Seeds
Critical Lemon Fast Feminised Seeds
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SKU: ADV-CRL-FAST-FEM
FAST version of this strong-smelling, indica-dominant strain. Good yields.
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Flowering Type
Early/fast
Parental lines
Critical x Citral x Ruderalis
THC content
High THC (16-24%)
CBD content
Information not available
Photoperiod flowering time
7 to 9 weeks
Yield indoor
High Yield (450-600gr/m2)
Plant size
Large
Suitable climates
Hot, Dry, Temperate
From the breederAdvanced Seeds breeder notes
FAST version of this strong-smelling, indica-dominant strain. Good yields.
Aroma
Fruity
Parental lines
CriticalCitralRuderalis
FAST version of this strong-smelling, indica-dominant strain. Good yields.
Critical Lemon FAST is a feminised, indica-dominant strain that has added ruderalis genetics before a selection was made based on non-autoflowering traits. The ruderalis has the effect of reducing flowering times by a week or ten days.
Critical Lemon FAST grows to a height of 80 - 90cm indoors taking between 50 - 55 days to flower with yields of 500 - 550 gr/m2. Outdoors, in the northern hemisphere, plants can grow as tall as 220cm, being ready for harvest between September 15th - 30th.
This strain features grapefruit and lemon terps and produces a THC level of up to 21%.
Brand/breeder
Advanced Seeds
Parental lines
Critical x Citral x Ruderalis
Variety
Indica dominant
Flowering type
Early/fast
Sex
Feminised
THC content
High THC (16-24%)
Yield outdoor
High Yield (450-750gr/plant)
Yield indoor
High Yield (450-600gr/m2)
Plant size
Large
Photoperiod flowering time
7 to 9 weeks
Northern hemisphere harvest
September
Suitable climates
Hot, Dry, Temperate
Aroma
Fruity
SKU
ADV-CRL-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
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