HighCloudZ Auto Seeds
Autoflower Seeds
Various Quantities
Price range: $66.00 through $110.00
HighCloudZ x Watermelon Auto. Indica Dominant, 40% sativa / 50% indica / 10% ruderalis. Autoflowering seeds by Green House Seed Co.
HighCloudZ Auto autoflower cannabis seeds by Green House Seed Co. The autoflowering HighCloudZ, crossed to a Watermelon auto: the same candy-sweet, energetic-then-heavy profile, and a third-place finish at the 2024 Autoflower World Cup. Sold as autoflower seeds in 5-packs and 10-packs.
Grow specs
| Genotype | Indica Dominant (40% sativa / 50% indica / 10% ruderalis) |
|---|---|
| Genetics | HighCloudZ x Watermelon Auto |
| Seed type | Autoflowering |
| Flowering time (indoor) | 9 to 10 weeks |
| Indoor yield | High |
| Outdoor harvest | 10 weeks of flowering outdoors |
| Outdoor yield | Up to 140 g per plant at about 160 cm |
| Structure | Tall auto with a long main cola and strong secondary branches; very compact flowers with big calyxes |
| Awards | 3rd place, Autoflower World Cup 2024 (Bread and Buds) |
About HighCloudZ Auto
HighCloudZ Auto takes Green House's HighCloudZ, itself WatermelonZ x Cloud Walker, and crosses it to a Watermelon autoflower. The result keeps the uplifting sativa high and the sweet, sour, heavy Watermelon character while flowering on its own schedule. It placed third at the 2024 Autoflower World Cup organized by Bread and Buds.
Like the photoperiod version it grows a long main cola surrounded by strong secondary branches that push toward the top, forming a healthy canopy. At around 160 cm it is one of the taller autos Green House sells, and the flowers finish very compact with big calyxes.
How it grows
Indoors it flowers in 9 to 10 weeks with a high yield; give it vertical room.
Outdoors it finishes in about 10 weeks of flowering with up to 140 g per plant at about 160 cm.
Flavor, aroma and effect
Extremely sweet, with the pineapple-and-grape side of Cloud Walker and the deep candy sweetness of WatermelonZ. Energetic and uplifting at first, then a warm, relaxing body effect.
Who it is for
Auto growers with height to spare who want a competition-placed strain with real yield.
Seed type and pack options
HighCloudZ Auto is sold by Green House Seed Co as autoflowering 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. 🌱
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