Big Devil XL Auto Seeds
Autoflower Seeds
Various Quantities
Price range: $30.00 through $48.75
3 free Buds & Roses seeds in orders $75+, a full 6-pack at $175+. Want a certain strain? Add it to your order notes (not guaranteed).
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Big Devil #2 Auto x Jack Herer (automatic). Sativa Dominant. Autoflowering feminized seeds by Sweet Seeds.
Big Devil XL autoflowering cannabis seeds by Sweet Seeds. A sativa-dominant autoflower from Big Devil #2 Auto and an automatic Jack Herer. It grows to a medium height, finishes in about 8 to 10 weeks from seed, and is rated very high for indoor yield. Sold in 3 and 5-seed packs.
Grow specs
| Genotype | Sativa Dominant |
|---|---|
| Genetics | Big Devil #2 Auto x Jack Herer (automatic) |
| Seed type | Feminized, autoflowering |
| Seed to harvest | 8 to 10 weeks |
| Indoor yield | Very high (above 600 g/m²) |
| Outdoor yield | Average (200 to 450 g per plant) |
| THC | High (16 to 24%) |
| CBD | Low (0 to 1%) |
| Plant height | Medium |
| Flavor | Minty, spicy |
About Big Devil XL Auto
Big Devil XL Auto is one of Sweet Seeds’ third-generation automatic strains. It crosses Big Devil #2 Auto with an automatic Jack Herer, and it keeps a sativa-dominant character while still finishing on an autoflower schedule.
THC is high, in the 16 to 24% range, and CBD is low at 0 to 1%. The main selling points are size and yield: this is a medium-height autoflower, taller than the short ones in the range, with an indoor yield rated very high at above 600 g/m², so it rewards a well-prepared tent.
How it grows
Big Devil XL Auto reaches a medium height, so it has more room to stretch than most autoflowers and benefits from a little training to keep the canopy even. It flowers automatically, with no change in the light cycle, and goes from seed to harvest in about 8 to 10 weeks.
Indoors, the yield rating is very high, above 600 g/m². Outdoors, the rating is average, at 200 to 450 g per plant. It is a strong match for growers who want to push autoflower yields.
Flavor, aroma and effect
Minty and spicy. The cool, fresh mint note comes through first, followed by a warm spice that adds depth and a bit of bite. It is a sharp, clean profile that stands apart from the sweeter or skunkier autoflowers, and it keeps its character well through a careful dry and cure.
Who it is for
Suited to growers who want more from an autoflower: a bigger plant, a bigger indoor yield and a sativa-leaning profile. It rewards tent growers who can give it a little extra height, and it appeals to gardeners ready to try light training.
Pack options
Big Devil XL Auto Seeds from Sweet Seeds come in 2 pack sizes: 3 seeds ($40) and 5 seeds ($65). Every seed is feminized and autoflowering, so each one grows into a female plant that flowers on its own schedule without a change in the light cycle.
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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