Green House Seed Co

A.M.S. Seeds

Feminized Seeds

Various Quantities

Price range: $40.00 through $70.00

Pack Size (Green House Seed Co)

Clear

A.M.S. feminized cannabis seeds by Green House Seed Co, Swiss sativa x Swiss indica, 5-pack

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

A.M.S. feminized cannabis seeds by Green House Seed Co. Anti Mold Strain, and a nod to Amsterdam: two old-school Swiss lines bred into Green House's toughest outdoor plant, with a mossy forest aroma and ripe red-fruit sweetness. Sold as feminized seeds in 5-packs and 10-packs.

Grow specs

Genotype	Indica Dominant (40% sativa / 60% indica)
Genetics	Swiss sativa x Swiss indica
Seed type	Feminized, photoperiod
Flowering time (indoor)	8 to 9 weeks (9 for maximum resin, 8 for commercial harvest)
Indoor yield	Up to 700 g/m²
Outdoor harvest	End of September (Northern Hemisphere)
Outdoor yield	Up to 800 g per plant
Structure	Tall, robust plant with short-stretching nodes and strong stems; dense, compact, sticky flowers; very mold-resistant, ideal for humid areas

About A.M.S.

A.M.S. is one of the classic outdoor plants in the Green House catalog, and the name says what it is for: Anti Mold Strain, with a wink at Amsterdam. It descends from two old Swiss strains a friend gave Arjan, a sativa and an indica, and it earned its reputation through extreme resistance to pests and fungus in wet, cool conditions. Green House has used it as a parent for Damnesia, Jack's Dream and Ztrawberry.

The plant is tall but disciplined: nodes that do not stretch much, strong stems that carry heavy late-season flowers, and dark green foliage that blends into other plants, which Green House notes makes it good for discreet grows. The flowers are dense, compact and sticky, and the smell builds to a heavy overripe red-fruit note by the end of flowering.

How it grows

Indoors it flowers in 8 to 9 weeks: 9 delivers the most resin, commercial growers take it at 8. Green House rates the yield at up to 700 g/m².

Outdoors it finishes at the end of September in the Northern Hemisphere with up to 800 g per plant, and it is the strain to reach for in humid climates.

Flavor, aroma and effect

Mossy, forest-floor aroma with ripe red fruit like old jam, and a sweet, complex taste. The effect is strong with two sides, one clear and one more introspective.

Who it is for

Outdoor growers in damp or cool climates, and anyone who wants a stealthy, low-drama plant that still tastes like something.

Seed type and pack options

A.M.S. 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. 🌱