Granddaddy Purple Auto
The classic grape indica in fast, automatic form. Deep purple buds from seed to harvest in under 80 days — no light schedule changes needed.
- Type
- Indica
- Lineage
- Granddaddy Purple × Ruderalis
- THC
- 17–22%
- CBD
- <1%
- Flower time
- 9–11 wks (seed to harvest)
- Yield
- Moderate
- Height
- Short
- Grow difficulty
- Beginner
- Climate
- Both
Effects
Flavors & aroma
Dominant terpenes
Myrcene
Earthy, musky, ripe fruitThe most common cannabis terpene; associated with relaxing, heavy 'couch' character.
Pinene
Pine, rosemary, fresh forestAssociated with alertness and clear-headedness.
Caryophyllene
Black pepper, spice, woodThe only terpene that also binds cannabinoid receptors; peppery and warming.
Grower's notes
Start in final pot. 20/4 light throughout. Very compact — great for micro grows and small tents. Goes purple reliably even without cool temperatures. LST only, no topping.
Grow guides for Granddaddy Purple Auto
Matched to this strain's beginner difficulty, both climate, and short structure.
Setting Up the Space: Ventilation, Odor & Electrical Safety
8 min read
Indoor vs. Outdoor: Choosing How You'll Grow
8 min read
Low-Stress Training: Double Your Canopy Without Cutting
10 min read · members
When to Defoliate Cannabis: The Timing That Makes or Breaks It
5 min read
Your First Grow Setup: Three Budgets, Zero Regrets
9 min read
Autoflower Cannabis: The Complete Growing Guide
9 min read
Companion Planting for Cannabis — Allies Your Garden Needs
7 min read · members
Living Soil & No-Till: Feed the Soil, Not the Plant
9 min read
Maximizing Bud Quality: Density, Frost, and Bag Appeal
10 min read · members
Watering in Flower: Frequency, Runoff, and the Dry-Back Cycle
7 min read
LED Grow Light Mastery: PPFD Maps, Spectrum Tuning, and DLI Optimization
11 min read · members
Growing in Cold Climates: Western New York and the Great Lakes Season
9 min read
Micro Growing: Big Results in Tiny Spaces
8 min read
Cannabis Pest Identification: Spider Mites, Thrips, Fungus Gnats, and More
9 min read
Hermaphrodites and Nanners: How to Prevent Seeded Buds
6 min read
Bud Rot (Botrytis): Identification, Prevention, and Damage Control
7 min read
Nitrogen Toxicity: The Dark Green Claw and How to Fix It
5 min read
When to Harvest: Reading Trichomes Like a Grower
6 min read
Drying & Curing: Where Good Grows Become Great
9 min read · members
Educational profile · data varies by phenotype & grow · not medical advice · all strains