Quick answer
Granddaddy Purple is an indica-dominant hybrid. Ken Estes bred it in 2003 in California. The reported cross is Purple Urkle and Big Bud. Lab tests put THC at 17% to 23%. Myrcene is the top terpene, and the smell runs to grape, berry, and damp earth. Flowering takes 8 to 11 weeks indoors. In legal US markets, most buyers now meet the strain as a pre-roll, a vape cartridge, or a delivery order. Convenience decides the sale more often than the flower does.
Granddaddy Purple Flowering Time Indoors: What to Check Before You Buy
Lineage and naming
Estes sold clones in the San Francisco Bay Area under the Granddaddy Purple name. Growers also write it Grand Daddy Purple, Granddaddy Purp, or GDP. Two cuts circulate. One leans purple with a compact bud structure. The other finishes greener and yields more. Dispensary menus do not label which cut they carry, so two jars with the same name can differ.
Numbers on a test label
- THC: 17% to 23% in tested flower. Some lots report 25% or more.
- CBD: below 1% in most samples.
- Terpenes: myrcene first, then pinene and caryophyllene.
- Flowering time: 8 to 11 weeks indoors.
- Yield: moderate. The purple cut yields less than the Big Bud parentage suggests.
Where the purple comes from
Anthocyanins cause the color. These pigments build when night temperatures drop into the 50s Fahrenheit during the last two to three weeks of flower. A warm room produces green buds from the same clone. Purple color is not a potency marker. It is a temperature and genetics marker.
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Effects and dose
Users report body heaviness, calm, and appetite increase. The strain sees heavy use in the evening. New users should start at 5 mg of THC or less. Dry mouth and dry eyes are the two reports that come up most. High doses bring couch lock and short-term memory fog.
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Why convenience decides the purchase
Granddaddy Purple takes 8 to 11 weeks to finish and yields a moderate crop. Pre-roll packs and vape cartridges cut the steps between purchase and use. A 1-gram pre-roll needs no grinder, no tray, and no cleanup. A 0.5-gram cartridge holds roughly 300 to 400 pulls. Delivery removes one more step. Stores in delivery states report order sizes of 1 to 3 items, which favors single-serve formats over eighths. The strain fits that shift because the aroma survives processing in carts and the effects suit a 2 to 3 hour window.
How to read a label before buying
- Check total THC, not delta-9 THC alone. Total adds THCA after decarboxylation.
- Check the package or harvest date. Terpenes fade over 6 to 12 months.
- Check the terpene panel for the myrcene percentage.
- Check the net weight. Paper and filter add 0.1 to 0.2 grams to a pre-roll.
What is not settled
No lab standard separates the two circulating cuts. THC ceilings vary by grow, light, and cure. Seed sellers list different parentage, and some sell unverified copies. Buyers who want a known cut should ask for the grower name and the harvest date.