Granddaddy Purple Auto Seeds

Kiwi Seed Bank presents Granddaddy Purple Auto, a compact autoflower that combines Granddaddy Purple genetics with ruderalis. Its manageable size, straightforward life cycle and broad climate suitability make it an approachable option for newer growers, while its rich colour potential and layered fruit-and-spice profile offer plenty of character.

Genetics & effects

This cultivar is approximately 80% indica and 20% sativa. Plants generally stay between 50–100 cm, making them useful where vertical space is limited. The stated cannabinoid range is 15–22% THC and 0–1% CBD, although final levels can vary with environment and plant care.

Individual experiences differ, but users commonly describe the effects as relaxed, calming and euphoric, sometimes with an uplifting opening that develops into a sleepier, heavier finish. The aromatic profile may bring together sweet berry, cherry and general fruity notes with touches of pepper and pine. Myrcene, caryophyllene, pinene and linalool are among the associated terpenes.

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

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

Growing in New Zealand

As an autoflower, Granddaddy Purple Auto begins flowering according to age rather than a changing light schedule. In New Zealand, outdoor spring planting generally falls between September and November. Choose the warmest, brightest part of the available season and avoid unnecessary transplant stress by starting in the final container where practical.

It can suit hot, dry or temperate settings as well as cooler regions with short summers. In humid locations, steady airflow and shelter from prolonged rain can reduce the risk of mould around dense flowers. Always consider your local conditions and applicable rules before growing.

Indoor

Indoors, the compact 50–100 cm structure is easy to accommodate in smaller tents and rooms. A consistent light cycle, stable airflow and moderate feeding are usually preferable to frequent changes. Autoflowers have limited recovery time, so gentle training and early canopy organisation are better suited than aggressive pruning late in growth.

Indoor yields are listed at up to 300 g/m². This is a reference figure rather than a fixed outcome, as lighting, container size, nutrition, temperature and grower experience all influence the final harvest.

Outdoor

Outdoors, select a position with long hours of direct sun, good drainage and some protection from strong wind. Plants remain relatively discreet at 50–100 cm and may suit containers, patios or compact garden spaces. Keep foliage dry where possible, maintain space around each plant and inspect flowers regularly during wet autumn weather.

Outdoor yields are listed at up to 80 g per plant. Results vary according to planting date, sunlight, root space and seasonal conditions.

Harvest

The listed flowering period is approximately 8–9 weeks. In New Zealand’s seasonal framework, the main outdoor harvest window is March to May, though autoflower timing depends strongly on the sowing date. Check flower maturity rather than relying only on the calendar, and harvest before extended cold or wet conditions affect quality. Careful drying in a dark, ventilated space helps retain the cultivar’s favourite sweet-fruit aromas and purple colour.