genetics, but like any trait it can express differently from one phenotype to the next. Some plants turn deep purple, others show only partial color, and an occasional plant may stay mostly green. Potency and flavor are unaffected either way.

Yes, a Sirius Black cannabis plant can be kept in veg as a mother plant and cloned, which isn't practical with autoflowers. Each clone is a genetic copy of its mother, so cloning lets you keep a plant whose color, structure, and flavor you liked.

Sirius Black is an indica-dominant cannabis strain tracing back to the 1980s with undisclosed genetics, famous for its deep purple buds, high THC, and rich berry-grape flavors. If you want to grow it yourself, buy Sirius Black cannabis seeds at Seed Supreme.