Granddaddy Purple Seeds

Granddaddy Purple is a feminised, photoperiod selection combining Purple Urkle and Big Bud genetics. This indica-dominant hybrid is known for compact growth, generous branching and dark colour that can become more pronounced in cooler late-flowering conditions. Its sweet berry and grape profile is layered with earthy, fruity, pine and herbal notes.

Genetics & effects

With an estimated 70% indica and 30% sativa profile, Granddaddy Purple generally develops broad leaves, sturdy lateral growth and dense flower clusters. THC is listed at 17–23%, while CBD is listed at 0–0.4%. Myrcene, beta-caryophyllene and pinene contribute to its sweet, earthy and lightly resinous aromatic character.

Individual experiences vary, but its effects are often described as relaxed, calming and euphoric, with a happy initial mood that may become sleepy over time. Some people also report feeling hungry. Aroma, potency and personal experience can differ according to phenotype, environment and cultivation choices.

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

This is an intermediate-level cultivar suited to hot, dry and temperate Australian conditions. Outdoor spring planting generally falls between September and November, once local frost risk has passed and daylight hours are increasing. Choose a sunny position with airflow, well-draining growing media and enough space for lateral branches.

Humidity management is particularly important because the flowers can become compact. Good spacing, selective pruning and protection from prolonged rain may reduce the risk of mould. In warmer regions, afternoon shade can help limit heat stress, while temperate growers may benefit from a sheltered site with strong sun exposure.

Indoor

Indoors, plants may reach up to 100 cm and usually flower for around 9–10 weeks after the light cycle changes. A broad, even canopy can help make use of the plant’s branching structure. Gentle training during vegetative growth and selective removal of crowded inner growth can improve light distribution and airflow.

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

Outdoor

Outdoor plants may grow up to 180 cm where root space, sunlight and seasonal conditions are favourable. Yields are listed at up to 600 g per plant. Support may be useful as flowers gain weight, especially on exposed sites. Monitor late-season humidity and rainfall, and keep the canopy open enough for air to move between branches.

Harvest

Australian outdoor harvest commonly falls between March and May. Flower maturity can be assessed by observing trichome development, pistil colour and overall flower density rather than relying only on a calendar date. At maturity, expect resinous flowers with deep green to purple tones and a layered aroma led by grape, berry and sweet earth. Careful drying in a dark, ventilated space helps preserve the cultivar’s distinctive fragrance and colour.

Granddaddy Purple is presented in the Outback Seed Bank catalogue as feminised seed. Published dimensions, timing and yields are approximate and can vary between plants and environments.