Auto Grand Daddy Purple – 00 Seeds · Sweet Grape Indica Auto · Fast & Relaxing

Auto Grand Daddy Purple by 00 Seeds is a fast-flowering, indica-dominant autoflowering strain that delivers the legendary sweet grape flavors and deep relaxation of the original GDP in a highly efficient format.

Starting a new autoflowering grow can often feel overwhelming when you are not entirely clear about the right steps, the exact timing, or the specific needs of a fast-paced indica hybrid. You might find yourself second-guessing every watering schedule or nutrient dose, wondering if you are doing things in the correct order to maximize your yield and get that perfect chill vibe.

This lack of a clear roadmap usually leads to unnecessary stress, stunted plants during the crucial vegetative stage, and ultimately, a disappointing harvest that makes you think the genetics are to blame. In reality, the problem isn't the seed, but the absence of a structured, easy-to-follow process that respects the rapid life cycle of an autoflower. Nobody wants to end up with popcorn buds when they were dreaming of fat, purple colas.

With Auto Grand Daddy Purple, you get a resilient and forgiving strain that thrives when paired with a straightforward, phase-based growing path. By following a clear sequence from germination to harvest, you can unlock its full potential, ensuring dense, purple-hued buds without the guesswork. It’s time to grow smart and roll up some top-tier stash.

Why Auto Grand Daddy Purple is a Must-Have

• Feature: 70 to 80-day complete life cycle. Advantage: It grows incredibly fast from seed to harvest. Benefit: You save time and can enjoy your homegrown, sweet grape stash much sooner, allowing for multiple harvests per year.
• Feature: Indica-dominant genetics with 18–20% THC. Advantage: Delivers a potent, physically relaxing effect. Benefit: Perfect for unwinding after a long day, helping you chill out and disconnect from daily stress.
• Feature: Compact indoor height of 70–90 cm (27.56–35.43 in). Advantage: Fits easily into small grow tents or discreet spaces. Benefit: You can maintain a stealthy, manageable grow without worrying about plants outgrowing your setup.

Technical specifications

• Breeder: 00 Seeds
• Type: Autoflowering feminized
• Dominance: Indica dominant
• Genetics: Grand Daddy Purple x Ruderalis
• Cycle: 70–80 days approx. (germination to harvest)
• Yield Indoor: 400–500 g/m² (1.31–1.64 oz/ft²)
• Yield Outdoor: 100–150 g/plant (3.53–5.29 oz/plant)
• Height Indoor: 70–90 cm (27.56–35.43 in)
• Height Outdoor: 0.90–1.20 m (2.95–3.94 ft)
• Difficulty: Low
• Recommended pot: 18–27 L final pot early
• THC: 18–20% approx.
• CBD: 0–1% approx.
• Flavor: Sweet grape, berries, earthy undertones
• Effect: Deeply relaxing, physical, euphoric head high

Advice on how to grow the seed

Quick overview: Auto · 00 Seeds · 70–80 days cycle approx. · ideal for compact indoor spaces.

• Exploit its high resistance to common pests.
• Grow it in temperate or Mediterranean climates.
• Keep maintenance and feeding schedules minimal.

Safe start: Germinate at 22–25 °C; transplant to the final pot early. For explosive rooting, Bactomatik Rex by Agrobacterias speeds up establishment.

• Use an 18–27 L final pot immediately.
• Keep seedling humidity around 60–70%.
• Avoid overwatering the young taproot.

Directed growth: Provide 18–20 h of light; use a light, airy substrate. Solo Tek Grow - Grotek keeps vigor high without excess nitrogen.

• Maintain temperatures between 22–26 °C.
• Avoid aggressive pruning or topping.
• Use gentle LST to open the canopy.

Efficient flowering: Keep RH at 40–50% and ensure good ventilation; add BAC Organic Bloom NPK 6-5-6 for denser, sweeter purple buds.

• Lower temperatures slightly to enhance purple hues.
• Watch for dense bud moisture buildup.
• Increase PK nutrients progressively.

Harvest and refinement: Wait for milky to amber trichomes depending on the desired physical effect; flush 7–10 days before.

• Dry slowly at 18–22 °C and 50–60% RH.
• Cure in glass jars for 2–4 weeks.
• Burp jars daily during the first week.

Advantages of following this flow instead of improvising

• More consistency: You know exactly what to expect at each stage of the plant's rapid life cycle, keeping your grow room totally zen.
• Fewer silly mistakes: Avoiding unnecessary transplants or aggressive pruning saves your autoflower from fatal stress and keeps the yields high.
• More control over results: Dialing in the environment and nutrients leads to denser, more resinous buds that look like they belong on a magazine cover.
• Feeling of mastering the process: You transition from guessing to confidently guiding your plant to a successful harvest, like a true cannabis boss.

Frequently Asked Questions

How long does Auto Grand Daddy Purple take from seed to harvest?

This strain is incredibly fast, typically completing its entire life cycle in just 70 to 80 days from germination, making it perfect for impatient growers or short outdoor seasons.

Can I top or prune this autoflower?

It is highly recommended to avoid aggressive pruning techniques like topping or FIMming. Because of its short vegetative phase, the plant won't have time to recover. Instead, use Low Stress Training (LST) to gently bend branches and improve light penetration.

How do I bring out the purple colors in the buds?

While the genetics naturally lean towards purple hues, you can encourage these colors by slightly lowering the nighttime temperatures in your grow room during the late flowering stage, aiming for around 18–20 °C.

Personal Experience of Pevgrow’s CEO (Alan)

When I first popped a few Auto Grand Daddy Purple seeds, I treated them like standard photoperiods, which was my first mistake. I transplanted them twice, and the stress cost me a good chunk of my yield. Once I realized that these fast-paced autos need to go straight into their final 18-liter pots, everything changed. I started organizing my grow into strict phases: a gentle start with root stimulators, a hands-off vegetative stage with just some light LST, and a heavy focus on PK boosters during flowering.

The results were night and day. By following a structured plan, the plants exploded with vigor, and the buds developed those iconic, deep purple colors GDP is famous for. The aroma in the tent was an intoxicating mix of sweet grapes and earthy berries. If you want to get the most out of this strain, my biggest piece of advice is to keep it simple, avoid stressing the plant, and let the genetics do the heavy lifting. It’s an incredibly rewarding smoke for winding down after a long day.