Indica Dominant Hybrid
Granddaddy Purple
Also known as: GDP, Grand Daddy Purp, Granddaddy Purple Kush, Grandaddy Purp
THC17% - 23%
CBD0% - 1%
Flowering9-10 weeks
Top terpenes: Myrcene, Pinene, Caryophyllene
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Quick answer
Granddaddy Purple (GDP) is California's famous indica, a Mendo Purps, Skunk and Afghanistan cross (also described as Big Bud x Purple Urkle). Around 17-23% THC with grape and berry aromas, it fuses cerebral euphoria with heavy physical relaxation - the go-to for pain, stress and insomnia. Strictly an evening strain.
GDP is the reason 'purple' became a whole category, and most purple flower since has been a tribute act. Grape candy on the nose, sure - but the real tell is the weight. Twenty minutes in, your legs file for early retirement. This is a 9pm strain, full stop. Insomnia and pain folks have kept it in the top ten for two decades and they're not wrong. The only downside is tomorrow morning's fog if you overdo it. Beginners: one puff. Veterans: you already know.
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Strain facts
| Type | Indica Dominant Hybrid |
|---|
| Terpenes | Myrcene, Pinene, Caryophyllene |
|---|
| Flavours | Berry, Grape, Sweet |
|---|
| Flowering | 9-10 weeks |
|---|
The story of Granddaddy Purple
Granddaddy Purple was popularized in 2003 by Ken Estes of the Grand Daddy Purp Collective in the Bay Area, and it went on to define what most people picture when they hear "purple weed": dense, resin-heavy buds flushed deep violet with bright orange pistils. The lineage is debated among old-timers. Most sources credit a Purple Urkle x Big Bud cross, which explains the grape-berry sweetness and the oversized yields, while Estes himself has described the genetic base as Mendo Purps, Skunk and Afghan. Either way, the result was a strain so distinctive it became the template for the entire purple indica category that followed.
Its influence shows up everywhere in modern cannabis. Purple Punch, Cherry Pie and Grape Ape all trace back to GDP genetics, and any dispensary menu with a "purple" section is arguably selling its grandchildren. Few strains from the early-2000s medical era have stayed this relevant this long.
Terpene breakdown
GDP's signature effect profile comes from a myrcene-led terpene stack. Well-grown samples typically show:
- Myrcene (0.5 to 1.4 percent): the sedative driver - earthy, musky, and the reason GDP hits like a sleeping pill at higher doses.
- Caryophyllene (0.2 to 0.5 percent): peppery and warming, adds the spice that keeps the grape sweetness from being cloying.
- Pinene: a sharp pine lift that keeps the head high dreamy rather than foggy.
Values vary by grow and cure, but the ratio matters more than the numbers: high myrcene with pinene support is what makes GDP feel calming rather than stupefying.
Growing Granddaddy Purple
GDP flowers in 9 to 10 weeks indoors and carries the Big Bud side of its family proudly: large, dense colas and generous yields for an indica. The purple colouring deepens with cooler late-flower temperatures, though it expresses even without temperature manipulation. It stays short and bushy, suits indoor tent growing, and the density of the buds means growers should watch humidity in late flower to avoid mould. A forgiving plant overall - one reason it spread through so many Canadian gardens.
How to consume Granddaddy Purple
Joint or bowl is the classic route and the easiest to dose: one or two puffs, wait fifteen minutes, decide from there. Vaping at lower temperatures brings out the grape sweetness; higher temps push the earthy, fuller flavour. Edible conversions are where GDP catches people out - its sedation builds late, so dose lower than you think and stay put. Keep water nearby, clear your evening, and do not plan to drive.
GDP compared to similar strains
If you like GDP's grape-and-calm profile, Purple Punch is its direct descendant - sweeter, slightly more giggly, with a similar evening lean. Grape Ape pushes the grape flavour harder with a comparable body heavy. For a more cerebral, citrus-leaning take on the same relaxing base, Cherry Pie is its durban-influenced relative - GDP fans often cross-shop all three.
Frequently asked questions
What is Granddaddy Purple?
Granddaddy Purple (GDP) is a legendary indica created by Ken Estes in 2003 from Purple Urkle and Big Bud genetics. It tests 17-23% THC and is one of the most recognizable purple strains in the world.
What does Granddaddy Purple taste like?
Sweet grape and berry with spicy, earthy undertones. The grape note is unmistakable.
What are Granddaddy Purple's effects?
Deeply relaxing and sleepy, with a dreamy, introspective head high. Expect strong body heaviness and the munchies. Best for nights in.
Is Granddaddy Purple an indica or sativa?
A true indica-dominant classic - one of the strains that defined the category. Daytime use will likely end in a nap.
Where can I buy Granddaddy Purple in Canada?
Check the in-stock list above for live Granddaddy Purple pricing at BMWO, shipped Canada-wide.