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Granddaddy Purple No 17 Shop
The Official Cannabis collection · sheet 17No 17 · Granddaddy PurpleEffects

Effects

Granddaddy Purple effects: what people report

People most often describe Granddaddy Purple as sleepy and relaxing: those are Leafly’s top two reported effects, with hungry third, and Leafly rates it mostly calming. Weedmaps users add euphoric, and AllBud describes a cerebral rush before deep relaxation. Dry mouth, dry eyes and dizziness are the most-reported downsides.1,2,3

This page reports what people and breeders describe. It is not medical advice, and it makes no claim that Granddaddy Purple treats or prevents any condition.

What each source reports

SourceReported effectsReported downsides
Leafly users (5,727 ratings)Sleepy, relaxed, hungry; rated mostly calming1Dry mouth, dry eyes, dizzy1
Weedmaps usersRelaxation most often, then sleepy and euphoric; “euphoric, hazy opening that quickly settles into deep relaxation and sleepiness”2—
AllBud (69 reviews)Euphoria, happy, hungry, relaxing; a cerebral rush, then a deep sense of relaxation3—
Royal Queen Seeds (seed seller)Euphoric, physically relaxing, sleepy; its autoflower lists physically relaxing, sleepy, uplifting4,5—
Grand Daddy Purp, Ken Estes’s seed line (via SeedFinder)Calls it “The Nighttime Strain”6—
Apothecary text (via SeedFinder)“Surprisingly alert and energetic rather than sedating”7—

These are self-reports and marketing descriptions, not clinical findings.

Energizing or sleepy?

Sleepy, by most accounts. Leafly places Granddaddy Purple on the calming side of its calming-to-energizing scale with sleepy as its top effect, Weedmaps describes a high that settles into deep relaxation and sleepiness, and Leafly’s list of the 100 best strains files it under strains for feeling sleepy.1,2,8 The outlier is the Apothecary text on SeedFinder, which calls its buzz “surprisingly alert and energetic rather than sedating”.7

Why two batches can feel different

Potency alone varies widely: one in ten lab-tested batches came in under 13.34% THC and one in ten above 23.62%, and Michigan’s median (13.93%) sits well below Washington’s (22.51%).9 The name also covers different plants: Ken Estes’s own seed line, a clone sold by Dark Heart Nursery, nine breeders’ seed versions on SeedFinder and an autoflower that adds Big Bud Auto, and Leafly’s Purps history notes that sometimes even Granddaddy Purple doesn’t come out purple (see genetics).2,5,6,10,11

Sources

  1. Leafly, Granddaddy Purple (aka GDP) strain information. Accessed Oct 4, 2026.
  2. Weedmaps, Granddaddy Purple strain page. Accessed Oct 4, 2026.
  3. AllBud, Granddaddy Purple marijuana strain information and reviews. Accessed Oct 4, 2026.
  4. Royal Queen Seeds, Granddaddy Purple feminized seeds (data sheet). Accessed Oct 4, 2026.
  5. Royal Queen Seeds, Granddaddy Purple Auto seeds (data sheet). Accessed Oct 4, 2026.
  6. SeedFinder, Grand Daddy Purp (Grand Daddy Purp): strain info, cannabinoids and genealogy. Accessed Oct 4, 2026.
  7. SeedFinder, Grand Daddy Purple (Unknown or Legendary): strain info and Apothecary breeder description. Accessed Oct 4, 2026.
  8. Leafly, Leafly’s 100 best weed strains of all time (2026-07-14). Accessed Oct 4, 2026.
  9. Cannlytics (CC BY 4.0), cannabis_results: public state lab results (filtered and aggregated by Official Cannabis). Accessed Oct 4, 2026.
  10. SeedFinder, All Granddaddy Purple strains. Accessed Oct 4, 2026.
  11. Leafly, Pleased as Purple Punch: a ‘Purps’ family genealogy (Amelia Williams) (2021-04-08). Accessed Oct 4, 2026.