Black Jack Seeds

Genetics & effects

Black Jack is a feminised photoperiod cultivar combining Black Domina with Jack Herer. Its balanced 50% sativa and 50% indica profile brings together vigorous vertical growth, productive branching and dense flower development. THC is listed at 16–21%, while CBD is listed at 0.1–0.6%. Individual plants and finished flowers can vary according to phenotype, environment and cultivation choices.

The aromatic profile blends earthy depth with floral notes and a peppery edge. Caryophyllene, myrcene and terpinolene are among the listed terpenes. Some consumers describe the experience as initially uplifting, euphoric or focused, followed by a happy, relaxed quality. These impressions are subjective and may differ from person to person.

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

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

Growing in New Zealand

Black Jack suits intermediate growers who can manage its height, airflow and feeding across a full photoperiod cycle. It is best matched with temperate or hot, dry conditions. In New Zealand, outdoor planting is generally planned for spring, from September to November, once local temperatures are reliably suitable. Site selection should account for regional differences in wind, rainfall, humidity and autumn temperatures.

This cultivar can become tall outdoors, reaching up to 270 cm in favourable conditions. A sunny, sheltered position and enough space between plants support even light exposure and airflow. Branch support may be useful later in the season as flowers gain weight. Regular inspection helps identify moisture, pest or mould concerns early.

Indoor

Indoors, Black Jack may reach up to 170 cm, so early canopy planning is worthwhile. Topping, low-stress training or a screen can help distribute growth across the available area and keep the canopy within practical limits. Allow room for vertical extension when flowering begins.

Flowering usually takes around 8–9 weeks. Balanced airflow, stable temperatures and careful humidity control are particularly important as flowers become denser. Under suitable conditions, indoor yield is listed at up to 500 g/m². This figure is an estimate rather than an assurance, as lighting, plant health, space and grower experience all influence output.

Outdoor

Outdoor plants can form large, branched structures when given a long, sunny season. Prepare adequate root space and use supports before branches become heavily loaded. In humid districts, wider spacing and protection from prolonged rain can reduce the risk of mould. In cooler areas, consider how quickly autumn conditions change when choosing the planting position.

Outdoor yield is listed at up to 700 g per plant in favourable settings. Actual production varies with phenotype, seasonal weather, soil or growing medium, nutrition and available sunlight.

Harvest

New Zealand outdoor harvest generally falls between March and May. Timing should be based on plant maturity and local weather rather than the calendar alone. Inspect flower development closely and choose a dry harvest window where possible. Indoor crops are typically ready after the stated 8–9‑week flowering period, although individual plants may finish slightly earlier or later.