Black Muffin F1 Fast Version

Black Muffin F1 Fast Version Cannabis Seeds by Sweet Seeds

Black Muffin F1 Fast Version is a 60% indica photoperiod hybrid that finishes flowering in just 7 weeks and produces red-purple buds dripping in resin. Bred by Sweet Seeds from a cross of Red Hot Cookies and Black Lemon Auto, this first filial (F1) hybrid brings genuine genetic vigour — uniform growth, strong branching, and the kind of bag appeal that makes you stop and stare at your own harvest.

This guide is written for adults aged 18 and over. Seed genetics, yields, and flowering times described below are based on breeder data from Sweet Seeds.

Why Black Muffin F1 Fast Version Deserves a Spot in Your Grow

Seven weeks of flowering. That's it. While most photoperiod indicas ask for 8–10 weeks before you can even think about chopping, Black Muffin F1 Fast Version wraps things up a full week or two earlier. For outdoor growers in northern Europe, that difference can mean harvesting before autumn rain and mould become a problem. For indoor growers, it means an extra cycle per year — and an extra cycle means more jars on the shelf.

The "F1" designation isn't marketing fluff here. First filial hybrids are the offspring of two genetically distinct, stable parent lines — in this case Red Hot Cookies (known for its deep red colouring and potency) and Black Lemon Auto (which brings dark pigmentation and citrus terps). When you cross two stable but different parents, the first generation shows what breeders call hybrid vigour: faster vegetative growth, stronger root development, and more uniform plants across a batch. We've seen this play out in our own experience with F1 genetics — the consistency from seed to seed is noticeably better than with later-generation crosses.

And then there's the look of the finished flower. After drying and curing, Black Muffin F1 buds develop stunning red and purple calyxes with bright orange pistils, all coated in a thick layer of trichomes that covers both the inside and outside of every bud. If you've ever wanted to grow something that genuinely turns heads, this is your strain. The resin production also makes Black Muffin F1 Fast Version an excellent candidate for extracts — dry sift, rosin, or bubble hash all work brilliantly with trichome-heavy genetics like these.

Growing Black Muffin F1 Fast Version — What to Expect

Black Muffin F1 Fast Version grows as a bushy, moderate-height plant with strong lateral branching. She doesn't stretch excessively, which makes her manageable in tents from 80x80cm upwards. Those side branches develop into solid colas, so a bit of low-stress training (LST) early in veg can really open up the canopy and push yields toward that 600g/m² ceiling indoors.

Grower reports suggest she's not a particularly heavy feeder. One cultivator described her as needing "medium dosage of nutrients," while another running their first photoperiod grow started at 4 ml/L of nutrients and found the plant responded well from the jump. The honest limitation? With only 3 seeds per pack, you don't get much room for error. If you're popping all three, make sure your germination game is solid — soak in water for 12–24 hours, then transfer to damp paper towel until taproots appear.

Outdoors, Black Muffin F1 Fast Version can push 400–600g per plant, depending on your climate, container size, and how long you let her veg in the sun before the natural light cycle triggers flowering. The fast flowering period means she finishes earlier than most photoperiods — a genuine advantage if you're growing in the UK, the Netherlands, or anywhere else where September weather is a coin flip.

Aroma, Flavour, and the Finished Product

During flowering, Black Muffin F1 plants put out a rich, complex scent. Growers have described the smell as "amazing" — expect sweet, earthy notes with undertones that lean toward dark fruit and a hint of citrus from the Black Lemon Auto parent. The terpene profile carries through after a proper cure.

Visually, these buds are something else. The red-purple colouring isn't just on the surface — crack a nug open and you'll see the pigmentation runs deep into the calyx structure. Combined with that sugary trichome blanket and fiery orange pistils, Black Muffin F1 is the kind of flower that looks almost too good to grind up. Almost.

The dense bud structure and heavy resin coat make this strain particularly well-suited for hash and concentrate production. If you press rosin, you'll appreciate the return. If you prefer smoking flower, the density means each bud packs a punch without crumbling apart.

Black Muffin F1 vs Other Fast-Flowering Strains

Sweet Seeds has built a solid lineup of Fast Version genetics. Compared to Green Poison Fast (also from Sweet Seeds), Black Muffin F1 trades a bit of the classic sweet-fruit terp profile for that distinctive red-purple colouring and darker, more complex flavour. Tropicanna Poison F1 Fast is another option if you want colourful buds, but Black Muffin F1 edges it on speed — 7 weeks versus Tropicanna's typical 8.

If speed and bag appeal are your top priorities, Black Muffin F1 Fast Version is the best pick of the three. If you want something slightly more forgiving for a first grow, Green Poison Fast is a solid alternative — but you'll miss out on those jaw-dropping red buds.

How to Grow Black Muffin F1 Fast Version Seeds

1. Soak seeds in a glass of room-temperature water for 12–24 hours until they sink. Transfer to damp paper towel in a warm, dark spot (20–25°C) and wait for taproots to emerge — usually 24–72 hours.
2. Plant each germinated seed 1–1.5cm deep in a small pot of lightly moistened seedling soil. Keep humidity high (70–80%) and temperatures around 22–25°C during the seedling stage.
3. Vegetate under 18/6 light for 3–5 weeks, depending on your space and desired plant size. Black Muffin F1 responds well to low-stress training — gently bend and tie down the main stem to expose lower branches to light.
4. Switch to a 12/12 light cycle to trigger flowering. She'll finish in approximately 7 weeks from the flip. Keep temperatures between 20–26°C and humidity below 50% during late flower to protect those dense buds from mould.
5. Feed at medium nutrient strength — she's not a heavy feeder. Increase bloom nutrients gradually during weeks 2–5 of flowering, then flush with plain water for the final 7–10 days before harvest.
6. Harvest when trichomes are mostly milky with some amber. Dry slowly in a dark room at 18–20°C and 55–60% humidity for 10–14 days, then cure in glass jars for at least 2 weeks. The red-purple colours deepen beautifully during a proper cure.

Frequently Asked Questions

Last updated: April 2026