Granddaddy Purple Strain Feminized SeedsKen Estes's Bay Area purple indica as feminized photoperiod seeds
5.00 out of 5 · 4 reviewsThe Granddaddy Purple strain is the grape-scented California indica that Ken Estes made famous around 2003, sold here as feminized photoperiod seeds that grow only female plants. GDP keeps growing leaves until its nights reach 12 hours, then flowers for about 8 to 10 weeks indoors and finishes outdoors in October. Expect stocky, productive plants, dense buds that often turn violet, and a reported 20–27% THC.
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What is the Granddaddy Purple strain?
Granddaddy Purple (GDP) is an indica-dominant hybrid, about 70% indica, that Ken Estes introduced in Oakland around 2003 and that most breeders list as Purple Urkle × Big Bud. This feminized photoperiod version grows only female plants and starts to bloom once you give it 12 hours of darkness a night. Seed lines quote 8 to 10 weeks of flowering, 400–600 g/m² indoors and an October outdoor finish, while AllBud lists 20–27% THC with grape, berry and earthy flavors.
Ratio from AllBud and Barneys Farm's Granddaddy Purple listing; other seed lines simply call it mostly indica.
Granddaddy Purple's violet buds and leaves show most strongly when night temperatures drop in the last weeks of bloom, and lavender phenotypes are common.
Granddaddy Purple strain specs
The Granddaddy Purple figures below are reported ranges from feminized seed lines (Barneys Farm and ILGM on SeedFinder, plus MSNL) checked against AllBud and Leafly. The sellers' flowering times differ by a few weeks, so the table gives the spread instead of a single number.
| Type | Indica-dominant hybrid, about 70% indica / 30% sativa |
|---|---|
| Genetics | Purple Urkle × Big Bud (the pedigree most breeders and databases use) |
| Bred by | Ken Estes, California; launched in Oakland around 2003. Feminized seeds come from several seed banks |
| THC | 20–27% on AllBud; feminized seed lines list about 15–25% |
| CBD | Low, around 1% or less |
| Main terpenes | Myrcene, pinene, caryophyllene |
| Aroma & flavor | Grape, mixed berry, violet, sweet earth, a sharp and pungent finish |
| Reported effects | Relaxed, euphoric, happy, hungry, sleepy |
| Seed type | Feminized photoperiod (female plants; blooms on a 12/12 light schedule) |
|---|---|
| Flowering indoors | 8–10 weeks on most listings (55–70 days); ILGM gives about 77 days |
| Outdoor harvest | October in the Northern Hemisphere, early to late depending on latitude and seed line |
| Height | About 60–100 cm (2–3.3 ft) indoors; 1.2–1.8 m (4–6 ft) outdoors |
| Yield | 400–600 g/m² (1.3–2 oz/ft²) indoors; Barneys Farm gives 400–1,000 g (14–35 oz) per plant outdoors |
| Difficulty | Easy to moderate |
| Best methods | Topping, SCROG, Sea of Green with a short veg |
| Climate | Indoors, or temperate gardens with a mild, dry autumn |
Where does the Granddaddy Purple strain come from?
Granddaddy Purple was introduced by Ken Estes, a California grower who launched it in Oakland around 2003, and AllBud, Barneys Farm, ILGM and MSNL all list it as Purple Urkle × Big Bud. Purple Urkle is credited with the violet color and the grape-candy smell, while Big Bud, a famously heavy-yielding indica, gave GDP its chunky colas and strong harvests.
Estes himself has told a less tidy story. As PAX recounts it, his first purple plant came from Native American growers in Northern California and was a daughter of a Skunk #1 backcross. The Purple Urkle × Big Bud pedigree is the one breeders work from today, but the two accounts show how loosely early California strains were recorded. The feminized seeds on sale now are seed-bank lines bred from GDP so that every seed grows a female plant.
How is feminized Granddaddy Purple different from GDP Auto?
Feminized Granddaddy Purple is a photoperiod plant, so you decide when it flowers by cutting the light to 12 hours a day, while GDP Auto blooms by itself after a few weeks. That control lets you veg the feminized plant for as long as your space allows, keep a mother and take cuttings, and grow the larger plants behind the 400–600 g/m² indoor figures. The cost is time: a feminized GDP run usually takes 3 to 4 months from seed, compared with roughly 2 to 2.5 months for the autoflower.
