Black Muffin F1 Fast Version by Sweet Seeds

Black Muffin F1 Fast Version combines three things growers love: speed, color, and potency. Part of Sweet Seeds’ F1 Fast Version line, it is a feminized, photoperiod-dependent hybrid bred with autoflowering genetics so it finishes in only about 7 weeks of flowering. It is not an autoflower, so indoors it still needs 12/12 light to bloom.

In approximately 60% of plants, the buds turn dark purple or reddish during flowering, giving the harvest a dramatic look. The thick, compact flowers are soaked in aromatic resin that smells sweet and sour, with lemon, mandarin, and tart red berries.

This 60% Indica / 40% Sativa hybrid carries 17–25% THC and yields 500–600 g/m² (1.64–1.97 oz/ft²) indoors and 400–600 g/plant (14.1–21.2 oz/plant) outdoors. Sweet Seeds reports one award for the strain so far.

Black Muffin F1 Fast Version Genetics

Black Muffin F1 Fast Version is a first filial generation (F1) cross between a photoperiod elite clone of Sweet Seeds’ Red Hot Muffin (SWS83) and the select autoflowering strain Black Lemon Auto. The Red Hot Muffin side brings red flowers, potency, and fruity sweetness, while Black Lemon Auto contributes ultra-fast flowering and a sharp citrus edge.

Listed as SWS111, the hybrid shows vigorous growth and long side branches that carry thick, compact buds. The cross preserves the strengths of both parents: color, speed, complex aromas, and a well-rounded effect.

Aroma, Flavor, and Effect

The aroma is thick, potent, and sweet and sour. Fresh lemon and mandarin lead, followed by a tart undertone of red forest berries. It is like a fresh muffin topped with lemon glaze and a handful of tart red berries, sugary and tangy at once.

The flavor lingers on the palate for minutes, with citrus on the inhale and fruity sweet-and-sour notes on the exhale. Slightly acidic hints of red berries keep each hit fresh.

The high is intense yet balanced. It starts stimulating and happy, encouraging conversation and imagination, then gently shifts into soothing body relaxation without fogging the mind. It fits social gatherings, artistic projects, or simply enjoying the moment.

Growing Black Muffin F1 Fast Version Indoors and Outdoors

Indoors, veg under 18/6 until the plants fill the space, then switch to 12/12. Flowering lasts about 7 weeks, so a full indoor run is much shorter than with standard photoperiod strains. The long side branches respond well to topping and LST, and a SCROG net helps those branches develop into thick, even colas.

To encourage purple and red tones in plants that carry the trait, many growers drop night temperatures slightly during the final weeks. Keep humidity moderate and airflow strong around the compact, resinous buds, and use a carbon filter once the sweet-and-sour aroma ramps up.

Outdoors, the plant follows the natural light cycle but finishes earlier than typical photoperiod strains thanks to its fast flowering. That is a clear advantage in climates with short summers or early autumn rain. In full sun and good soil, each plant can produce 400–600 g (14.1–21.2 oz).

Black Muffin F1 Fast Version Characteristics

Strain type	Feminized, photoperiod (F1 Fast Version)
Variety code	SWS111
Genetics	Red Hot Muffin (SWS83) elite clone x Black Lemon Auto
Indica/Sativa	60% Indica / 40% Sativa
THC	17–25%
CBD	0.1%
Effect	Stimulating, creative, relaxing, happy
Aroma/Flavor	Sweet and sour, lemon, mandarin, forest fruits, citrus
Indoor yield	500–600 g/m² (1.64–1.97 oz/ft²)
Outdoor yield	400–600 g/plant (14.1–21.2 oz/plant)
Flowering time	7 weeks indoors
Best cultivation technique	Topping, LST, and SCROG

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