Grandaddy Purple Strain Regular SeedsRegular GDP seeds for breeders, mother hunts and purple crosses
5.00 out of 5 · 3 reviewsThe Grandaddy Purple strain from regular seeds gives you the whole genetic deck of California's famous grape-scented indica: roughly half the plants grow female and half grow male. That makes these seeds the pick for growers who want to hunt for a keeper mother, make their own purple crosses or collect pollen. The females flower in about 8 to 11 weeks after the lights go to 12/12 and are reported at around 18–27% THC.
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What is the Grandaddy Purple strain?
Grandaddy Purple (often written Granddaddy Purple, or GDP) is an indica-dominant hybrid that Ken Estes made famous in the San Francisco Bay Area around 2003, and the regular-seed version is the one breeders reach for. Strain databases list it as Purple Urkle × Big Bud, about 70% indica. Regular GDP seeds grow both male and female plants: the females flower in roughly 8 to 11 weeks under 12/12, smell of grape and berry and often turn deep purple, while the males supply pollen for new crosses.
AllBud and a regular GDP seed listing both give 70% indica / 30% sativa; SeedFinder lists Ken Estes's own line simply as an indica.
SeedFinder records that Ken Estes's own Grand Daddy Purp line was only ever offered as regular seed, never in feminized form.
Grandaddy Purple strain specs
Grandaddy Purple's figures come from SeedFinder's entry for Ken Estes's Grand Daddy Purp, AllBud, Leafly and seed banks that list regular and photoperiod GDP. Male plants are removed or kept only for pollen, so the yield, THC and flavor rows describe the female plants.
| Type | Indica-dominant hybrid, about 70% indica / 30% sativa |
|---|---|
| Genetics | Purple Urkle × Big Bud (most databases); rival accounts exist |
| Bred by | Popularized by Ken Estes in California around 2003; regular GDP lines are also sold by other breeders |
| THC | About 18–27% (AllBud 20–27%, a regular-seed listing 18–23%) |
| CBD | Low, around 1% or less |
| Main terpenes | Myrcene, pinene, caryophyllene |
| Aroma & flavor | Grape, berry, sweet, earthy, with a musky, spicy edge |
| Reported effects | Relaxed, euphoric, happy, hungry, sleepy at higher doses |
| Seed type | Regular (male and female plants, roughly half each) |
|---|---|
| Flowering indoors | 8–11 weeks; SeedFinder lists about 77 days for Estes's line |
| Outdoor harvest | Late September to early October (Northern Hemisphere) |
| Height | Medium, about 1–1.8 m (3.3–6 ft), with bushy side branches |
| Yield | Moderate; seed banks quote 400–500 g/m² (1.3–1.6 oz/ft²) for females, while some growers of Estes's line report less |
| Difficulty | Easy to moderate; regular seeds add the sexing step |
| Best methods | Topping, LST and SCROG; cuttings from a chosen mother |
| Climate | Indoors, or warm outdoor gardens with a dry autumn; cool late-bloom nights deepen the purple |
Where does the Grandaddy Purple strain come from?
Grandaddy Purple is credited to Ken Estes, who brought it to prominence in the San Francisco Bay Area around 2003, and strain databases such as AllBud and SeedFinder record its parents as Purple Urkle and Big Bud. Purple Urkle is usually given credit for the color and grape scent, Big Bud for the chunky, dense flower clusters. Leafly also mentions a rival account naming Mendo Purps, Skunk and Afghan genetics, so read the pedigree as likely rather than proven.
SeedFinder's page for Estes's own Grand Daddy Purp line lists it as an indica with about 77 days of flowering that was never offered as feminized seed. Today several breeders sell regular GDP; a line from Grand Daddy Genetics, for example, is listed as Purple Urkle × Big Bud at 70% indica, 18–23% THC and 8–10 weeks of bloom. Because these are separate seed lines, plants from different sources can differ in color, timing and yield.
Why buy Grandaddy Purple as regular seeds?
