How to Grow Granddaddy Purple x Bruce Banner
Granddaddy Purple x Bruce Banner is a potent, colorful, indica-dominant feminized strain that crosses two modern heavyweights. It is a 70/30 indica with a high 24-28% THC, a sweet, spicy flavor, and a euphoric, energetic, aroused effect. It blends the purple, grape-sweet character of Granddaddy Purple with the raw power of Bruce Banner for a strong, lively result.
As a feminized strain, Granddaddy Purple x Bruce Banner produces only female, flower-bearing plants, so you can skip sexing and remove the guesswork of sorting out males. Every seed goes toward productive, bud-growing plants from the start. You grow it under long days through its vegetative stage, then switch the lights to 12/12 to trigger flowering, which gives you full control over the plant’s final size and its timing.
Recommended Strains
Grandaddy Purple x Bruce Banner
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THC | 24% - 28% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 70% Indica / 30% Sativa |
Grandaddy Purple x Do-Si-Dos
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THC | 20% - 24% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 80% Indica / 20% Sativa |
Potent, aromatic and beginner-friendly, this strain is a rewarding grow. You can see the full genetics and buy Granddaddy Purple x Bruce Banner seeds on the strain page, and browse the rest of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | High (24-28%) |
|---|---|
| Lineage | Granddaddy Purple x Bruce Banner |
| Type | Feminized |
| Genetics | 70% Indica / 30% Sativa |
| Climate | Warm, dry |
| Flowering time | 8-10 weeks |
| Harvest (outdoor) | October |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.64 oz/ft² (500 g/m²) |
| Yield outdoor | 10.58 oz/plant (300 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Spicy, Sweet |
| Effects | Euphoric, Energetic, Aroused |
Promos & Deals
Growing a Feminized Strain
Granddaddy Purple x Bruce Banner is a photoperiod feminized strain, which means it flowers in response to the light cycle rather than its age. You keep it under long days, usually 18 hours of light, for as long as you want it to grow and build structure, then switch to 12 hours of light and 12 hours of darkness (12/12) to tell the plant to start flowering. Because every seed grows into a female, there are no males to find and remove, so your whole crop goes toward buds.
That control over timing suits a compact, indica-leaning plant like this one well. It has a manageable 1.5 m frame with a moderate stretch after the flip, so flip it once it has filled your space, and use the vegetative stage to top and train it. Spreading the canopy opens up the many bud sites and helps every flower fatten evenly across its 8 to 10 week bloom.
Climate and Where to Grow It
Granddaddy Purple x Bruce Banner does best in a warm, dry climate, which suits its dense, resinous buds by keeping humidity off them late in flower. Outdoors in the Northern Hemisphere it finishes around October, so it needs a dry, steady autumn to ripen those heavy colas cleanly. At a manageable 1.5 m it fits comfortably in a tent and stays easy to handle in the ground or a large pot outside.
Its yield is high indoors, around 500 g/m² in an optimized setup, and more modest outdoors at 300 g per plant, so it is especially rewarding under lights. As a dense, resinous indica, its very high 24-28% THC places it firmly among our high-THC seeds, one of the stronger crosses in the catalog.
That potency and color come straight from its parents: Granddaddy Purple lends the deep purple tones, grape-sweet character and dense, chunky structure, while Bruce Banner brings the raw strength, heavy resin and lively, energetic lift. Keep temperatures around 68-80°F (20-27°C) and humidity on the low side through flowering, and let the nights cool a little late in bloom to coax out the purple.
Feeding Schedule (EC Guide)
Granddaddy Purple x Bruce Banner is a resinous, productive plant that feeds moderately well, but build the nutrients gradually rather than pushing it hard early. Start light while it is young, build through the vegetative stage, shift toward phosphorus and potassium once it flips into flower, then flush at the end so the sweet, spicy notes come through clean. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.5-0.7 | Very light feed while roots establish |
| Vegetative | 1.2-1.6 | Raise nitrogen as the plant builds structure |
| Early flower | 1.4-1.7 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.6-1.9 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Once you flip it to 12/12, Granddaddy Purple x Bruce Banner finishes in about 8 to 10 weeks, a reasonable timeline for such a resinous, very high-THC strain. It builds dense, chunky, trichome-coated buds on a compact frame, often turning deep purple in a cool finish, developing a sweet, spicy aroma with a grape-like edge as it ripens. That heavy frost is a clear sign of its serious potency.
Yields are high indoors at around 500 g/m² and more modest at 300 g per plant outdoors. Keep the colas supported and the canopy open so light reaches the lower buds, feed it steadily through flower, and harvest when most of the trichomes have turned cloudy with a few amber for the fullest sweet, spicy flavor and the most rounded, potent effect.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry matters with such dense, resinous buds, because they can stay damp in the middle while the outside dries, and a gentle dry protects both the sweet, spicy aroma and the deep purple color.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the sweet, grape and spicy notes and smooths the smoke, turning a freshly dried harvest into the rich, colorful, flavorful result this cross is known for.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Granddaddy Purple x Bruce Banner is a very resinous, frosty plant, so its trim is excellent for dry sift, bubble hash or rosin. That heavy resin and sweet, spicy aroma make the trim genuinely valuable, turning offcuts into a potent, flavorful concentrate run rather than waste, a real bonus with such a high-THC strain.
