Seeds
Black Jack F1 Fast Feminised Seeds
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SKU: SS-BLKJ-FAST-Fem
Quicker flowering Black Jack version
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Flowering Type
Early/fast
Parental lines
S.A.D. Sweet Afgani Delicious Auto® x Black Jack®
THC content
High THC (16-24%)
CBD content
Medium CBD (1-5%)
Photoperiod flowering time
7 to 9 weeks
Yield indoor
High Yield (450-600gr/m2)
Plant size
Medium
Suitable climates
Cool, Dry, Hot, Temperate, Warm, Wet
From the breeder
Quicker flowering Black Jack version
Sweet Seeds breeder notesAroma
EarthyPineyWoody
Parental lines
S.A.D. Sweet Afgani Delicious Auto®Black Jack®
Quicker flowering Black Jack version
Feminized and photoperiod-dependent version with an ultra-fast flowering of one of the first and most appreciated strains of our catalogue, our Black Jack®. This F1 hybrid is the result from the cross between a selected genetic line of S.A.D. Sweet Afghani Delicious Auto® and the Jack Herer elite clone used in the original Black Jack®.
Just like the original version this strain produces very potent and productive plants, with strong side branches that are very long and fully loaded with aromatic flowers. The aroma is very sweet, featuring hints of incense complemented by lemony citrus tones. This version shortens the flowering time by one week compared to the original version.
Brand/breeder
Parental lines
S.A.D. Sweet Afgani Delicious Auto® x Black Jack®
Variety
Indica / Sativa hybrid
Flowering type
Early/fast
Sex
Feminised
THC content
High THC (16-24%)
CBD content
Medium CBD (1-5%)
Yield outdoor
High Yield (450-750gr/plant)
Yield indoor
High Yield (450-600gr/m2)
Plant size
Medium
Photoperiod flowering time
7 to 9 weeks
Northern hemisphere harvest
September
Southern hemisphere harvest
May
Suitable climates
Cool, Dry, Hot, Temperate, Warm, Wet
Aroma
Earthy, Piney, Woody
SKU
SS-BLKJ-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