Medusa F1 Auto by Royal Queen Seeds

Medusa F1 Auto will not turn anyone to stone, but she will leave you pleasantly stoned. Royal Queen Seeds built this true F1 autoflower from inbred lines descended from Sugar Magnolia, a thick, sweet indica, and American Beauty, a quick, fruity hybrid known for its upbeat mood.

F1 breeding means both parents were fixed into stable, pure lines before being crossed. The offspring show hybrid vigor (heterosis): fast growth, strong stems, and a crop where every plant matches the next in shape and timing. Royal Queen Seeds adds that Medusa handles rough conditions with ease.

What makes her stand out is the chemistry. Alongside very high THC, Royal Queen Seeds reports consistently high levels of CBG, giving Medusa a cannabinoid profile unlike most autos on the market. She also carries the top yield rating in the F1 range: XXXL.

Plants stretch to 2 to 3 feet (61–91 cm), often settling around 2.6 to 2.8 feet (79–85 cm), with long, strong branches and well-spaced nodes. Flowering takes 40 to 45 days (about 6 to 6.5 weeks), and the whole cycle finishes 70 to 75 days (about 10 to 11 weeks) after germination.

Mint, Pepper and Fruit With a Balanced Effect

Medusa’s terpene output is intense. The first note is cool, fresh mint with a sharp pepper kick, followed by ripe fruit, blueberry and a tangy splash of fuel on the finish. It is a lively, layered profile that changes with each pull.

Royal Queen Seeds names farnesene, myrcene and ocimene as her major terpenes, with caryophyllene also strong. Together with high THC and CBG, they produce a two-part effect: a full-body, head-to-toe relaxation and a creative, upbeat mental lift that keeps the conversation going.

The balance shifts toward heavy and sleepy late in the session, so Medusa is a good fit for creative evenings that wind down on the couch.

Growing Medusa F1 Auto: Tall Yet Manageable

Medusa grows elongated with generous internode spacing, which keeps light reaching lower branches and makes training simple. Gentle LST in weeks two to four flattens the top and evens out the canopy without slowing her down. No 12/12 flip is needed: keep her on 18/6 or 20/4 from seed to harvest.

Her flowers are thick with big, swollen calyxes, which makes trimming quick work. The one thing to watch is mold: Royal Queen Seeds notes she is somewhat susceptible to botrytis. Keep humidity moderate in late bloom, run fans, and defoliate lightly to keep air flowing around the colas.

Outdoors, she is rated for short summers. At around 10 to 11 weeks per run, many US gardeners can fit two harvests into one season.

Medusa F1 Auto Characteristics

Strain type	Autoflowering F1 hybrid (feminized)
Genetics	Sugar Magnolia x American Beauty (inbred F1 lines)
THC	Very high (with high CBG)
Effect	Balanced, creative, physically relaxing, sleepy
Flavor	Blueberry, diesel, fruity, mint, pepper
Indoor yield	XXXL (Royal Queen Seeds rating)
Seed to harvest	70–75 days (10 to 11 weeks); flowering 40–45 days (6 to 6.5 weeks)
Outdoor harvest	About 10 to 11 weeks after germination; two runs possible per season
Height	2 to 3 feet (61–91 cm)
Climate	Suited to short summers
Best cultivation technique	Low-stress training (LST), good airflow, 18/6 or 20/4 light schedule

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