Granddaddy Purple is one of the great California indicas, celebrated for its fruity aroma and heavy effects. With Granddaddy Purple Auto, Royal Queen Seeds brings that legacy into a fast autoflowering format by crossing Granddaddy Purple with Big Bud Auto. The GDP side traces back to Purple Urkle, while Big Bud Auto adds speed and productivity.
Her genetics come in at 75% indica / 20% sativa / 5% ruderalis, and THC levels reach up to 19%. That is a strong figure for an autoflower and gives the high plenty of depth.
From germination to harvest, she needs just 70–85 days, or about 10 to 12 weeks. No 12/12 switch is required: keep your lights on 18/6 or 20/4 throughout and she will start flowering automatically.
Indoors, plants reach a manageable 2 to 4 feet (60–120 cm), and outdoors they grow to 3 to 5 feet (90–150 cm). With her quick lifecycle, outdoor growers can plan multiple harvests across a warm season.
Flavor and Effects: Fruity Depth, Heavy Finish
Granddaddy Purple Auto produces a complex, multi-layered bouquet. Juicy blueberry leads, joined by other sweet fruits for a round, inviting fragrance. Underneath, herbal undertones and a touch of pine add depth and keep the profile from becoming overly sweet.
The high opens with a gentle, uplifting lift that brightens the mood. As it settles, the indica genetics take over with a heavy wave of physical relaxation that loosens the body. Royal Queen Seeds lists sleepy among her effects, so she suits late evenings.
She is a great choice for winding down after a long day, enjoying a slow evening at home, or simply savoring a rich, fruity smoke.
Growing Granddaddy Purple Auto Seeds
Granddaddy Purple Auto is an easygoing plant that performs well in soil or hydro. Indoors, she can yield 13 to 16 oz/m² (370–450 g/m²). Gentle LST spreads her branches for better light coverage, and light defoliation helps air move through her dense colas.
Outdoors, each plant can produce 4 to 5 oz (110–140 g). She thrives in regions with long, warm summers and does well in containers or directly in the ground.
Plant seeds directly into their final pots, feed moderately, and watch for humidity late in flowering. Her thick buds will reward a careful dry and cure with a deep, fruity flavor.
Granddaddy Purple Auto Characteristics
| Strain type | Autoflowering (feminized) |
| Genetics | Granddaddy Purple x Big Bud Auto |
| Indica/Sativa | 75% Indica / 20% Sativa / 5% Ruderalis |
| THC | Up to 19% |
| CBD | Low |
| Effect | Physically Relaxing, Sleepy, Uplifting |
| Flavor | Blueberry, Fruity, Herbal, Pine |
| Indoor yield | 13 to 16 oz/m² (370–450 g/m²) |
| Outdoor yield | 4 to 5 oz/plant (110–140 g/plant) |
| Flowering time | 55–60 days (about 8 to 8.5 weeks) |
| Seed to harvest | 70–85 days (about 10 to 12 weeks) from germination |
| Height | Indoors 2 to 4 feet (60–120 cm); outdoors 3 to 5 feet (90–150 cm) |
| Climate | Thrives in regions with long, warm summers |
| Best cultivation technique | LST and light defoliation |
FAQ
What are the parents of Granddaddy Purple Auto?
Royal Queen Seeds crossed Granddaddy Purple with Big Bud Auto. Granddaddy Purple itself traces back to Purple Urkle.
How long does Granddaddy Purple Auto take to grow?
She is ready about 70–85 days after germination, roughly 10 to 12 weeks, with a flowering phase of about 55–60 days.
How strong is Granddaddy Purple Auto?
Royal Queen Seeds lists THC at up to 19% with low CBD.
What does Granddaddy Purple Auto taste like?
Expect juicy blueberry and mixed fruit with herbal undertones and a hint of pine.
Does Granddaddy Purple Auto need a light schedule change?
No. As an autoflower, she flowers on her own. Most growers run 18/6 or 20/4 from seed to harvest.
What yield does Granddaddy Purple Auto produce?
Indoors, expect 13 to 16 oz/m² (370–450 g/m²). Outdoors, plants yield about 4 to 5 oz (110–140 g) each.
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