Black Jack Auto Seeds

Genetics & effects

Black Jack Auto is a feminised autoflower presented in the Outback Seed Bank catalogue. Its lineage combines Jack Herer, Black Domina and autoflowering ruderalis genetics, producing a balanced profile described as approximately 50% sativa and 50% indica. Compact growth and a short flowering phase make it an approachable option for beginners and growers working with limited space.

Catalogue figures place THC at 18–23% and CBD at 0.1–1%. Individual experience can vary, but some people describe the effects as initially uplifting, energetic or focus-friendly, followed by a calmer and more relaxed feeling. Others may notice a creative frame of mind. The aromatic profile may combine sweet berry and blueberry notes with sour edges, spicy incense and an earthy depth associated with myrcene, caryophyllene and pinene.

Explore autoflower seeds, high thc seeds, the Australian grow guide, and the planting calendar.

Explore autoflower seeds, high thc seeds, the Australian grow guide, and the planting calendar.

Growing in Australia

Australia’s varied conditions call for a location-specific approach. Black Jack Auto may suit hot, dry regions, temperate areas and cool districts with shorter summers. Autoflowering plants begin flowering according to age rather than a change in daylight, offering flexibility where seasonal conditions are less predictable. Always check the rules that apply in your state or territory before acquiring or cultivating seeds.

For outdoor cultivation, the conventional spring planting window is September–November. Choose the warmer part of that period in cool areas, while growers in hot regions may favour timing that avoids the most intense summer heat. Good airflow, steady moisture management and shelter from prolonged rain can reduce risk from mould and weather stress.

Indoor

Indoors, plants are listed at around 60–110 cm, making them suitable for compact rooms and tents. Use a light, well-draining medium and avoid frequent heavy watering. Gentle low-stress shaping early in vegetative growth may help open the canopy, but major pruning can be difficult for a fast autoflower to recover from.

• Flowering: approximately 6–7 weeks once bloom begins
• Indoor yield: catalogue estimate of up to 550 g/m²
• Difficulty: beginner-friendly, with attentive moisture control

Browse more autoflower seeds or compare the wider feminised seed collection.

Outdoor

Outdoor plants are also expected to reach roughly 60–110 cm. A sunny position, free-draining soil and airflow around the foliage support healthy development. In humid coastal districts, keep branches spaced and inspect dense flowers after rain. In hot, dry areas, mulch can help moderate root-zone temperature and moisture, while morning watering limits prolonged dampness overnight.

Outdoor yield is listed at up to 250 g per plant under favourable conditions. Actual height, colour, aroma and production depend on phenotype, weather, container size, nutrition and grower experience, so catalogue figures should be viewed as guides rather than promises.

Harvest

Australia’s broad outdoor harvest season generally falls from March–May, although autoflowers started in spring may finish earlier because their schedule is age-driven. Track flower maturity directly rather than relying only on calendar dates. Once ready, careful cutting, slow drying in a dark space and clean storage can help retain the sweet berry, sour spice and incense qualities that may make this cultivar a favourite.