Clones stay true. Cuttings from a feminized GDP mother keep growing vegetatively until you change the light, so one standout purple plant can supply matching plants for later runs.
What does Granddaddy Purple taste like, and how does it feel?
Aroma and flavor
Granddaddy Purple smells of crushed grapes and ripe berries over sweet, damp earth, and the smoke carries a floral, violet-like note. AllBud warns that the exhale can turn harsh and pungent, which some smokers enjoy and others find overpowering.
- Grape
- Berry
- Violet
- Sweet earth
- Pine
- Pungent
Terpenes
- Myrcene
- Musky, fruity base; Phat Panda calls it GDP's most prominent terpene
- Pinene
- Sharp pine with a slightly woody edge
- Caryophyllene
- Peppery, spicy warmth
- Linalool
- Light floral accent that appears in some GDP profiles
Leafly, ILGM and MSNL all name myrcene, pinene and caryophyllene as Granddaddy Purple's main terpenes; linalool shows up in some lab-based profiles.
Reported effects
People who try Granddaddy Purple most often describe a slow wave of body relaxation, a happy, dreamy mood and a big appetite, with heavy couch-lock if they keep going. Barneys Farm and AllBud both point to evening use, and many users say a larger dose ends in sleep.
- Relaxed
- Euphoric
- Happy
- Hungry
- Sleepy
Granddaddy Purple's reported downsides include dry mouth, dry eyes and dizziness at higher doses, and a few AllBud reviewers mention feeling anxious.
These Granddaddy Purple effects summarize AllBud and Leafly user reports and the descriptions from Barneys Farm and ILGM. Reactions differ from person to person, and nothing here is medical advice.
How do you grow Granddaddy Purple seeds?
Feminized Granddaddy Purple seeds are forgiving for most growers: veg the plants under 18/6 until they fill about half the space, change the timer to 12/12 to start bloom, support the heavy colas, and keep humidity low for the 8 to 10 weeks the dense buds need to ripen.
- Germinate3–7 days
GDP seeds usually crack within a few days in a damp paper towel or a small pot of light mix; give seedlings gentle light once the first true leaves open.
- Vegetate4–6 weeks indoors
Feminized GDP stays in leafy growth for as long as the lights run 18 hours a day. Top it once around the fifth node so the main cola splits into several.
- Flower8–10 weeks
After the move to 12/12, Granddaddy Purple stretches moderately, then packs on fat, tight buds. Cooler nights in the final two weeks bring out more purple.
- HarvestDay 55–70 indoors · October outdoors
Pick when most trichomes look milky with some amber for GDP's full body effect, then dry the buds slowly in a cool, dark room.
Grow tips for Granddaddy Purple
- Prop up the colas. Big Bud genetics give Granddaddy Purple heavy, dense buds that can bend branches late in bloom, so add stakes, a trellis net or yo-yos before week five of flowering.
- Watch for bud rot. GDP's tight flowers hold moisture. Keep relative humidity near 40–45% in late bloom and run fans under the canopy, especially outdoors in a wet October.
- Use night temperatures for color. A night drop of about 5–8 °C (9–14 °F) in the last weeks helps Granddaddy Purple show its purple; color says nothing about ripeness or strength, so judge harvest by the trichomes.
- Keep a mother plant. Because these seeds are photoperiod, many growers pick their best grape-scented GDP, keep it under 18/6 and take cuttings for every run after that.
- Plan for the smell. AllBud describes Granddaddy Purple's aroma as powerful, and it peaks in the second half of bloom, so run a carbon filter indoors.
- Outdoors, pick a mild autumn. Outdoor GDP finishes between early and late October depending on the seed line, so it does best where autumn stays mild and dry into the harvest.
Is Granddaddy Purple the right strain for you?
Great pick if you
- Want a classic purple indica with grape and berry flavor
- Like to veg, top and fill a tent for a bigger harvest
- Want to keep a mother plant and take clones
- Prefer a heavy, relaxing strain for the evening
Think twice if you
- Want an energetic daytime high
- Need the quickest possible grow (GDP Auto finishes sooner)
- Grow outdoors where October turns cold and wet
- Can't control a strong smell in late bloom
Granddaddy Purple strain FAQ
Is Granddaddy Purple indica or sativa?
