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🍇 Granddaddy Purple Cannabis Seeds: The Grape & Berry King
If you’re looking to buy Granddaddy Purple seeds in Australia, this is your ticket to some of the most strikingly gorgeous, purple buds on the planet. Otherwise known as GDP, this legendary 70/30% Indica/Sativa is a Cup-winning classic from San Francisco—prized for her unmistakable grape and berry swagger and a deep sense of calm.
Quick Stats
GDP is a potent, Indica-dominant hybrid (70% Indica / 30% Sativa) with THC levels averaging 17–23% (CBD: <1%). She flowers in 8–10 weeks indoors. Outdoors in Australia: North late March–early April • Mid early–mid April • South mid–late April (into May in cooler years). Matty’s tip: drop night temps by 5-10°C in late flower to bring out her purple hues.
The Legend
Born in 2003, GDP comes from an all-star family: a three-way cross of Mendo Purps, Skunk, and Afghan genetics, bred by renowned cannabis pioneer Ken Estes. He was looking for a potent strain that was as gorgeous as it was powerful. He nailed it—and created a legend that’s still a California classic.
Funny Fact: GDP gets its name because it’s the granddaddy of all the purple strains. Ken Estes bred her to be the original, and she still holds the crown.
Flavour & Aroma
- On the nose: A loud, sweet blast of grape and wild berries with subtle hints of earthy funk.
- On the tongue: A burst of sugary grape and berry sweetness, followed by a floral, earthy exhale with a hint of spice.
Matty’s Take: “This strain tastes exactly like it smells. It’s a fruity punch to the face—no weird aftertaste, just pure candy-shop goodness.”
Effects & What to Expect
First wave: An initial, energetic buzz—a nice, clear-headed uplift that puts a grin on your face.
Then it settles: A deep, full-body relaxation sets in, washing away stress and leaving you blissful. It’s a mellow, trance-like high—powerful but not a knockout punch unless you overdo it.
Matty’s anecdote: “After a long day, she’s my go-to. I just put on some music, melt into the couch, and forget about the world for a bit.”
How I Grow It (Matty’s Way)
Skill level: Beginner–Intermediate. She’s forgiving and resilient to pests and mould, which makes her a solid first pick. She stays compact, but a little low-stress training (LST) and topping will boost your yield big time.
Training & support: She’s a bush, not a beanstalk. Top her early to get a wide, flat canopy, and use LST to open up her bud sites for max light penetration.
A GDP-specific quirk: To get those famous deep purple hues, drop the night-time temperature by 5-10°C in the final two weeks of flower. It’s a magic trick that makes her pop.
Matty’s Feeding & pH Know-How: “Soil 6.0–6.5; coco/hydro 5.5–6.0. She’s a moderate feeder. Don’t go overboard—she prefers a steady, balanced diet over massive nutrient swings.”
Grow Log: Inside the Tent
| Phase/Week | Key Action/Status | Matty’s Tip |
|---|---|---|
| Veg Week 3 | Compact, bushy growth; topped and started LST. | She loves light—make sure to open her canopy up with LST so every bud site gets some sun. |
| Flower Week 4 | Buds stacking, with a sugary scent. No real stretch. | Keep airflow up and temps stable. Don’t push her with too much food—she’s not a pig. |
| Flower Week 7 | Colas bulking up; hints of purple in the leaves. | This is your last chance to drop the night temps. It’s a secret trick for those deep colours. |
| Harvest Week 9 | Trichomes are milky-white; a few have turned amber. | Flush for a week before the chop. It brings out the sweetness and gives a cleaner smoke. |
🚫 Common Pitfalls to Avoid
- Overfeeding: She doesn’t need a massive feed schedule. Start light, monitor her, and don’t give her more than she asks for.
- Ignoring Temperature: The “purple” is a genetic trigger. Don’t expect deep hues if your grow room stays hot all day and night.
- Harvesting Too Early: She’s an 8-10 week finisher for a reason. Rushing the chop to get your buds will cost you in both yield and potency.
- Poor Air Circulation: She’s mould-resistant, but dense buds need airflow. Stagnant air is an open invitation for trouble.
Matty’s Advanced Notes (For the Nerds)
- VPD & RH: 1.0–1.2 kPa in late veg, 1.2–1.5 kPa in flower. Keep RH between 40-50% in flower to prevent moisture build-up in those dense buds.
- PPFD: 600–800 µmol/m²/s in bloom. She’ll pack on the weight with strong light.
- EC: 1.2–1.4 early veg, 1.6–1.8 in flower. Don’t push it. She’ll show nutrient burn with clawed leaves if you overdo it.
- Temperature Swing: For max purple expression, aim for a 5–10°C drop in night-time temps during late flower. The anthocyanins will pop, turning the buds a beautiful deep violet.
🚫 Mythbusting
Myth: “Purple buds are always more potent.”
Truth (Matty): “Nah, the colour comes from anthocyanin pigments, not THC. The colour is just eye candy, but with GDP, the potency is a bonus.”
Myth: “You have to shock GDP to get it to turn purple.”
Truth (Matty): “Rubbish. It’s in the genes, mate. You just need to keep her happy and let the natural temperature swings bring out the colour. No need to stress her out.”
Myth: “GDP is a knockout strain that’ll put you to sleep.”
Truth (Matty): “That’s only if you go full throttle. Start slow, and she’s a calm, chilled-out ride—not an immediate sleep button.”
Myth: “All purple strains are basically the same.”
Truth (Matty): “Not even close, mate. GDP’s got that grape-berry candy shop flavour locked down — that’s why she’s still the purple queen.”
Who It’s For?
Perfect If You:
- Want to grow a beginner-friendly classic with a world-famous look.
- Love a sweet, fruity flavour profile.
- Need a calm, relaxing buzz without being locked to the couch.
- Want to impress your mates with a beautiful-looking plant.
Maybe Not For You If You:
- You’re only chasing pure Sativa energy.
- You hate a strong grape aroma.
- You can’t control humidity in late flower.
🏆 Final Verdict
- World-famous Indica classic with a stunning look.
- High yield and relatively easy to grow.
- Legendary grape and berry flavour.
- A balanced, relaxing ride that leaves you clear-headed.
Matty’s Final Word: “She’s the original purple queen, mate. Grow her right and she’ll pay you back with some of the best-looking and best-tasting buds on the block. Cheers. 🍻”
