Granddaddy Purple

Granddaddy Purple strain is another heavy indica strain that is not of the subtle variety. It is widely used as a powerful knock-me-out – and has therefore become a popular choice for those seeking a heavy body stone.

Its buds are also known for being distinctly good-looking in nature – with the buds boasting of a purple hue mixed with red hairs and some crystallization.

Indoor YieldOutdoor YieldFlowering Period
100% Indica14 to 17 oz / m²17 oz / plant8 – 11 weeks indoors, mid-October outdoors.

A creation straight out of Ken Estes’ San Francisco lab – Granddaddy Purple, otherwise known as GDP cannabis strain is a potent indica marijuana strain. It is popularly used in the treatment of many psychoactive conditions, and in the management of pain.

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GrandDaddy Purple’s parentage stems from the crossing of two indica strains, namely Big Bud and Purple Urkle. This marijuana strain is a native of California, and has earned its reputation for being a reliable relaxant and stress-buster.

Don’t want to read? Watch the strain review on Vimeo or YouTube!

Granddaddy Purple weed strain attributes:
OriginThe Grand Daddy Purple is a product of crossbreeding
Purple Urkle and Big Bud, two popular Indica strains!
Plant type100% Indica
THCUp to 23%
Plant SizeCompact
Flowers9 weeks
Yields14 to 17 oz per 3x3ft
Taste & SmellBerry | Fruity | Grape | Sweet
UsesInsomnia | Lack of appetite | Pain | Stress
Lack of appetite
ClimateBest growing in a humidity controlled environment (GDP likes humidity to hover around 50%).
Grand Daddy Purple

Buy Granddaddy Purple Seeds

  • 100% indica
  • Extreme THC levels up to 23%
  • Great beginner grow
  • Deep relaxation with a calming buzz
  • Feminized seeds for guaranteed results

Effects of GDP Strain

Because GDP is a classic indica cannabis strain, it can create a strong mental high, leaving you to let your thoughts calm down and generate a cool brain buzz.

For those seeking a deep and relaxing recreational high, Grand Daddy Purple offers just that. It is a powerful sleep-aid, which makes it the perfect night-time puff.

Granddaddy Purple plant
Granddaddy Purple Plant

Not only does it help you unwind and let go of all your stresses, but it leaves you feeling happy and content. This is what makes it a great companion for a warm bubble bath at the end of the day.

A sense of euphoria can also be noticed in the effects of Grand Daddy Purple, and with it a sense of elation, and a strong desire to laugh. Sometimes, GDP can encourage a voracious appetite, but isn’t present in every user.

Granddaddy Purple terpenes

The rich aroma of this marijuana strain is derived from linalool, myrcene, β-Pinene, caryophyllene, geraniol and α-Bisabolol.

Aroma & Flavor

Earning its name and reputation, Grand Daddy Purple famously smells like grapes and berries. It is said that a small chunk of GDP can fill a room with its aroma, with a certain sweet and fruitiness lingering in the air.

Grand Daddy Purple tastes much the way it smells – like grapes and berries. It is reminiscent of an earthy pine mixed with the sweet presence of citrus fruits. Some have also described its exhale as something that would remind you of a grape popsicle.

Linaloolfloral, lavender, rose, citrus, wood, rosewood
Myrceneearthy, musky, fruity, clover, hop, pungent
β-Pinenedill, parsley, basil, hops, wood, pine
Caryophyllenespicy, cinnamon, clover
Geraniolfloral, roses, citrus
α-Bisabololfresh, herbal, spicy, chamomile, balsamic, sweet, floral

Adverse reactions

Among the few side effects of Grand Daddy Purple, that have been reported, is dehydration and the sensation of a dry mouth and dry eyes. Other adverse reactions to GDP are mild cases of dizziness and sometimes paranoia, although quite rarely. It is also known to cause a very slight yet lingering headache for some.

Used widely to help manage pain, Granddaddy Purple has proven to be very useful for patients with chronic and acute conditions alike.


