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Tips for growing Granddaddy Purple cannabis

This article is presented by Advanced Nutrients, a global company raising the bud weights and reputations of cannabis growers since 1999.


Strain overview:  A timeless indica classic born in the early 2000s, Granddaddy Purple is a genetic cross between Purple Urkle and Big Bud. This California native produces large buds rich with trichomes and ripe blueberry flavors. Characterized by its sedating attributes, GDP can help with pain, nausea, and many other symptoms.

Grow techniques: Granddaddy Purple is best kept indoors so an ideal climate can be maintained while the large buds take shape. Pruning and humidity control are crucial to keeping powdery mildew and bud rot at bay. Granddaddy Purple is a great strain to explore training techniques that will further increase yields of this vigorous plant. This strain is well suited for both soil and hydro grows. 

Flowering time: 8 weeks

Yield: High

Grow difficulty: Easy to moderate

Climate: GDP prefers a dry climate and can handle a little cold if grown outside. Ideal temperature ranges between 70 and 80 degrees Fahrenheit.

Indoor/outdoor: Keep this strain inside unless you live in a location with dry fall weather; the large colas are prone to rotting if moisture is present.

Feeding: Products high in phosphorous will help keep the buds growing dense and healthy during GDP’s flowering stage. Bat guano and kelp are unique organic products that can be used to increase the strength and development of the plant and buds.

cannabis feed chart

(Courtesy of Advanced Nutrients)

To learn more about feeding with Advanced Nutrients supplements, check out their online nutrient calculator or call their grower support line at 1-800-640-9605.
  • Tom Buchner

    I’d like to try and grow my own but don’t know where to go to buy seeds

    • Paul Harju

      I found AMS both fast and have good products

      • Mike Hendrickson

        AMS does not carry this strain… can you send the url if they do?

        • Lee

          The Attitude Seed bank has GDP by two different breeders.

    • Steven Gray

      Try the Single Seed Centre. I just got my order of 10-seeds of Grandaddy Purple for 19.00 Tax, shipping included. Took about couple weeks to get here. Comes from Amsterdam I believe

      • Lee

        Wow, what a deal. I hope you got what you paid for. No one else sells them that cheap. I paid about $10.00 per seed from Attitude Seed bank

    • Lee

      The Attitude Seed-bank in the UK. I just got mine 3 days ago.

  • Ghost Ghost

    Has anyone grew this bud and could anyone tell me what yield i would get of 6 plants? Thanks

    • Jaekim Smith-West

      mate …asking a yield before you’ve even put the seeds in the ground is like asking how much a baby is going to weight before the lady is even pregnant, you can yield the same off one plant as the 6, Way to many variating factors.

  • Steven Gray

    Hello, I am a first time grower. I have chosen Grandaddy Purple strain for my grow. I suffer bad arthritis in my knees and want this strain for pain relief. I’ve read the material showing the best growing temperature is around 70-80• climate. My concearn is I live in TEXAS!!! I want to grow outdoors a couple plants for my first grow. Now it is July and the temps are at 98-103• degrees. Just now Recieving my seeds I order and am wanting to know if I wait till end of August which is our hottest months, start mid August to germinate my seeds and plant in lill planters and start the process. Replanting after a ffew weeks indoors growth. By September, usually starts coming down in temperatures, and even as late as December the temps here are moderate around 70-85ish I’d say it really don’t start getting cold or cooler til mid January. That being said. I’ve still got Sep, Oct, Nov, and December to do all my growing and harvesting I read that the buds won’t turn purple if it’s not cooler at the time of budding. So do you think I can start in germinating in August indoors and replant with good soil outdoors at beginning of September

    • Lee

      GDP is best grown indoors where the temp and humidity can be controlled.No strains like it as hot as you say it is. They just won’t grow much in that heat. Choose a different strain that is more suitable for outside growing. GDP is not a good choice for outdoors.