Grow Review · Humboldt Seed Company

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 in the Humboldt Seed Company lineup. It is also the parent of Apple Blossom 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, an F9 double breeding line that delivers near-zero phenotype variation, and a 2025 NASC Grower’s Choice triple crown (Strain of the Year, Best Photoperiod, Best Extract), it is one of the strongest all-around picks for a speed-focused home grower.

Leafly reviewers have given it a 4.6-star average across 529 reviews, which is one of the larger sample sizes on the platform and makes the aggregate data unusually reliable.

Genetics

NASC lists the genetics as Purple Panty Dropper x Razzle Berry. Leafly’s entry, which also credits Humboldt Seed Company as the producer, lists the parents as Blueberry x Purple Panty Dropper. The discrepancy likely reflects simplified or alternative naming on the Leafly side, since Razzle Berry is itself a Blueberry descendant. Both sources agree on Humboldt as the breeder.

The critical detail is the generation designation: 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 consequence for growers is that 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

Humboldt and NASC list flowering at 45-55 days indoor, with outdoor harvest in mid to late September. That’s a fast window for an indica-dominant plant, and 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 HSC 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 5-10% amber before chopping, which would put the realistic finish at roughly 45-50 days from flip for experienced growers watching trichome development.

NASC tags this strain in multiple curated categories: Cannabis Seeds for Beginners, Disease and Pest Resistant, Early Finishing, Cannabis Seeds for Extractions, High Test, High Yield, Outdoor, and Staff Selections. That breadth of category placement is unusual and reflects how versatile the plant is across different growing setups.

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 that multiple community reviewers describe as one of the most accurate strain-name-to-aroma matches in commercial cannabis.

Community flavor reports across 529 reviews most frequently describe butter, blueberry, and vanilla as the top three flavors. The butter note is the caryophyllene expressing as warmth rather than spice, the blueberry is the strain’s signature, and the vanilla rounds out the bakery profile. NASC adds chamomile to the profile description, which aligns with the calming, herbal undertone that the myrcene presence would predict.

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/wind-down 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 what we observed in the Leafly data for Jelly Breath (another indica-dominant hybrid with elevated CBG), and may contribute to the strain’s 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, non-sedating-to-the-point-of-couch-lock profile 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 align 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 genetic resilience.

What to grow instead

• 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. 49-56 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’s Humboldt Seed Company collection in 3, 5, and 10-seed packs of feminized photoperiod seeds, priced from $45 to $120.

Affiliate disclosure: we may earn a small commission if you purchase through this link, at no extra cost to you.

How we researched this review

This review synthesizes four source types:

• Breeder and retailer specs from Humboldt Seed Company and North Atlantic Seed Company for genetics (Purple Panty Dropper x Razzle Berry), F9 generation designation, flowering window, pack sizes, NASC category placements, and award wins.
• Community grower reports from Reddit, including a grow diary by u/Emotional-Pattern-20 on r/gardening documenting trichome development at six weeks, and an outdoor grow report on r/farmingthebestgreens confirming pest resistance and terpene quality.
• Aggregate consumer data from Leafly’s Blueberry Muffins page, drawing on 529 verified community reviews for terpene profile rankings, cannabinoid medians (20% THC, 1% CBG), effect frequency, and reported flavor notes.
• Award records: 2025 NASC Grower’s Choice Awards (1st Place Strain of the Year, 1st Place Photoperiod, 1st Place Extract) and 2017 Emerald Cup (6th Place).