One sec…
One sec…
Sweet, heavy purple indica. The classic 'goodnight' strain.
Granddaddy Purple is in stock at this store today.
Live stock updates every few minutes. Call ahead if you want a budtender to set one aside.
Granddaddy Purple — almost always shortened to GDP on the floor — is the cut that hardwired the image of 'purple weed' into a whole generation of customers. Ken Estes built it in San Francisco's Bay Area in 2003, crossing the deep-purple Purple Urkle with the dense-yielding Big Bud to lock in both the grape-skin pigmentation and the swollen calyxes the strain became famous for. GDP set the template every purple strain since (Purple Punch, Grape Ape, Grandaddy Purp phenotypes, all the 'Purple OG' crosses) gets compared against. On our shelf it's the name customers ask for when they want the original — heavy body, grape-and-berry sweetness on the nose, the slow-build evening arc that lands somewhere between a deep exhale and the second half of a movie. The intoxicating-effect warning matters here more than most: GDP runs heavier than its modest THC range suggests, and the couch-bound landing is what regulars rotate it in for.
Live inventory
6 Granddaddy Purple-related products available at Seattle Cannabis Co. right now.






Genetics
Granddaddy Purple's parents, descendants, and sister strains in the catalog.
Aromatic chemistry
It's the Purple Urkle parent talking. Urkle carries the anthocyanin pigments that turn the leaves and calyxes purple in cool overnight temperatures during late flower. Big Bud doesn't carry the pigment but contributes the dense, swollen flower structure. GDP gets both, which is why a well-grown batch looks almost black-purple in low light and lighter grape-purple in sun.
Same family, different angles. Purple Punch leans cleaner and sweeter — more fruit-punch candy, less grape-skin. Grape Ape is closer to GDP on the aroma side but reads denser and heavier on the back end. GDP sits in the middle: sweeter than Grape Ape, deeper than Purple Punch, and the one customers compare the others against. If you've only had one purple strain, it was probably GDP.
Three layers stacked tight. Top is concord-grape skin — the sweet candy-purple smell, almost grape-soda. Middle is dark berry and a faintly herbaceous floral note, like a crushed violet. Base is sweet earth and damp loam, the myrcene reading through. Walks across a room but doesn't shout — quieter aroma than a Kush or a diesel strain.
Closer than most. On the inhale, grape skin comes through right away — the same nose-fruit you got from the jar, lighter and a touch ashier from combustion. On the exhale, berry and a sweet damp-earth finish land, with a peppery warmth that lingers on the back of the throat. The grape stays through the whole hit, which is rare; most fruit-named strains lose the fruit on combustion.
Indica — and one of the heaviest body-leaning indicas in regular rotation. The lineage is Purple Urkle × Big Bud, two indica parents. Don't expect any sativa head-up character; GDP is the strain customers reach for when they want the body-loose evening arc, not the morning energy.
GDP lands in the 17–23% THC band — moderate by current shelf standards, but the body-weight reads way heavier than the number on the label. Anyone newer to indica-heavy flower should treat a quarter-gram as a full session and check in with themselves before lighting more. Experienced smokers handle GDP without surprise, but the couch landing builds slowly and can outpace you if you keep going through the first half hour expecting the hit to ramp.
Evening, no question. Customers commonly reach for it after dinner — when the day's tasks are done and the next thing on the schedule is a couch and a screen. Bad pick before a workday, before driving, before anything you need to stay sharp for. Plan accordingly.
Three reasons. The myrcene-dominant terpene profile is the biggest — myrcene tracks to what regulars call 'body weight' across almost every strain it leads on. The Purple Urkle lineage carries the same heavy character GDP inherits. And the indica-on-indica cross means there's no head-up sativa lift to balance the body-loose. The number tells you the cannabinoid load; the terpenes tell you how it'll feel.
Verified May 15, 2026 against 2 sources.
21+. Cannabis affects people differently — your experience may vary. Not medical advice. Effects described are common customer reports, not promises. Seattle Cannabis Co., Seattle, WA.