Granddaddy Purple Seeds

Feminized Seeds

Various Quantities

Price range: $14.50 through $102.00

Pack Size (Royal Queen Seeds)

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Granddaddy Purple Seeds by Royal Queen Seeds

Purple Urkle x Big Bud. Indica Dominant. Feminized seeds by Royal Queen Seeds.

Granddaddy Purple feminized cannabis seeds by Royal Queen Seeds. An indica-dominant cross of Purple Urkle and Big Bud, it flowers in 8 to 10 weeks and brings a fruity, piney taste along with high yield ratings. Available as single seeds and in 3, 5 and 10-seed packs.

Grow specs

Genotype	Indica Dominant
Genetics	Purple Urkle x Big Bud
Seed type	Feminized, photoperiod
Flowering time (indoor)	8 to 10 weeks
Indoor yield	High (450 to 600 g/m²)
Outdoor yield	High (450 to 750 g per plant)
THC	High (16 to 24%)
CBD	Low (0 to 1%)
Plant height	Medium
Flavor	Fruity, piney

About Granddaddy Purple

Granddaddy Purple combines Purple Urkle with Big Bud. Royal Queen Seeds lists the strain as indica dominant, and its THC is rated high at 16 to 24%, with CBD low at 0 to 1%.

This is the feminized photoperiod version, so the seeds are bred to grow into female plants and you control when bloom begins.

How it grows

Indoors, plan on about 8 to 10 weeks of flowering after the switch to 12/12. The plant reaches medium height, keeping it practical for tents and grow rooms of ordinary size. Outdoors, it flowers as days shorten and finishes toward the end of the season.

The yield rating is high: 450 to 600 grams per square meter indoors and 450 to 750 grams per plant outdoors. Training the main stem early and keeping humidity in check during late flower will help you bring in a clean, full harvest.

Flavor, aroma and effect

Royal Queen Seeds describes the taste as fruity with a piney edge. The indica-dominant genetics point toward a calm, body-focused experience rather than a stimulating one.

Who it is for

Granddaddy Purple suits growers who want an indica-leaning photoperiod with dependable yields and a standard flowering window. Beginners with a basic tent can manage it, and outdoor growers with a long enough season can let it grow out into bigger plants. Anyone who enjoys fruity, pine-tinged flavor should take a look.

Pack options

Granddaddy Purple Seeds from Royal Queen Seeds come in 4 pack sizes: single seed ($14.50), 3 seeds ($37), 5 seeds ($56) and 10 seeds ($102). Every seed is feminized, so each one grows into a flowering female plant.

Seed Germination Instructions

for cannabis seeds

Step 1: Soak the seeds

Fill a glass with clean, room-temperature water (68-77°F / 20-25°C).
Use filtered, dechlorinated, or pH-balanced water to prevent contaminants.
Drop the seeds into the water and gently swirl to ensure full submersion.
If seeds float, tap them down lightly or leave them to absorb water.
Optional: Add 3% hydrogen peroxide (H₂O₂) at a ratio of 1 ml per 100 ml of water to prevent mold and bacteria.
Place the glass in a dark, warm location for 2-6 hours (do not exceed 12 hours to prevent drowning).

Step 2: Prepare the Germination Plate

Dampen two layers of paper towel, cotton, or thick toilet paper with clean, dechlorinated water.
If using toilet paper, fold multiple plies to ensure adequate thickness.
Place seeds evenly between the layers, ensuring they do not touch each other.
Towels should be moist but not soaking wet.
Set the damp towel on a plate and cover with another plate or place it inside a resealable plastic bag to retain moisture.
Store in a dark, warm location (70-78°F / 21-26°C) such as a drawer or cabinet.
Check the moisture level every 6-12 hours and add water as needed to prevent drying.
Expected Germination Time:
- Most seeds crack open within 48-72 hours.
- Some may take 5-6 days to show taproots.
- Older seeds or seeds with a tougher shell may take up to 10-15 days to sprout.
- If a seed has not sprouted within 10 days, gently check it for signs of swelling or softening.

Step 3: Monitor Germination

Seeds typically crack open and develop a taproot within 48-72 hours, but some may take up to 5-6 days.
Older or dormant seeds may take 10-15 days to sprout, especially if they have a thicker shell.
Check regularly for signs of mold or fungal growth.
If mold appears, replace the paper towel and rinse seeds in a diluted hydrogen peroxide solution (1 ml of 3% H₂O₂ per 100 ml water).
The seed is ready for planting when the white taproot emerges and reaches ¼-½ inch (0.6-1.3 cm).

Step 4: Planting the Seeds

Prepare a pH-balanced growing medium (pH 5.5-6.0) such as:
- Quality soil-perlite mix
- Coco coir with perlite
- Rockwool cubes (must be pre-soaked in pH 5.5 water)
Plant the seed 2-5 mm deep, with the root tip facing downward.
Use containers that are at least 10 cm (4 inches) deep with drainage holes for healthy root development.
Lightly cover the seed with soil—do not press down too hard.
Spray the top layer with water instead of drenching it.

Step 5: Initial Care for Seedlings

Keep the growing medium moist but not waterlogged—spray with a spray bottle instead of overwatering.
Maintain high humidity by:
- Covering containers with clear plastic wrap or a humidity dome.
- Ensuring there is some airflow to prevent mold buildup.
Place seedlings under cold white LED or fluorescent lights or in indirect sunlight at 68-77°F (20-25°C).

Step 6: Gradual Exposure to Light

Once seedlings emerge and develop their first set of leaves (cotyledons):
- Slowly introduce them to stronger light sources.
- Start with low-intensity LED, CFL, or indirect sunlight, then gradually increase exposure.
Keep grow lights at a safe distance:
- LEDs: 12-24 inches (30-60 cm) above seedlings.
- HPS/MH: 24-36 inches (60-90 cm) above seedlings.
If transitioning to outdoor sunlight:
- Harden seedlings off gradually by placing them outside for short periods each day.

Additional Tips

Use filtered rainwater, bottled water, or dechlorinated tap water.
Maintain humidity levels between 70-80% for optimal germination.
Avoid handling the taproot directly, as it is delicate and can be easily damaged.
If using rockwool cubes, pre-soak them in pH 5.5 water before planting.
Germination rates depend on strain genetics, seed age, and storage conditions.
Seeds may take longer to sprout if conditions are too dry, cold, or hot.
Failure to follow these steps may reduce germination success and replacements are unlikely.
By following these steps, you’ll achieve healthy, vigorous cannabis seedlings ready for strong growth. 🌱