Granddaddy Purple is an indica-dominant hybrid. AllBud and Barneys Farm list it at about 70% indica and 30% sativa, and its reported effects are mostly physical and calming, which is why many people keep GDP for the evening.
Is it spelled Granddaddy Purple or Grandaddy Purple?
Both spellings name the same strain. Granddaddy Purple, with a double d, is the spelling most strain databases use, while Grandaddy Purple and the short form GDP appear on many seed and dispensary menus.
What are the parents of Granddaddy Purple?
Most breeders and databases, including AllBud and Barneys Farm, list Granddaddy Purple as Purple Urkle × Big Bud. Ken Estes, who introduced it, has described his original purple plant as a Skunk #1 backcross from Northern California, so the pedigree isn't fully settled.
How long does feminized Granddaddy Purple take to flower?
Most feminized Granddaddy Purple lines flower in about 8 to 10 weeks once the light schedule goes to 12/12; Barneys Farm gives 55–65 days. ILGM lists about 77 days, so allow up to 11 weeks for slower plants. Outdoors it finishes in October.
How much THC does Granddaddy Purple have?
AllBud lists Granddaddy Purple at 20–27% THC with about 1% CBD. Feminized seed lines quote slightly lower figures, from roughly 15–25% (Barneys Farm) to 23% (ILGM). Real potency depends on the plant, the light and when you harvest.
How much does Granddaddy Purple yield?
Feminized Granddaddy Purple is listed at about 400–600 g/m² (1.3–2 oz/ft²) indoors, and Barneys Farm gives up to 1,000 g (35 oz) per plant outdoors in good conditions. The Big Bud side of its family is the main reason GDP produces so well.
How tall does Granddaddy Purple get?
Granddaddy Purple stays fairly compact for a photoperiod plant. Indoor plants usually finish around 60–100 cm (2–3.3 ft), and outdoor plants reach about 1.2–1.8 m (4–6 ft), so GDP fits a standard tent or a backyard bed.
Why are Granddaddy Purple buds purple?
Granddaddy Purple's color comes from anthocyanin pigments inherited from its Purple Urkle side. Cooler night temperatures late in flowering tend to deepen the purple, but the shade varies from plant to plant and has no link to potency.
Should I grow feminized or autoflower Granddaddy Purple?
Pick feminized Granddaddy Purple if you want bigger plants, higher yields, clones and full control over when flowering starts. Pick GDP Auto if you would rather have a small plant that finishes in about 2 to 2.5 months without any change to the light schedule.
Granddaddy Purple reviews
5.00 out of 5 from 4 reviews
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4 reviews for Granddaddy Purple Strain Feminized Marijuana Seeds
Granddaddy Purple's family and similar purple strains
Purple Urkle Feminized
Big Bud Feminized
Grandaddy Purple Autoflowering Feminized
God’s Gift FeminizedBeaver Seeds sells cannabis seeds for collection and genetic preservation where permitted. Check the laws in your state, province or country before germinating seeds. Effects are user-reported and are not medical claims.
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Wayne Mazello –
After hours, the strong buzz still vibrates through my body, leaving me feeling calm and at ease. The simplest plant in history to cultivate! I started getting excellent nighttime sleep the day I started using it. She also yields a lot, and her buds are really beautiful and taste like berries and citrus. The best strain all in all! So awesome!
Ken –
The easiest plant to grow ever! I cant think of one negative thing to say about this strain. From seed to harvest in about 80 days! The perfect high and smokes beautifully.
Arturo Crane –
Such manly effects! I feel the potent buzz shaking my body, and after hours, I feel very relaxed and soothed. I can still taste the citrus and mint that remains in my mouth. Grapes and mixed berries also linger in the air for a while—also, a very high-yielding and easy-to-grow plant. Best strain so far!
John Maples –
I have always stocked Grandaddy Purp, because of its relaxing and sedating it helped me a lot with my insomnia. The day I started using it; is the day I also began to have a great sleep at night. It was an easy strain to grow and she’s also high yielding, and damn her buds look awesome and taste like sweet, citrus and berries. Really a great strain to those who suffer from insomnia.