Best Auto Hybrid Winner 2025: Sundae Thumper by Mephisto Genetics

When it comes to autos that blur the line between flavor and performance, Sundae Thumper by Mephisto Genetics sits comfortably in that sweet spot - literally. Grown by longtime cultivator Jimbo, this candy-driven hybrid stole the judges’ attention and claimed 1st Place for Best Auto Hybrid at the 2025 American Autoflower Cup, proving once again that Mephisto’s craft is setting standards.

This win extends Mephisto’s impressive track record. After being voted Best Autoflower Breeder by the community in both 2023 and 2024, the UK originary team entered 2025 with a clear goal - to keep evolving what autoflowers can be. 

Growers across Reddit, forums, and Discord agree — this is a strain that smells as good as it looks. Grow journals describe “super fast finisher, very oily buds,” and “a syrupy sweetness that hits like peach candy.” One grower called it “an easy cultivar with ridiculous bag appeal — dense, purple, sticky, and loud.”

How Jimbo Grew a Winner

For Jimbo, who’s been part of the Mephisto team since 2022, Sundae Thumper was more than a test run - it was a strategic entry.

“The judges in 2024 seemed to love bold, candy-like terpene profiles,” he said. “Sundae Thumper delivers exactly that.” He grew his winning plant in a 5-gallon fabric pot filled with Biobizz Light Mix, under 24 hours of light from a 300 W bar-style LED, using Biobizz nutrients at one-third strength and a no-waste watering system with recycled dehumidifier runoff. 

“Autoflowers are here to stay,” Jimbo added. “You can skip the mother tents, clones, and pheno hunts - in less than 90 days you’re harvesting jars of top-shelf smoke. That’s the power of autos.”

Why This Win Matters

Sundae Thumper’s victory wasn’t just a personal achievement - it marked another moment in the autoflower renaissance. Once dismissed as a novelty, autos like this now stand as proof that speed and quality can coexist in the same jar. Mephisto’s breeding philosophy - focused on organic methods, community collaboration, and meticulous selection - has made them a fixture on competition stages around the world.

With multiple international awards and a growing community of dedicated growers, Mephisto Genetics continues to demonstrate that autos aren’t just catching up - they’re leading the charge.

As the industry heads toward the 2026 American Autoflower Cup in Los Angeles on January 31st, one thing is clear: Sundae Thumper set the standard for what a hybrid auto can be - rich, refined, and ready to redefine expectations. 

Curious about the scores in the former editions? Head to our website and discover who ran the podium!