Grandmommy Purple Seeds

Genetics & effects

Grandmommy Purple is a feminised, indica-dominant hybrid created from Big Bud × Purple Urkle. Its profile is listed as approximately 80% indica and 20% sativa, with catalogue specifications indicating 27–33% THC and 0–1% CBD. These figures are useful reference points, although expression can vary with phenotype, environment and cultivation.

Grape, berry and sweet flavours lead the profile, followed by earthy and woody undertones. Myrcene, caryophyllene and pinene are the prominent listed terpenes. Some adults describe the experience as powerful, calming and deeply relaxed, often with happy, sleepy or hungry feelings. Effects are subjective and may differ considerably between individuals.

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

Grandmommy Purple is considered an intermediate-level option suited to hot, dry and temperate Australian conditions. Its dense, indica-style flowers benefit from steady airflow and careful humidity management, particularly late in bloom. Spring planting generally falls between September and November in the southern hemisphere, once local temperatures are reliably suitable.

Good sun exposure, free-draining soil and consistent irrigation support balanced development. Avoid persistently wet roots and abrupt swings between saturation and drought. As flowering progresses, inspect dense flower sites regularly and maintain spacing between branches to reduce the risk of mould.

Indoor

Indoors, plants may reach up to 120 cm, making Grandmommy Purple manageable in rooms with moderate headspace. A flowering period of around 9–10 weeks is typical. Gentle branch training and an even canopy can help light reach more flowering sites, while selective removal of crowded interior growth can improve airflow.

Under favourable conditions, catalogue figures suggest indoor yields of up to 600 g/m². Actual performance depends on phenotype, lighting, root space, nutrition, climate control and grower experience. Watch humidity as flowers gain weight, and provide support if branches begin to lean.

Outdoor

Outdoor plants may grow to up to 180 cm and can develop broad, productive branching where space and sunlight are plentiful. The listed outdoor potential is up to 1,000 g per plant in favourable conditions, but results naturally vary. A sheltered position with strong direct light and airflow is preferable.

In humid or changeable districts, allow generous spacing and consider rain protection during the final weeks. Purple colour may become more visible in some phenotypes as nights cool, though expression is influenced by genetics and environment rather than assured.

Harvest

Australian outdoor harvest commonly falls from March to May, depending on latitude, planting date, phenotype and seasonal weather. Use flower maturity rather than the calendar alone when choosing the harvest window. Indoors, count the estimated 9–10 flowering weeks from the established bloom phase.

At harvest, handle aromatic flowers carefully and dry them in a dark, ventilated area with stable conditions. Gradual drying helps retain the grape, berry, sweet and earthy character that may make this cultivar a favourite among growers seeking bold purple genetics. Grandmommy Purple is presented in the Outback Seed Bank catalogue as feminised seed.