Green House Seed Co

White Widow Seeds

Feminized Seeds

Various Quantities

Price range: $45.00 through $78.00

Pack Size (Green House Seed Co)

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White Widow feminized cannabis seeds by Green House Seed Co, Brazilian x South Indian, 5-pack

Brazilian x South Indian. Indica Dominant, 40% sativa / 60% indica. Feminized seeds by Green House Seed Co.

White Widow feminized cannabis seeds by Green House Seed Co. The Amsterdam classic of the 1990s: a Brazilian sativa mother crossed with a South Indian indica father, bred and stabilized by Green House Seed Co. Sold as feminized seeds in 5-packs and 10-packs.

Grow specs

Genotype	Indica Dominant (40% sativa / 60% indica)
Genetics	Brazilian sativa x South Indian indica
Seed type	Feminized, photoperiod
Flowering time (indoor)	8 weeks
Indoor yield	Up to 800 g/m²
Outdoor harvest	End of September (Northern Hemisphere)
Outdoor yield	Up to 900 g per plant
Structure	Medium plant, very good for ScrOG; prefers mild, temperate climates outdoors
Awards	1st place, High Times Cannabis Cup 1995 (bio)

About White Widow

White Widow took its name from the thick layer of white resin that covers ripe buds, and it went on to win the bio category at the 1995 High Times Cannabis Cup. Thirty years later it is still the reference point for resin production in a photoperiod plant.

The 60/40 indica lean shows in the compact bud structure and the relaxed start of the effect, but the Brazilian sativa side is what keeps it interesting: a lively, sociable high that arrives quickly and lasts.

How it grows

Indoors, White Widow finishes in about 8 weeks of flowering and Green House rates the yield at up to 800 g/m². It responds especially well to a screen of green, filling the net with even, medium-sized colas that are easy to trim.

Outdoors in the Northern Hemisphere it is ready at the end of September with up to 900 g per plant. It prefers mild, temperate conditions over extreme heat or humidity.

Flavor, aroma and effect

Sweet and earthy with a piney, faintly floral edge. The effect is fast and layered: a relaxed, physical start that opens into an energetic, talkative high and holds for a long time.

Who it is for

Growers who want a dependable, heavily documented classic with serious resin, and anyone setting up a first screen of green.

Seed type and pack options

White Widow is sold by Green House Seed Co as feminized photoperiod seeds in 5-seed and 10-seed packs.

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. 🌱