Seeds
Double Blue Feminised Seeds
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SKU: AMG-DBLU-FEM
Productive, relaxing and therapeutic cannabis strain.
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Flowering Type
Photoperiod
Parental lines
Double Gum (Bubble Gum x Bubble Gum) x Blue Dream (Blueberry x Mexican Sativa)
THC content
High THC (16-24%)
CBD content
Low CBD (0-1%)
Autoflowering seed to harvest time
Information not available
Yield indoor
Information not available
Plant size
Information not available
Suitable climates
Dry, Warm
From the breeder
Productive, relaxing and therapeutic cannabis strain.
Amsterdam Genetics breeder notesParental lines
Double Gum (Bubble GumBubble Gum)Blue Dream (BlueberryMe
Productive, relaxing and therapeutic cannabis strain.
Double Blue is a 70% indica hybrid bred from the Double Gum and Blue Dream cannabis strains. Growers can expect good yields with a heavy physical, narcotic-like effect. Suitable for both outdoor and indoor grows.
Double Blue has a sweet berry scent and a sweet, fruity flavour. Indoors flowering takes 9 - 10 weeks producing yields of between 450 -550 gr/m2. Outdoors plants grow somewhat larger and potentially yield between 400 - 600 gr. each.
Cannabinoid content is around 20% THC, 0.8% CBG and 0.5% CBD.
Brand/breeder
Amsterdam Genetics
Parental lines
Double Gum (Bubble Gum x Bubble Gum) x Blue Dream (Blueberry x Mexican Sativa)
Flowering type
Photoperiod
Sex
Feminised
THC content
High THC (16-24%)
CBD content
Low CBD (0-1%)
Suitable climates
Dry, Warm
SKU
AMG-DBLU-FEM
Photoperiod outdoor timeline
Photoperiod strains rely on seasonal daylight changes, so harvest timing is closely tied to your local climate.
Stage 1
Germination / Early Start
March – April
Wait for: frost risk easing, stronger spring light
Watch for: cold snaps, slow starts, excess moisture
Stage 2
Seedling / Transplant
April – May
Wait for: milder nights and settled weather
Watch for: transplant shock, wind exposure, pests
Stage 3
Vegetative Growth
June – July
Wait for: long days, regular feeding, healthy expansion
Watch for: overcrowding, nutrient issues, insect damage
Stage 4
Flowering
August – September
Wait for: shortening days, dry airflow, branch support
Watch for: mould, botrytis, high humidity, bad weather
Stage 5
Harvest
Late September – October
Wait for: ripe trichomes, dense finished flowers
Watch for: autumn rain, rot, early frosts
Indoor photoperiod timeline
Photoperiod strains give indoor growers more control over size, shape, and when flowering begins.
Week 0
Germination
Strong early establishment
Wait for: strong early establishment
Watch for: inconsistent starts, excess moisture
Week 1–2
Seedling
Stable structure and healthy growth
Wait for: stable structure and healthy growth
Watch for: stretch, early stress
Week 3–6+
Vegetative Growth
Desired plant size and canopy shape
Wait for: desired plant size and canopy shape
Watch for: overcrowding, uneven growth, training stress
7–12+ weeks
Flowering Phase
Strong flower formation and steady development
Wait for: strong flower formation and steady development
Watch for: humidity, airflow, support issues
Harvest
Harvest Window
Finished flowers and mature trichomes
Wait for: finished flowers and mature trichomes
Watch for: cutting too early or pushing too long
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