Purple Thai
Also known as: Oregon Purple Thai, OPT
Breeder: DJ Short
Oregon Purple Thai (OPT) is a legendary sativa-dominant cultivar created by DJ Short in 1979 by pollinating a Chocolate Thai female with Highland Oaxacan Gold pollen. One of the foundational strains in modern cannabis breeding, it served as a parent to DJ Short's famous Flo and contributed to the genetic lineage of Blueberry. Known for its naturally vivid purple coloration, cerebral potency, and complex chocolate-coffee-berry flavor profile, Purple Thai represents an era when American breeders first began hybridizing equatorial landrace sativas. The strain expresses deep royal purple hues without cold stress, a trait inherited from its Thai parentage that made it exceptional for its time and a cornerstone of purple genetics.
Lineage & Genetics
Cross: Chocolate Thai x Highland Oaxacan Gold
Chocolate Thai is a rare Thai landrace sativa prized for its unique chocolate and coffee flavors, long flowering time, and potent cerebral effects. It was one of the legendary Thai stick genetics that circulated in the United States during the 1970s and early 1980s. It contributes the chocolate-coffee terpene profile, soaring cerebral potency, and the natural purple coloration. Highland Oaxacan Gold is a Mexican landrace sativa from the mountainous Oaxaca region, known for its golden trichomes, earthy-sweet flavors, energizing effects, and vigorous growth. It contributes structural vigor, berry and spice notes, and improved yield over the pure Thai parent.
Terpene Profile
Myrcene — Provides the earthy, musky foundation that grounds the chocolate and berry notes; contributes to the physical component of the effects
Limonene — Adds citrus brightness and supports the energizing, mood-elevating cerebral effects
Caryophyllene — Contributes peppery spice and warmth that complements the chocolate and coffee character
Pinene — Provides herbal, pine freshness that adds complexity to the exhale
Aroma: Complex and unusual — rich chocolate and dark roast coffee dominate, layered with berry sweetness, earthy spice, and subtle pine. The nose is unlike typical cannabis strains and immediately distinctive. Breaking the buds releases the full cocoa-berry complexity with a deep, resinous quality.
Flavor: Chocolate and coffee on the inhale with berry and earth through the mid-palate. The exhale carries spicy warmth and a lingering cocoa-berry aftertaste. The flavor profile is remarkably unique among cannabis strains and becomes more complex with an extended 4-6 week cure that develops the cocoa and berry notes fully.
Effects & Experience
Onset: Arrives as a soaring cerebral rush — immediate mental energy, euphoria, and heightened awareness that is unmistakably sativa.
Intensely cerebral and energizing. The high is clear-headed, creative, and motivating — promoting deep focus, artistic inspiration, and physical energy without anxiety or racing thoughts. The sativa dominance is pronounced: users report feeling wired, talkative, and deeply engaged with creative tasks. There is minimal body sedation, making this a true daytime strain for productive use. At higher doses, the cerebral intensity can become overwhelming for inexperienced users.
Duration: 3-4 hours
Commonly Reported Uses
Grower's Notes
Purple Thai is a tall, vigorous sativa that demands vertical space and patience but rewards growers with stunning purple spears coated in frost. Its landrace Thai heritage drives aggressive stretching in early flower — expect 2-3x height gain after flip. Natural purple expression occurs without cold stress, though cool night temps (60-65°F) in late flower will deepen coloration dramatically.
Training & Structure
Topping early and employing SCROG or heavy LST is essential indoors to manage height and create an even canopy. Without training, plants will easily exceed 8 feet. Supercropping main stems during veg builds knuckles that support heavy lateral branching.
Lighting
High-intensity lighting (600W HPS or equivalent LED at 800+ PPFD) is critical for dense bud development on this sativa. Insufficient light produces airy, underdeveloped flowers. The tall canopy means side-lighting or vertically stacked setups can improve lower bud site quality.
Nutrients
Moderate feeder during veg with standard NPK ratios. Increase phosphorus and potassium during flower weeks 4-8. Sensitive to nitrogen excess in flower which can delay ripening and diminish purple expression. CalMag supplementation helps during heavy flowering.
Climate & Environment
Thrives at 75-85°F daytime with 10-15°F nighttime drop. Humidity must be reduced to 40-50% during flowering due to the long flower cycle — extended bloom periods increase mold risk on dense terminal colas. Strong airflow and defoliation of interior fan leaves mid-flower are critical.
Flowering & Harvest
The 10-12 week flower time tests patience but rushing harvest loses potency and terpene complexity. Watch trichomes carefully — this strain benefits from 20-30% amber for full expression of its chocolate-berry profile. Outdoor growers in temperate climates should plan for late October harvest or use a greenhouse to protect from fall rains.
