Grow Review · Humboldt Seed Company
Blueberry Muffin
Humboldt's most-awarded indica. An F9 double breeding line with 45-day flowering, near-zero phenotype variation, and the 2025 Grower's Choice Strain of the Year triple crown.
- Type
- Indica-dominant · 90/10
- Flowering
- 45-55 days
- Yield
- High
- Difficulty
- Beginner friendly
- Genetics
- Purple Panty Dropper × Razzle Berry
- Seed type
- Feminized photoperiod
Blueberry Muffin is the most-reviewed and most-awarded strain from Humboldt Seed Company. It is also the parent of Apple Blossom (Blueberry Muffin x Dream Queen) and Blueberry Cupcake, making it the genetic foundation of a large portion of Humboldt’s modern catalog. With a 45-day flowering window on the fast phenos and a 2025 Grower’s Choice triple crown (Strain of the Year, Best Photoperiod, Best Extract), it is one of the strongest picks for a speed-focused home grower.
Leafly reviewers have given it a 4.6-star average across 529 reviews. That is one of the larger sample sizes on the platform, which makes the aggregate data unusually reliable.
Genetics
The parents are Purple Panty Dropper x Razzle Berry. Leafly’s entry credits Humboldt Seed Company as the producer but lists the parents as Blueberry x Purple Panty Dropper. The discrepancy likely reflects simplified naming on the Leafly side, since Razzle Berry is itself a Blueberry descendant. Both sources agree on Humboldt as the breeder.
The key detail is the F9 double breeding line. This is extraordinarily rare in commercial cannabis. Most strains on the market are F1 (first-generation hybrid), S1 (selfed), or Bx (backcross). An F9 means Humboldt has selected and stabilized this line through nine generations of controlled breeding. The practical result for growers: every seed in a pack will produce a plant that looks, grows, and smells nearly identical to every other seed in the pack. There is almost no phenotype variation to account for.
Blueberry Muffin has itself become a breeding cornerstone. Leafly lists Blueberry Cupcake (Wedding Cake x Blueberry Muffin) and Squirt as direct descendants. Humboldt’s Apple Blossom (Blueberry Muffin x Dream Queen), which we cover in a separate review, is another.
Flowering time and grow notes
Flowering takes 45 to 55 days indoors, with outdoor harvest in mid to late September. That is a fast window for an indica-dominant plant. The F9 stability means the variation between the fast and slow end of that range should be minimal across seeds.
A grow report from u/Emotional-Pattern-20 on r/gardening documents a single Blueberry Muffin at six weeks from flip with 90% cloudy trichomes and no amber. The grower noted the plant was “still bright green with no fade,” suggesting the strain holds color late into flower rather than fading early. Commenters in the thread recommended watching for 5 to 10% amber before chopping. That would put the realistic finish at roughly 45 to 50 days from flip.
Blueberry Muffin is beginner-friendly, pest-resistant, and tagged as both early finishing and high yield. Feeding should follow standard indica practices. The F9 stability means you can dial in a feeding schedule on the first plant and expect every subsequent plant in the pack to respond the same way.
Terpene profile and aroma
The terpene profile is led by caryophyllene (the warm, peppery note), with myrcene (earthy, sedating) and limonene (bright citrus) in support. This combination produces the bakery-forward nose the strain is known for: a warm, sweet blueberry-muffin scent with butter, vanilla, and chamomile undertones.
Across 529 Leafly reviews, the most frequently reported flavors are butter, blueberry, and vanilla. The butter note is the caryophyllene expressing as warmth rather than spice. The blueberry is the strain’s signature. The vanilla rounds out the bakery profile.
The aroma is reportedly strong in the tent and survives the cure well. The Reddit grower u/Emotional-Pattern-20 commented: “The aroma that plant is producing literally blows my mind. Blueberry muffin is a perfect name for her.”
Effects
Community reviewers most frequently report the effects as relaxed, tingly, and happy, with euphoric and giggly as secondary notes. The 90% indica-dominant genetics come through clearly. This is an evening plant, not a daytime sativa.
Median THC across community lab data is approximately 20%, with a small but notable 1% CBG (cannabigerol). The CBG presence is consistent with other indica-dominant hybrids that show elevated CBG on Leafly and may contribute to the calming profile.
The most common side effect is dry mouth (17% of reviewers), followed by dizziness (4%) and headache (2%). None of these are unusual for a 20% THC indica.
Medical cannabis users on Leafly most frequently reach for Blueberry Muffin for anxiety (33%), stress (27%), and depression (27%). The relaxed, happy profile without heavy couch-lock makes it a versatile medical option.
What other growers say
I have a single BBM from HSC and it’s coming up on 6 weeks. Advertised harvest time is 6-8 weeks. I checked the trichrome development this morning and id say 90% are cloudy but no amber yet. Plant still is bright green and has no fade! – u/Emotional-Pattern-20, r/gardening
Could quite possibly be my favorite strain I’ve grown so far. Potent, fragrant and fairly pest resistant compared to other cultivars I grew last year. – u/?, r/farmingthebestgreens
Both reports line up with the data: fast flower, strong terps, pest-resistant, and forgiving. The second grower grew from bag seed outdoors and still had a positive experience, which says something about the stability of the genetics.
You might also like
- Apple Blossom, if you want the Blueberry Muffin genetics in a faster, higher-yielding package. Apple Blossom is Blueberry Muffin x Dream Queen and finishes in 45 days with bigger yields.
- Dream Queen, if you want a sativa-dominant daytime alternative at the same 45-day speed. Different effect profile (energetic, uplifting) but the same Humboldt speed.
- Dirty Mimosa, if you want a sativa-dominant option from a different breeder. 49 to 56 days, compact structure, award-winning terps from Dirty Bird Genetics.
Where to buy Blueberry Muffin seeds
Blueberry Muffin is available from North Atlantic Seed Company in 3, 5, and 10-seed packs of feminized photoperiod seeds, priced from $45 to $120.
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