Sweets XL Auto Seeds – Grand Cru Genetics · High Yield & 20% THC · Sweet Kush Autoflower

Sweets XL Auto by Grand Cru Genetics is a powerhouse autoflowering hybrid that delivers massive, resin-drenched yields and over 20% THC in just 85 days.

Jumping into an XL autoflower grow can feel overwhelming when you aren't sure how to maximize its extended vegetative window.

Without a clear roadmap, it is incredibly easy to stunt the plant early on, overfeed during the stretch, or harvest before those dense buds fully swell. These simple mistakes turn a potentially massive harvest into a frustratingly average yield, making you feel like the genetics just didn't deliver.

Sweets XL Auto eliminates the guesswork when you follow a structured, phase-based approach. By treating its 85-day cycle as a clear step-by-step journey, you unlock the true potential of its Gushers and Triangle Kush lineage, guaranteeing heavy, candy-scented colas.

Phase 1: Preparing the ground

Before popping your seeds, dial in your environment to give these XL genetics the perfect start. A solid foundation prevents stunting and sets the stage for explosive growth.

• Check your grow tent temperature and humidity levels.
• Prepare a light, airy soil mix with plenty of perlite.
• Select an 18–27 L final pot to avoid transplant shock.
• Ensure your LED lights are set to an 18/6 or 20/4 schedule.
• Calibrate your pH and EC meters for accurate feeding.

Phase 2: Setting up the product

Getting your Sweets XL Auto started correctly is crucial for maximizing its hybrid vigor.

1. Germinate seeds using the damp paper towel method.
2. Plant the sprouted taproot directly into the final pot.
3. Water lightly in a circle around the seedling to encourage root expansion.
4. Keep the light intensity low to prevent burning the delicate first leaves.

Phase 3: Use / growing step by step

Guide this beast through its 85-day cycle with precision.

1. Maintain 60-70% humidity during the first two weeks of seedling growth.
2. Introduce light vegetative nutrients once the third node appears.
3. Apply gentle Low Stress Training (LST) to open up the canopy.
4. Watch for pre-flowers around week 4 or 5, signaling the stretch.
5. Switch to bloom nutrients and lower humidity to 40-50%.
6. Support heavy branches as the Kush and candy-scented buds pack on weight.
7. Flush the substrate 10 days before harvest for the cleanest flavor.

Phase 4: Closing, maintenance and learnings

Once you chop your Sweets XL Auto, the work isn't quite over. Proper drying and curing are essential to lock in that mouthwatering Gushers terpene profile.

Hang the whole plant or large branches in a dark room at 20 °C and 50-60% humidity. Take notes on how the plant reacted to your feeding schedule to dial it in even better next time.

Advantages of following this flow instead of improvising

• Consistent growth: Avoiding transplants means zero recovery time, which translates to bigger plants.
• Maximized yields: Proper LST exposes lower sites to light, meaning heavier harvests.
• Premium flavor: Flushing correctly enhances the sweet candy and Kush terpenes.
• Stress-free process: Knowing exactly what to do at each stage gives you total peace of mind.

Technical specifications

• Breeder: Grand Cru Genetics
• Type: Feminized autoflowering
• Genetics: Sweets XL Auto BX1 (Gushers X Triangle Kush Auto)
• Dominance: Hybrid
• Total cycle: 85 days from germination
• Yield (Indoor): High, approx. 450–550 g/m² (1.48–1.80 oz/ft²)
• Yield (Outdoor): High, approx. 100–200 g/plant (3.53–7.05 oz/plant)
• Height (Indoor): 0.80–1.20 m (2.62–3.94 ft)
• Height (Outdoor): 1.00–1.50 m (3.28–4.92 ft)
• THC: >20%
• CBD: Low (approx. <1%)
• Aroma/Flavor: Kush, sweet candy
• Effect: Balanced, relaxing body high with a euphoric cerebral buzz

Sweets XL Auto Grow Guide

Quick overview: Auto hybrid · Grand Cru Genetics · 85 days approx. · Ideal for indoor tents.

Safe start: Germinate at 22–25 °C. Plant directly into the final pot. To secure explosive root development, Orca Liquid Mycorrhizae 946 ml is a game-changer.

• Keep humidity at 60–70%.
• Water sparingly around the edges.
• Maintain 18–20 hours of light.

Directed growth: Keep the substrate airy. Apply gentle LST to maximize light penetration.

• Avoid aggressive topping.
• Feed light vegetative nutrients.
• Keep temps around 22–26 °C.

Efficient flowering: Watch for the stretch around week 4. Lower humidity to 40–50% to prevent mold. For denser, heavier buds, add Big One Top Crop during peak bloom.

• Increase PK nutrients gradually.
• Ensure strong airflow.
• Support heavy branches.

Harvest and refinement: Check trichomes for desired ripeness. Flush thoroughly for the best candy flavor.

• Flush 7–10 days prior.
• Dry at 18–22 °C.
• Cure for 2–4 weeks.

Frequently Asked Questions

Does Sweets XL Auto need a different light schedule?

No, like most autoflowers, it thrives on a consistent 18/6 or 20/4 light cycle from seed to harvest. There is no need to switch to 12/12 to trigger flowering.

Can I top this strain?

Because it is an autoflower, topping is generally not recommended as it can stunt growth. Stick to Low Stress Training (LST) to increase your yield safely.

Why does it take 85 days?

The "XL" in its name means it has a slightly longer vegetative and flowering period than standard autos, allowing it to build a much larger structure and produce heavier yields.

Personal Experience of Pevgrow’s CEO (Alan)

When I first popped Sweets XL Auto, I treated it like a standard fast-finishing auto and underfed it during its extended veg phase. I quickly realized this beast needs a bit more runway! Now, I always use a 25 L (6.60 gal) fabric pot and let it stretch its legs. The Gushers lineage really shines through in the final weeks, pumping out this ridiculous candy-gas aroma that stinks up the whole room.

My biggest tip? Don't rush the harvest. Around day 75, it looks almost done, but if you wait the full 85 days, the calyxes swell massively and the resin production goes off the charts. I also highly recommend using a quality organic soil mix like BioBizz Light Mix 50L to really bring out those sweet Kush terpenes. It’s a phenomenal smoke for chilling out after a long day.