GrandDaddy Purple made its way into the scene originally as a medically created strain. It has been touted as a strong healer among other hybrids, and has gained traction it its popularity as a powerful de-stresser.

GrandDaddy Purple strain
Granddaddy Purple

GDP is also perfect for those who suffer from irregular sleep patterns, for its ability to relax both the mind and body to aid one to a night of restful sleep. In many cases, it is used in the battle against anxiety and depression, relieving the mind of its worries.

For cancer patients, it has also proven to help rid one of nausea brought on by radiation and chemotherapy. This makes it also an important factor in restoring appetite in those who are under medication or suffer from anorexia nervosa.

Growing Granddaddy Purple Strain

Relatively resistant to common diseases, Grand Daddy Purple is quite easy to grow, as long as you pay close attention to the humidity levels, which it prefers at about 50%. GDP prefers a well ventilated space for growth, and can be trimmed to create more room for it to flourish.

Granddaddy Purple Strain Price

The average price of GDP is $10-$15 per gram, $50-60 per 1/8th oz, $95-$105 per 1/4 ounce, and $195-$215 per 1/2 ounce.

Indoor Yield

Kept indoors, GDP is quite happy in hydro or soil alike, with it flowering as average of about 8 – 11 weeks. It can yield up to an estimated 19 ounces per square meter.

Outdoor Yield

When grown outdoors, Grand Daddy Purple has the capacity to grow into a dense bush, generating a generous yield at about 17 ounces per plant. It is ready for harvest around the weeks of Mid-October.

Origin, Genetics, Lineage

FAQ About Granddaddy Purple cannabis

What is the GrandDaddy Purple strain yield?

GrandDaddy Purple yields 14 to 17 ounces per square meter indoors and 17 ounces per plant outdoors.

How much THC does Grand Daddy Purple strain have?

Up to 23%

What are the origins of the Grand Daddy Purple strain?

Grand Daddy Purple was first bred in California, by crossbreeding Purple Urkle and Big Bud.

Have you ever smoked or grown your own Grand Daddy Purple? Please let me know what you think about this marijuana strain in the comments below.


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Robert Bergman


Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations ... See profile

23 comments on “Granddaddy Purple”

  1. Tried GDP this year and germinated seeds planted 4-21-2023 in small pots, and kept protected outside. Moved up to 25 gal on Memorial day. All plants were healthy with very good root systems. GDP Plants went into flowering on 05-27. As of 06-28 GDP looks healthy, dark green, and budding, but only 28 inches tall. My other strains have remained in vegetative state, and are growing like crazy. Please advise

    • Hi Mike,

      Thanks for your message. Sorry to hear that. Did you purchase these with us at ILGM? I tried to look up the order and could not find any associated with your full name or email address.
      If you purchased these with us, please reach out to our customer support team with your order number at [email protected] and they can help you out with this, of course.

      And I imagine you are sure these are photoperiod seeds, right?

      If these are our seeds we’d be happy to help you out with this, if these were purchased elsewhere I’d recommend reaching out to the supplier.

      Kind regards and happy growing,

    • Hi Ray,

      We certainly love this strain! And its one of our most popular strains for good reason!

      Happy growing,

  2. 3 gdp plants last year , very good results with your feminized seeds, but this year your feminized seeds produced short, 1 to 1 1/2 feet tall, plants with 3 fingered leafs, and are starting to flower already.

    • Hi Steve,

      Thanks for letting us know. Our customer support team will reach out to you so we can have a look and help you out with this, no worries!

      Kind regards,

  3. Harvested last thurs day 70. 2 years experience. super easy grow! Indoors, HID lighting, botanicare nutes. responds well to hst but will need bud weight support with scrog or stakes. Can tolerate high temps but don’t attempt to bring it back down too low. excellent terps! mid to large size nuggets. very impressed with the trich content! It’s drying now and smells wonderful. i did sample some but i’d wait a while before judging the high.

