Cannabis Strain Guide -  

Granddaddy Purple (GDP)

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Marijuana Strain Descriptions

Granddaddy Purple (GDP)
Cannabis Strain Summary
Terpene Profile- Primary
Myrcene (dominant terpene contributing grape, berry, earthy, musky notes and relaxing properties)
Terpene Profile- Secondary
Beta-caryophyllene (spicy, peppery complexity); Alpha-pinene (fresh, woody, pine undertones); Linalool (floral, lavender-like); Humulene (hoppy, earthy); Limonene (citrus). Note: Exact percentages vary significantly by cultivator, harvest timing, curing, and batch genetics.
The Experience- Common Effects
Relaxed; Sleepy; Euphoric; Happy; Hungry (significant appetite stimulation); Muscle tension relief; Physical discomfort reduction; Mental ease and contentment.
The Experience- Duration
2-4 hours when smoked/vaporized (peak intensity 1-2 hours); Edibles: 45-90 min onset, effects persist 4-6+ hours; Smooth comedown transitioning to drowsiness conducive to sleep.
The Experience- Onset
Onset within 5-15 minutes (smoked/vaporized); begins with gentle cerebral lift, euphoria, dreamy mental state; body effects intensify over 15-30 minutes with warm, heavy sensation cascading from head through limbs ('melting' feeling); peak delivers profound full-body relaxation; can transition to couch-lock at higher doses; thoughts drift in relaxed, contemplative state.
The Experience- Potential Side Effects
Dry mouth (common); Dry eyes (common); Dizziness (less common, typically with low tolerance or high doses); Mild paranoia (uncommon, typically with overconsumption).
Strain Type
Indica-Dominant Hybrid
Not Recommended For
Activities requiring alertness, physical coordination, or mental sharpness; Driving or operating machinery; Demanding creative or analytical work; Vigorous exercise; Daytime productivity tasks.
Lineage and Origins
Created in 2003 by Ken Estes in San Francisco Bay Area. Cross between Purple Urkle (deep purple coloration, grape-berry aromatics from Mendocino Purps/Afghani lineage) and Big Bud (massive flower structure, resin production). Alternative lineage references Mendo Purps, Skunk, Afghan genetics. Won multiple competitions including Green Cup 2004-2006 and 2015 High Times Cannabis Cup Best U.S. Indica.
Cannabanoid Profile
THC: 17-27% (most batches 20-23%); CBD: <1%; Minor cannabinoids (CBG) in trace amounts; High THC-to-CBD ratio produces powerful psychoactive effects and physical relaxation; Potency varies by genetics, growing conditions, and phenotype.
Comparable Strains
Purple Urkle (parent strain; grape-berry profile, deep purple; more sedative, less yield-focused); Grape Ape (similar Mendo Purps lineage, grape flavor, indica-heavy; includes Afghani/Skunk genetics, often confused with GDP); Purple Punch (GDP x Larry OG; purple buds, relaxing; sweeter candy-like flavor, slightly less sedating); Purple Kush (pure indica, full-body relaxation, sleep-promoting; earthier less fruity, possibly heavier); Blackberry Kush (indica-dominant, berry aromatics, sedative; blackberry vs grape flavor, diesel undertones).

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Cultivation Resilience
Moderate resilience to pests/pathogens; Prefers dry climates; High moisture sensitivity; Requires humidity control: 40-50% during flowering, dropping to 40% in final 2 weeks; Risk of powdery mildew and bud rot with dense flowers; Temperature: 70-80°F daytime, 10-15°F cooler at night; Cooler nighttime temps in late flowering enhance purple pigmentation.
Cultivation Flowering Time
Indoor: 8-11 weeks (typically 9 weeks/60-65 days); Outdoor: Mid-to-late October (Northern Hemisphere); Harvest when trichomes appear milky-white to amber under magnification.
Cultivation Yield
Indoor: 14-19 oz/m² (400-550g/m²) with optimal conditions pushing higher; Outdoor: 17+ oz/plant (500+ g/plant), some reports exceeding 3 lbs/plant in ideal scenarios; Generous yields when grown with care.
Cultivation Plant Structure
Compact, bushy indica structure; Indoor height: 3-4 feet; Outdoor height: 6-8 feet; Strong central stem with lateral branching; Tight internodal spacing; Dense, heavy buds requiring branch support in final weeks; Responds well to LST and topping.
Cultivation Quality Indicators
Deep purple coloration on calyxes/leaves contrasted with bright orange pistils; Dense, chunky bud structure feeling substantial in hand; Heavy trichome coverage giving frosted, crystalline appearance; Pungent grape-berry aroma immediately apparent; Proper cure with slightly springy texture (not brittle or overly moist); Avoid brown appearance, musty/hay smell, extreme dryness/dampness, or mold signs.

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Granddaddy Purple (GDP)

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