Grand Daddy Purple Feminized Seeds by 00 Seeds · Indica-Dominant Purple Strain with Berry Aroma

Grand Daddy Purple feminized seeds by 00 Seeds grow into one of the most iconic indica-dominant strains worldwide, famous for their vibrant purple hues, intense grape-like aroma, and deeply relaxing effects that melt away stress and discomfort.

Worried your first grow won’t live up to the legend? You’ve heard how amazing Grand Daddy Purple can be — but what if you don’t get those rich purple buds or that smooth, fruity smoke everyone raves about? It’s easy to feel intimidated by a strain with such a big reputation. The truth is, many growers hesitate, sticking to basics and never unlocking the full potential of their garden.

With Grand Daddy Purple, you’re not just planting seeds — you’re starting a journey into one of the most celebrated cannabis lineages in history. This isn’t just another purple strain; it’s a precision-bred feminized version of a legendary American hybrid, designed to deliver consistent, high-quality results without the guesswork. From the first sprout to harvest, every step is an invitation to grow something truly special.

What to Expect in Your First Few Weeks

When you start with Grand Daddy Purple, expect a strong, bushy plant with short internodes and rapid root development. The seedlings show early signs of purple pigmentation under cool nighttime temperatures, especially during the late vegetative stage. Don’t be surprised if the aroma kicks in early — a sweet, earthy scent with berry notes often emerges by week 3. This strain doesn’t rush, but it builds solid structure fast, preparing for a heavy flowering phase.

Common Mistakes and How to Avoid Them

• Overwatering young plants — wait until the top layer of soil is dry before watering again.
• Ignoring humidity control — keep RH at 50–60% during veg to prevent mold.
• Pruning too aggressively — this strain focuses energy on main colas, so limit defoliation.
• Harvesting too early — wait for amber trichomes to maximize relaxation.
• Using nutrient-heavy soil — Grand Daddy Purple prefers a light mix to avoid nutrient burn.

How to Fine-Tune for Maximum Flavor and Potency

1. Start with a 3–4 week vegetative phase indoors to build a strong base.
2. Switch to flowering under 12/12 light to trigger bud development.
3. Lower nighttime temps to 18 °C (64.4 °F) during flowering to enhance purple anthocyanin expression.
4. Use a bloom fertilizer with high PK, like Bud Ignitor Advanced Nutrients, during peak flowering.
5. Flush with plain water 7–10 days before harvest to improve taste.
6. Monitor trichomes: harvest when 70% are milky and 30% amber for balanced effects.
7. Cure buds slowly in glass jars at 18–20 °C (64.4–68 °F) and 58–62% RH for 3–4 weeks.

Advantages of Mastering This Strain

• Consistent yields of 550–600 g/m² (19.4–21.2 oz/ft²) indoors.
• High THC levels (18–22%) deliver strong, soothing effects.
• Distinct grape and wild berry flavor perfect for extracts like rosin.
• Compact, mold-resistant structure ideal for indoor and stealth grows.
• Therapeutic potential for stress, pain, and sleep support.

Technical specifications

• Breeder / Brand: 00 Seeds
• Type: Feminized
• Dominance: Mainly Indica
• Genetics / Cross: Purple Urkle × Big Bud
• Flowering (Photoperiod): 8–10 weeks
• Outdoor Harvest (Northern Hemisphere): Early October
• Outdoor Harvest (Southern Hemisphere): Early April
• Indoor Yield: 550–600 g/m² (19.4–21.2 oz/ft²)
• Outdoor Yield: 300–600 g/plant (10.6–21.2 oz/plant)
• Indoor Height: 70–90 cm (27.56–35.43 in)
• Outdoor Height: 1.50–2.00 m (4.92–6.56 ft)
• Difficulty: Low to medium
• Structure and Vigour: Compact, bushy, solid branching
• Ideal Climate: Temperate, Mediterranean
• Resistance: Moderate resistance to botrytis; avoid wet conditions
• Training: Suitable for LST and SCROG; avoid heavy pruning
• Recommended Substrate: Light Mix soil or well-aerated coco
• Light Cycle: 18/6 (veg), 12/12 (flowering)
• Temperature: 22–26 °C (71.6–78.8 °F) veg, 20–25 °C (68–77 °F) flowering
• Humidity: 60–70% seedling, 50–60% veg, 40–50% flowering
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• Smell in Grow: Medium to high — consider a carbon filter
• THC: 18–22%
• Aromatic Profile: Myrcene, caryophyllene, limonene
• Flavour: Grape, wild berries, earthy sweetness
• Effect: Relaxing body high with mild cerebral euphoria — ideal for nighttime use

How to Grow Grand Daddy Purple Seeds

Quick overview: feminized indica-dominant strain from 00 Seeds · 8–10 week flowering · low to medium difficulty · ideal for indoor and outdoor grows in temperate climates.

Safe start: germinate in a moist paper towel at 22–25 °C (71.6–77 °F). Transplant carefully when the taproot reaches ~1 cm (0.4 in). For a hassle-free start, X-Seed organic vegan seed germinator | BAC boosts early root development.

Stable seedling: keep humidity at 60–70% and use gentle light. Water lightly and ensure good drainage. Consider adding Mykos Root Paks Mycorrhizae 10 gr to enhance nutrient uptake and resilience.

Directed growth: maintain 18/6 light cycle; use LST to spread the canopy. Opt for 11–20 L pots depending on space. Avoid overfeeding — this strain thrives on a light nutrient profile.

Flowering by stages: switch to 12/12 light; lower humidity to 40–50% in mid-flower. Support heavy colas with stakes. In sustained growth, Bud Ignitor Advanced Nutrients promotes dense, resin-rich buds.

Harvest, drying and curing: harvest when trichomes turn milky-amber. Dry at 18–20 °C (64.4–68 °F) and 55–60% RH for 10–14 days. Cure in jars for 3–4 weeks to enhance flavor and smoothness.

Frequently Asked Questions

How long does it take to grow Grand Daddy Purple?

From seed to harvest, expect 10–14 weeks indoors, including a 3–4 week vegetative phase and 8–10 weeks of flowering. Outdoor plants are ready in early October (northern hemisphere).

Why aren’t my buds turning purple?

Purple color develops under cooler nighttime temperatures (18–20 °C / 64.4–68 °F) during flowering. Genetics play a role too — ensure you’re growing a true phenotype.

Is Grand Daddy Purple good for beginners?

Yes, it’s beginner-friendly due to its resilience and compact growth, but requires attention to humidity and feeding to avoid mold and nutrient burn.

Can I grow this strain outdoors in a humid climate?

It can be grown outdoors, but avoid wet conditions. Use preventive fungicides and ensure excellent airflow to protect dense buds from botrytis.

Personal Experience of Pevgrow’s CEO (Alan)

When I first grew Grand Daddy Purple, I was obsessed with forcing the purple color — I dropped the temps too fast and shocked the plants. Big mistake. They stalled for a week. What changed everything was letting the plant lead: I backed off on nutrients, focused on root health with mycorrhizae, and waited until late flowering to cool the nights. The second grow? Dense, frosty buds with deep violet hues and a flavor that filled the room. The key wasn’t pushing harder — it was trusting the process. Now, I recommend it to anyone who wants a strain that’s forgiving but rewards attention to detail. It’s not just potent — it’s elegant.