Seeds
Black Muffin F1 Fast Feminised Seeds
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SKU: SS-BLMF1-FAST-FEM
Indica-dominant FAST version with very good yields and THC production.
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Flowering Type
Early/fast
Parental lines
Red Hot Cookies x Black Lemon Auto
THC content
Very High THC (25%+)
CBD content
Low CBD (0-1%)
Photoperiod flowering time
6 to 8 weeks
Yield indoor
High Yield (450-600gr/m2)
Plant size
Information not available
Suitable climates
Dry, Hot, Temperate, Warm
From the breederSweet Seeds breeder notes
Indica-dominant FAST version with very good yields and THC production.
Aroma
Fruity
Parental lines
Red Hot CookiesBlack Lemon Auto
Indica-dominant FAST version with very good yields and THC production.
This is an ultra-fast flowering, photoperiod-dependent, feminized strain that develops red flowers. Black Muffin F1 Fast Version® is a first filial generation (F1) cross between a photoperiod-dependent elite clone from our Red Hot Cookies® and the select autoflowering strain Black Lemon Auto.
The strain has a vigorous hybrid character and grows long side branches with thick, compact buds that are soaked with aromatic resin. The buds turn a dark purple color in the flowering stage, emitting a thick, potent, sweet-and-sour aroma with fresh citrus tones of lemons and mandarins, plus a tart undertone of red berries.
Black Muffin F1 Fast Version® has an intense yet balanced, relaxing, and happy effect that stimulates conversation and the imagination.
Brand/breeder
Parental lines
Red Hot Cookies x Black Lemon Auto
Variety
Indica dominant
Colour
Purple
Flowering type
Early/fast
Sex
Feminised
THC content
Very High THC (25%+)
CBD content
Low CBD (0-1%)
Yield outdoor
High Yield (450-750gr/plant)
Yield indoor
High Yield (450-600gr/m2)
Photoperiod flowering time
6 to 8 weeks
Suitable climates
Dry, Hot, Temperate, Warm
Aroma
Fruity
SKU
SS-BLMF1-FAST-FEM
Early/Fast outdoor timeline
Fast / Early strains keep the photoperiod growth pattern, but they begin flowering earlier and usually finish sooner — helping outdoor growers harvest before late-season weather becomes a problem.
Stage 1
Germination / Early Start
March – April
Wait for: warmer days, lower frost risk, stable spring weather
Watch for: cold snaps, excess moisture, slow early growth
Stage 2
Seedling / Transplant
May
Wait for: steady light, mild conditions, protected early growth
Watch for: transplant stress, pests, wind exposure
Stage 3
Vegetative Growth
June – July
Wait for: long bright days, healthy expansion, strong structure
Watch for: overcrowding, nutrient issues, insect pressure
Stage 4
Flowering
From late July
Wait for: first signs of bloom, good airflow, settled conditions
Watch for: humidity, mould pressure, poor weather
Stage 5
Harvest
From early September
Wait for: ripe trichomes, dense finished flowers, harvest readiness
Watch for: cutting too early, rain, bud rot
Indoor Early/Fast timeline
Fast / Early strains are most valuable outdoors, where earlier flowering and shorter bloom times help growers harvest before poor autumn weather. Indoors, their main benefit is a faster flowering phase than photoperiod versions.
Week 0
Germination
Healthy seedling emergence
Wait for: healthy seedling emergence
Watch for: overwatering, weak starts
Week 1–2
Seedling
Steady early growth
Wait for: steady early growth
Watch for: stretching, stress, excess moisture
Week 3–6+
Vegetative Growth
Desired plant size and strong structure
Wait for: desired plant size and strong structure
Watch for: overcrowding, uneven growth, training stress
6–10 weeks
Flowering Phase
Strong bud formation and steady flower development
Wait for: strong bud formation and steady flower development
Watch for: humidity issues, poor airflow, plant stress
Harvest
Harvest Window
Finished flowers and mature trichomes
Wait for: finished flowers and mature trichomes
Watch for: harvesting too early or pushing plants too long