Flavor and Terpenes
Granddaddy Purple x Bruce Banner leads with a sweet flavor, a grape-like sweetness from its Granddaddy Purple side, balanced by a warm, peppery spice. It is a smooth, rich smoke, and a good cure brings that sweet-and-spicy character forward in the jar and on the inhale, with the grape note deepening as it settles.
Its terpene profile shapes that flavor. Caryophyllene drives the peppery, spicy edge, while myrcene forms a sweet, earthy base. Alpha-pinene and beta-pinene add a fresh lift, linalool a soft, floral sweetness, and humulene with a touch of terpinolene round out a sweet, spicy, aromatic profile.
Effects and Best Use
With its very high 24-28% THC and indica-leaning 70/30 make-up, Granddaddy Purple x Bruce Banner delivers a potent, lively experience. It is reported as euphoric, energetic and aroused, pairing an uplifting, stimulating head with a strong body presence, an unusually active profile for an indica thanks to its Bruce Banner side. Its potency is genuinely high, so a measured dose goes a long way, especially for newer smokers.
That euphoric, energetic profile makes it a rewarding strain for an upbeat, sociable session, alongside its sweet, spicy flavor. The combination of exceptional potency, deep purple color and a lively, energizing effect is exactly why Granddaddy Purple x Bruce Banner stands out among feminized strains.
Common Problems and Pro Tips
Granddaddy Purple x Bruce Banner is forgiving and beginner-friendly, but its dense, resin-packed buds are the thing to watch in late flower. Those tight colas can trap moisture, which is why it prefers a dry climate, so keep the air moving and hold the humidity low as the flowers fill out to avoid trouble in the heart of the bud. Do your topping and training early, during the vegetative stage, so the plant has time to recover before it flips.
At a manageable 1.5 m it is easy to handle, and gentle, low-stress training during veg opens the canopy so light reaches every bud site across its 8 to 10 week bloom. Defoliate a few of the largest fan leaves if the center gets crowded, and support the heavier colas as they swell, because the resin-packed flowers can get weighty toward the end.
As a pro tip, make the most of its color and heavy resin: let the late-flower nights run cool for the richest purple, keep the humidity low and the feed steady, and protect the terpenes with a proper plain-water flush and a full three to four week cure. Save the frosty trim for concentrates, and harvest when most trichomes are cloudy with a few amber for a rich, potent, sweet-spicy result.
FAQ
Is Granddaddy Purple x Bruce Banner a feminized strain?
Yes. It is a photoperiod feminized strain, so every seed grows into a female, flower-bearing plant and you never have to sex or remove males. You grow it under long days through the vegetative stage, then switch the lights to 12/12 to trigger flowering, which gives you full control over the plant’s size and when it finishes.
How much THC does Granddaddy Purple x Bruce Banner have?
It is a very potent strain, testing from about 24% up to 28% THC depending on the phenotype and how it is grown. Combined with its indica-leaning 70/30 genetics and its Bruce Banner side, the result is a euphoric, energetic, aroused effect. Because the potency is so high, it is well worth dosing carefully, especially if you are newer to strong strains.
How long does Granddaddy Purple x Bruce Banner take to flower?
It finishes in about 8 to 10 weeks once you switch it to a 12/12 light cycle, a reasonable timeline for such a resinous, high-THC strain. Outdoors in the Northern Hemisphere it is typically ready to harvest around October. Giving it the full window lets the dense buds pack on resin and develop their sweet, spicy flavor.
Does Granddaddy Purple x Bruce Banner turn purple?
Yes, it often does. The purple tones come from its Granddaddy Purple side and show most strongly when the nights cool down a little late in flower. Let the temperature drop a few degrees after lights-off in the final couple of weeks and the buds tend to deepen in color. It is largely genetic, so a cool finish simply brings out the best of it.
What does Granddaddy Purple x Bruce Banner taste like?
It has a sweet, grape-like flavor from its Granddaddy Purple parent, balanced by a warm, peppery spice. Caryophyllene drives the spice, myrcene a sweet, earthy base and linalool a soft floral note. A proper three to four week cure brings that sweet-and-spicy character forward on the inhale, with the grape note deepening as it settles.
How much does Granddaddy Purple x Bruce Banner yield?
It is a strong indoor producer, giving around 500 g/m² in an optimized setup, and more modest outdoors at 300 g per plant. It is especially rewarding under lights. Give it good light penetration, an open canopy and support for the heavy colas to get the most from its dense, resinous, very potent buds.
