Black Jack Seeds

Presented in the Outback Seed Bank catalogue, Black Jack is a feminised photoperiod variety combining Black Domina × Jack Herer genetics. Its balanced 50% sativa and 50% indica profile brings together vigorous growth, generous branching and dense flower formation. This intermediate-level option is suited to growers ready to manage height, airflow and seasonal timing.

Genetics & effects

Black Jack is listed with a THC range of 16–21% and CBD of 0.1–0.6%. Its aromatic profile is led by caryophyllene, myrcene and terpinolene, with earthy, floral and peppery flavours. Individual experiences vary, but some people describe the effects as initially uplifting, euphoric or focused, followed by a happy and relaxed finish. Setting, personal sensitivity and flower composition may shape the subjective experience.

The variety’s balanced lineage can appeal to those seeking a versatile addition to a feminised seed collection. Its contrasting floral and peppery notes may also make it a favourite among growers who appreciate layered aromas rather than straightforward sweetness.

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

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

Growing in Australia

Black Jack is suited to hot, dry and temperate conditions. In Australia, outdoor planting typically aligns with spring, from September to November, while the main harvest window falls between March and May. Exact timing depends on latitude, local weather and the chosen start date. Cultivation should only occur where authorised, with growers responsible for checking the rules that apply in their location.

This photoperiod variety requires a seasonal light shift outdoors or a managed lighting schedule indoors to begin flowering. Its intermediate difficulty reflects the need for attentive canopy management and regular observation, particularly when plants are growing quickly.

Indoor

Indoors, plants may reach up to 170 cm, so adequate vertical space is important. Early shaping and an even canopy can help distribute light across productive branches. Good air movement around the foliage and flowers can reduce the risk of excess humidity and mould. The listed flowering period is approximately 8–9 weeks.

Indoor yields are listed at up to 500 g/m² under suitable conditions. This figure is a catalogue estimate rather than an assured outcome; lighting, environment, plant health, container size and grower experience all influence final performance.

Outdoor

Outdoors, Black Jack may grow up to 270 cm where root space, sun and weather are favourable. Choose a bright position with airflow and enough room for lateral development. Support can be useful as branches gain weight later in the season. In humid districts, spacing plants well and inspecting dense growth after rain may help reduce mould risk.

Outdoor yields are listed at up to 700 g per plant. Actual results can vary substantially with climate, soil, seasonal conditions and cultivation approach.

Harvest

Australian outdoor harvest generally falls from March to May. Indoor plants are usually ready after their listed 8–9 week flowering phase, though plant appearance should guide timing. As harvest approaches, aromas may become more pronounced and flowers denser. Careful handling and a clean, well-ventilated post-harvest space help preserve colour, aroma and overall flower quality.