Regular Grandaddy Purple seeds make sense when you want male plants, or a wide spread of females to choose from. A GDP male can carry the strain's purple color and grape aroma into your own crosses, and breeders have used GDP as a parent for years: Purple Punch, from Supernova Gardens, is Larry OG × Granddaddy Purple. Regular seed is also made the traditional way, by a true male pollinating a female, which many breeders prefer when building their own seed lines.
Plan for the males. Expect about half of a regular pack to be male. Keep only the ones you want for pollen, and grow them well away from flowering females so your bud plants stay seedless.
What does Grandaddy Purple taste like, and how does it feel?
Aroma and flavor
Grandaddy Purple smells and tastes like grape candy and mixed berries over an earthy base, with a musky, slightly spicy pungency that AllBud reviewers notice on the exhale.
- Grape
- Berry
- Sweet
- Earthy
- Musk
- Pine
Terpenes
- Myrcene
- Musky, earthy-fruity base; listed first by Leafly
- Pinene
- A fresh pine lift on the finish
- Caryophyllene
- Peppery spice behind the grape
Grandaddy Purple's terpene levels vary between seed lines, and between the female phenotypes in a single regular pack.
Reported effects
Users mostly describe Grandaddy Purple as a heavy, relaxing evening indica, starting with a happy, slightly dreamy head change and settling into a deep body calm that often brings the munchies and, at bigger doses, sleepiness.
- Relaxed
- Euphoric
- Happy
- Hungry
- Sleepy
Grandaddy Purple's reported downsides include dry mouth, a numbing heaviness that some people find too much, and anxious feelings in a few user reviews.
These Grandaddy Purple effects summarize user reports on AllBud, Leafly and SeedFinder, plus seed-bank descriptions. Everyone reacts differently, and nothing here is medical advice.
How do you grow Grandaddy Purple seeds?
Grandaddy Purple regular seeds grow like the familiar GDP plant with one extra job: veg the plants until they show their sex, remove or isolate the males, then flower the females for 8 to 11 weeks under 12/12 and keep late-bloom humidity low around the dense buds.
- GerminateAbout 1 week
Sprout more GDP seeds than the number of females you need, since roughly half of a regular pack will turn out male.
- Vegetate4–8 weeks indoors
Grandaddy Purple shows pre-flowers at the nodes after several weeks of growth. Look for small round pollen sacs (male) or a calyx with wispy white pistils (female) and label each plant.
- Flower8–11 weeks
After the switch to 12/12, flower only the females in your main space. Slightly cooler nights in the last weeks help bring out the purple.
- HarvestDay 56–77 · early Oct outdoors
Judge ripeness by the trichomes, since some GDP phenotypes need the long end of the window.
Grow tips for Grandaddy Purple
- Sex early and move males fast. One open Grandaddy Purple male can pollinate a whole tent. Pull males as soon as you see pollen sacs, unless you are keeping one for breeding in a separate room.
- Pick your keeper mother in veg. Regular GDP packs vary. Take a cutting from every female before you flip, then keep the clone of the plant with the deepest color, strongest grape smell and tightest buds.
- Collect pollen with care. If you keep a GDP male, flower it in its own space, shake the dry pollen onto clean paper and store it cool and dry until you make your cross.
- Open up the bushy canopy. Grandaddy Purple branches sideways and packs dense colas. Top it, spread the branches with LST or a SCROG net, and thin inner leaves for airflow.
- Color is not potency. The purple comes from anthocyanin pigments. A modest night-time temperature drop late in bloom can deepen it, but a darker plant is not a stronger one.
- Watch humidity at the end. Tight GDP buds hold moisture, so keep humidity down in the final weeks indoors and harvest outdoor plants before long autumn rains.
Is Grandaddy Purple the right strain for you?
Great pick if you
- Want GDP males or pollen for your own purple, grape-scented crosses
- Plan to grow out several females and keep the best as a mother plant
- Like heavy, relaxing evening indicas with a sweet grape taste
- Have room to veg extra plants until they show their sex
Think twice if you
- Want every seed to grow a bud-producing female (choose feminized GDP)
- Only have space for one or two plants
- Need a fast, automatic plant (an autoflower GDP finishes sooner)
- Prefer an energetic daytime high
Grandaddy Purple strain FAQ
Is Grandaddy Purple indica or sativa?