Pest & Disease
Good natural resistance to common pests inherited from landrace genetics. Main vulnerability is botrytis (bud rot) due to long flower cycle in humid conditions. Preventive IPM with Bacillus subtilis foliar sprays in early flower recommended.
Drying & Curing
Slow dry at 60°F / 60% RH for 10-14 days to preserve the delicate chocolate and coffee terpenes. Extended cure of 4-6 weeks in jars develops the complex berry-cocoa nose that defines the strain. Purple pigmentation intensifies during a proper cure.
History & Origin
Purple Thai — formally known as Oregon Purple Thai (OPT) — was created by DJ Short in 1979, making it one of the oldest deliberate cannabis hybrids still discussed in breeding circles today. DJ Short, working in Oregon, pollinated a Chocolate Thai female with Highland Oaxacan Gold pollen during an era when American breeders were first experimenting with crossing equatorial landrace varieties. The resulting hybrid displayed striking natural purple coloration inherited from the Thai parent — a rare trait at the time that made it highly prized. Purple Thai became a cornerstone of DJ Short's breeding program. He used it as a parent to create Flo (Purple Thai x Afghan) and it contributed to the genetic lineage that eventually produced his most famous creation, Blueberry. The strain's legacy in cannabis genetics is foundational — it represents one of the earliest successful attempts to preserve and hybridize rare Thai genetics in a Western growing context.
Notable Crosses
Strains bred using Purple Thai as a parent:
Frequently Asked Questions
7 common questions about Purple Thai
What is Purple Thai and what are its genetics?
Purple Thai is a sativa cannabis strain (80% Sativa / 20% Indica) bred by DJ Short. It is a cross of Chocolate Thai x Highland Oaxacan Gold, testing at 20-24% THC. Oregon Purple Thai (OPT) is a legendary sativa-dominant cultivar created by DJ Short in 1979 by pollinating a Chocolate Thai female with Highland Oaxacan Gold pollen. One of the foundational strains in modern cannabis breeding, it served as a parent to DJ Short's famous Flo and contributed to the genetic lineage of Blueberry.
What does Purple Thai smell and taste like?
Purple Thai's dominant terpenes are Myrcene. The aroma is described as complex and unusual — rich chocolate and dark roast coffee dominate, layered with berry sweetness, earthy spice, and subtle pine. the nose is unlike typical cannabis strains and immediately distinctive. breaking the buds releases the full cocoa-berry complexity with a deep, resinous quality.. The flavor profile features chocolate and coffee on the inhale with berry and earth through the mid-palate. the exhale carries spicy warmth and a lingering cocoa-berry aftertaste. the flavor profile is remarkably unique among cannabis strains and becomes more complex with an extended 4-6 week cure that develops the cocoa and berry notes fully..
What are the effects of Purple Thai?
Arrives as a soaring cerebral rush — immediate mental energy, euphoria, and heightened awareness that is unmistakably sativa. Intensely cerebral and energizing. The high is clear-headed, creative, and motivating — promoting deep focus, artistic inspiration, and physical energy without anxiety or racing thoughts. Duration is typically 3-4 hours. Commonly reported uses include Creative focus, Energy and motivation, Depression relief, Social engagement.
How hard is Purple Thai to grow?
Purple Thai is rated moderate-hard difficulty. It flowers in 10-12 weeks, reaches tall; 5-8 ft indoors, 10-13 ft outdoors in height, and yields 450-500 g/m² indoors. Best suited for warm tropical climate, 75-85°f, 40-50% rh flower environments.
What are the parent strains of Purple Thai?
Purple Thai is a cross of Chocolate Thai and Highland Oaxacan Gold. Chocolate Thai is a rare Thai landrace sativa prized for its unique chocolate and coffee flavors, long flowering time, and potent cerebral effects. It was one of the legendary Thai stick genetics that circulated in the United States during the 1970s and early 1980s.
Does Purple Thai turn purple?
Yes. Purple Thai is known to express purple coloration, with reported colors including deep purple, green, orange pistils. Cooler nighttime temperatures during late flowering typically intensify anthocyanin expression.
What strains were bred from Purple Thai?
Purple Thai has been used as a parent in several notable crosses, including Flo, Blueberry (lineage contributor). Its genetics contribute to a wide range of modern cultivars.
Sources & References (6)
- https://en.seedfinder.eu/strain-info/Purple_Thai/Unknown_or_Legendary/
- https://blimburnseeds.com/purple-thai/
- https://cannapedia.ai/strain/purple-thai/
- https://leafwell.com/cannabis-strains/purple-thai
- https://skunkglobalmarijuanaculture.com/cannabis-world-news/organic-growing/seeds-genetics-breeding/breeding-the-culture-dj-short-and-the-creation-of-the-blue-family-lines-2/
- https://darkcoastseed.com/blueberry-strain-history-dj-short/
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