Critical Jack Auto Seeds

Genetics & effects

Critical Jack Auto is a feminised autoflower combining Jack Herer, Critical and ruderalis genetics. Its 60% sativa and 40% indica profile brings together energetic heritage, compact structure and a growth cycle that does not rely on changing daylight hours to begin flowering. Listed THC levels are 12–15%, while CBD is listed at 0.1–0.2%.

The aromatic profile may suggest pine, lemon, spice, floral sweetness and a light pepper edge, reflecting limonene, pinene and caryophyllene. Individual experiences vary, but some consumers describe the effects as euphoric and creative at first, followed by a relaxed, physically calming feel. Setting, personal tolerance and flower characteristics can all shape the subjective experience.

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

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

Growing in Australia

This beginner-friendly variety can suit hot, dry areas, temperate regions and cooler locations with short summers. As an autoflower, it can move into bloom according to age rather than seasonal light changes. Even so, strong sunlight, stable conditions and suitable timing remain valuable. In Australia, the main spring planting window runs from September to November, with local temperatures and daylight influencing the best start date.

Use a light, free-draining growing medium and avoid keeping the root zone constantly wet. Autoflowers generally have limited time to recover from major stress, so steady care and gentle plant shaping are preferable. Explore more autoflower seeds or browse the feminised seed collection.

Indoor

Indoors, Critical Jack Auto is listed at approximately 80–140 cm. Its manageable height can work in smaller rooms or tents, although airflow and adequate spacing remain important as flowering progresses. A consistent light schedule, moderate feeding and careful watering can support balanced development.

Indoor yields are listed at up to 350 g/m² under favourable conditions. Actual output varies with lighting, environment, container size and grower experience. Maintain air movement through the canopy and monitor humidity around developing flowers to reduce mould risk.

Outdoor

Outdoor plants may reach up to 150 cm and are listed to produce up to 450 g per plant in favourable conditions. Choose a sunny position with drainage and some shelter from damaging winds. In hot, dry districts, check moisture regularly without saturating the soil. In temperate or cool, short-season areas, an earlier spring start may provide more useful warmth before autumn conditions arrive.

Regular observation is especially helpful after rain or during humid spells. Remove damaged plant material, allow space between branches and keep the surrounding area tidy to support airflow.

Harvest

The listed flowering period is approximately 8–9 weeks, though the full cycle and finishing date depend on conditions and plant development. Australian outdoor harvests commonly fall between March and May, while autoflowers started at different times may finish outside that window.

Assess maturity by observing flower development and trichome colour rather than relying only on the calendar. Harvest timing can influence aroma, flavour and the character of the final experience. Listed heights, flowering times and yields are guides rather than assured outcomes.