Grand Daddy Purple Feminized Seeds

Grand Daddy Purple is an indica-dominant feminized strain, 75% indica and 25% sativa, known for purple buds and a grape-forward flavour. Better known as Granddaddy Purple, or GDP, it won a 2015 High Times Cup, and it is an easy grow that flowers in about 8 to 10 weeks. These seeds are Royal Queen Seeds’ version of the strain, listed at up to 20% THC.

History & lineage

Ken Estes is the man behind the name. In a Leafly interview he says he was shown cannabis called Purple Medicine and gave it the name Granddaddy Purple. He launched it in Oakland, on Telegraph Avenue, in 2003, and within a month, he says, there were lines around the corner. A Granddaddy Purple entered by Herbal Healing, listed as Granddaddy Purps, went on to win Best US Indica Flower at the 2015 High Times US Cannabis Cup in Denver.

Its parentage is disputed, since Estes names no parents. Royal Queen Seeds lists these seeds as Purple Urkle × Big Bud: Purple Urkle is believed to come from a phenotype of Mendocino Purps, and Big Bud from an Afghan and a Skunk plant. Leafly gives GDP as a cross of Mendo Purps, Skunk and Afghanistan. GDP has gone on to parent other strains, among them Grand Daddy Black.

Aroma & flavour

For Grand Daddy Purple, Leafly users most often describe the flavour as grape, berry and sweet, followed by earthy and pungent. Royal Queen Seeds lists blueberry, candy and fruity notes for its seeds, with a dash of pine. Leafly’s lab data lists myrcene as its most abundant terpene, followed by pinene and caryophyllene. Royal Queen Seeds notes purple hues on the flowers, and Leafly describes buds that bloom in shades of deep purple under a snow-like dusting of white crystal resin.

Effects, as users report them

Those are Leafly users’ reports for Grand Daddy Purple as a strain, most common first. Dry mouth and dry eyes are the downsides people mention most, and smaller numbers report dizziness, paranoia, headaches or anxiety, especially newer users. Royal Queen Seeds describes a deeply relaxing physical stone that also lifts the mood, and lists THC at up to 20%. Effects vary with the person and the dose, so start low if you are new to cannabis.

Growing Grand Daddy Purple

This is a feminized photoperiod plant: it keeps growing leaves until the light drops to 12 hours a day indoors, or until the days shorten outdoors. Royal Queen Seeds gives about 8 to 10 weeks of flowering indoors and an early-October harvest outdoors in the Northern Hemisphere, and lists it for short summers.

Royal Queen Seeds calls GDP relatively easy to grow, with sturdy, low-maintenance plants, and Leafly’s grow information rates it easy as well. Its data sheet puts plants at 70–120 cm (2.3–3.9 ft) indoors and 120–150 cm (3.9–4.9 ft) outdoors, with 450–500 g/m² (1.5–1.6 oz/ft²) indoors and 550–600 g (19.4–21.2 oz) per plant outdoors. Leafly’s grow notes suggest excellent air circulation, 21 to 27 °C (70 to 80 °F) and about 50% humidity. A cooler finish can deepen purple tones; our guide to purple cannabis strains explains why. Support the heavier branches late in flower, and judge when to harvest by the trichomes.

Is Grand Daddy Purple right for you?

Questions buyers ask