Grandaddy Purple is an indica-dominant hybrid. AllBud and a regular GDP seed listing both put it at about 70% indica and 30% sativa, and SeedFinder lists Ken Estes's original Grand Daddy Purp line simply as an indica.
How many Grandaddy Purple regular seeds will be female?
Expect roughly half of a pack of regular Grandaddy Purple seeds to grow female and half male, although any single pack can land above or below that split. Germinate a few more seeds than the number of flowering plants you want.
How do you tell male and female Grandaddy Purple plants apart?
Check the nodes where side branches meet the main stem after several weeks of vegetative growth. Male Grandaddy Purple plants form small round sacs that later open and release pollen, while females grow a teardrop-shaped calyx with fine white hairs called pistils.
Why grow Grandaddy Purple from regular seeds instead of feminized?
Regular Grandaddy Purple seeds give you male plants for breeding and a wider spread of female phenotypes to choose a mother plant from. Feminized GDP seeds suit growers who only want buds and would rather skip sexing.
Who created Grandaddy Purple?
Ken Estes is credited with popularizing Grandaddy Purple in California's Bay Area around 2003. Most strain databases list the cross as Purple Urkle × Big Bud, though Leafly notes a rival account that names Mendo Purps, Skunk and Afghan genetics.
How long does Grandaddy Purple take to flower?
Female Grandaddy Purple plants flower in about 8 to 11 weeks after the switch to 12/12. SeedFinder lists roughly 77 days for Ken Estes's line, while other regular GDP listings give 8 to 10 weeks. Outdoors it is usually ready from late September to early October.
How much THC does Grandaddy Purple have?
Grandaddy Purple is usually reported at about 18–27% THC with low CBD. AllBud lists 20–27% and one regular-seed listing gives 18–23%. Male plants don't produce smokable buds, so these figures describe the females.
Is it Grandaddy Purple, Granddaddy Purple or GDP?
All three names mean the same strain. Granddaddy Purple with a double d is the spelling most databases use, Ken Estes's own line appears as Grand Daddy Purp, and growers often shorten it to GDP.
Do Grandaddy Purple plants always turn purple?
Many Grandaddy Purple females turn deep purple late in flowering, but not every plant does. Color depends on each plant's genetics and on cooler night temperatures, and one SeedFinder grower reports the purple showing up around weeks 5 to 6 of bloom.
Grandaddy Purple reviews
5.00 out of 5 from 3 reviews
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3 reviews for Grandaddy Purple Strain Regular Marijuana Seeds
Grandaddy Purple's relatives and similar strains
Purple Urkle Feminized
Big Bud Feminized
Purple Punch Feminized
Granddaddy Purple 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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Reginald Brown –
One of my fastest-growing indoor marijuana plants. They flourished in organic soil and produced abundant harvests. With enormous resinous buds and dark purple blooms, they had a short, bushy growth habit. gave me a nice, grape-like smoke with a hint of spice from the herb. I adore this weed’s cheerful and calming effects. I have no trouble growing it because it can be grown outside and only needs a little blossoming period. Thank you for spreading the goodness of berries and grapes. Regards!
Robert Duncan –
So far, Grandaddy purple takes my depression and sadness away and replaces it with a happy and euphoric feeling. Growing it is not a struggle for me since it can either be grown outdoors and has a short flowering phase. I appreciate the berry and grape goodness it spread. THANKS!
Deegan Francis –
Wow, this is a bombshell strain! One of the fastest marijuana plants that I grew indoors. Thrived them in organic soil and harvested heavy yields. They grew short and bushy with large resinous buds and dark purple flowers. Gave me a flavorful grape-like smoke with a twist of a spicy herb. Love how calming and happy this weed is. Enhanced my mood and an effective painkiller too. An interesting strain the is worth a try!