  4. I’d like to know when I should pick the buds. The plant looks nice and it’s over from when supposed to be done. To me it looks like it still has a couple of weeks to go. So should I pick it now or wait? Everyone jokes around about 2 more weeks but I just don’t know what is right

  5. Hwy I’m currently growing four of the grand daddy purple it’s amazing I love the buds on it I’m a experience grower for ten years now this is by. Far one of the best top knotch buds I’ve ever grown

  6. Robert. I really like reading your articles.
    I live in in northern Kalifornia, Sierra foothills. 1750′ elevation. Mild springs, 80+ Hot summers 90-100’s, fall, low to mid 80’s. Which strain do you recommend with high yield in my area.

  7. I grow grandaddy purple x Harlequin every year outside, they grow to 8ft tall by 6ft wide, with a trunk rather than a when, they grow to huge dense bushes which start green and turn dark purple halfway into flowering, a totally unique smell and flavour, very sticky buds which turn almost silver when dry due to the amount of trichomes on them, this plant cured my cancer, I swear by it


  9. Anthony no disrespect to you but I have to disagree to what you said. I’m from Northern California but moved away 3 years ago but before I left GDP was everywhere. Not just in the dispensaries either. I personally knew 2 growers back home that GDP was all they grew but one of the guys stopped growing and the other guy I lost contact with. GDP probably was created to be mainly for medical use but its mainly used as a recreational purpose where I’m from. You can find it on the streets anywhere In NorCal, seeds and clones, I just don’t want to travel back home to be able to get it. I’m so many states away and the cost of a plain ticket compared to the cost of buying them online is way more.

  10. Hi Jasper . . maybe I can help you out on your thoughts and frantic search to find about ” Grand Daddy Purple” … keep in mind that GDP was originally developed in laboratory for specific purposes to appease the needs of its users in the medical marijuana industry. To be honest with you.. GDP is a designer medication for people who are having difficulties with non treatable illnesses and ailments that require the sort of results you get from GDP, and this strain of marijuana may or should only be used by people who are suffering from unknown or un conventionally medical treated methods .. You have to agree with me, and may further find that GDP is not really intended as a recreational use as you would not expect to sit around with a few of your friends and start sharing a bong packed with GDP. I trust and suggest you look around this site here at ILGM ….and look at some of the hybrid hear on this site you should be better off. If you re read what Robert says in his description of GDP… “that is not of the subtle variety and It is widely used as a powerful knock-me-out” smoke. So that being said if you are lookin for the knock me out smoke, than you should continue to exhaust yourself finding GDP.. and in the alternative there should be no real reason to migrate away from Robert Bergman’s Lab . . . Just ask Robert what you would like to achieve and he will set you in a better direction.
    GDP is not something you could plan on sharing with friends as its more of a product of last resort to treat it’s users from suffering the physical pains and sufferance of certain Un-treatable illnesses. I hope I did not offend your intentions or personal wellness with my opinion as I am only a member of this blog.

  11. I’ve been looking everywhere for GDP Feminize seeds but can’t find it to save my life. I clicked on the link here but it took me to ILGM seeds but Robert I can not find them. Please help

  12. Robert . . .the Grand Daddy Purple . . the name itself seems to indicate the high quality and nature of its users beneficial use, and as I understand this Indica strain was crossed and developed for a few specific purposes and with good intend, and Its in my personal opinion * best used in the comfort of your own home and not a kind of novice smokers choice. As if I may understand if the benefits of GDP from a first time users prospective would probably only be determined by experiencing oneself in its euphorically induce state of mind. I would most likely indulge myself and tread a little lightly until I was able to establish myself with GDP.
    I would put GDP a few notches above the best Afghanistan strains , and if i ever have the opportunity now or in the near future I would probably say with scientific certainty if I plan to try the ” Grand Daddy Purple ” , I can assure you I may spoil myself into not smoking any other weed. I would pay and expect a single seed to sell for $180.00 USD . . .a well worth grow for what results your may find ahead of you.

    • Oh my God this is absolutely torturous to read, stop trying to sound intelligent with your overly extravagant and completely butchered language, you clearly don’t have a clue how ridiculous this sounds.

      • Damn dude. Give they guy a break. Do you enjoy your lofty position as editor at large?