Fast Version Seeds

 

What Are Fast Version Cannabis Seeds?

Fast version cannabis seeds are photoperiod seeds bred by crossing standard photoperiod genetics with autoflowering genetics to shorten the flowering phase - typically to 45–60 days - while keeping the plant's dependence on light cycles intact. 

Unlike autoflowering weed seeds (which flower based on age regardless of light) , fast version marijuana seeds will not enter the flowering stage until growers switch to a 12-hour dark period.

That distinction matters because light-cycle control lets cultivators time the harvest, size the plant during a longer vegetative phase and push for higher yields than autoflowers usually deliver.

Fast version cannabis seeds are also sold under several other names, including:

• Fast seeds
• Fast flowering seeds
• Fast-growing cannabis seeds
• Fast-flowering feminized seeds

These fast-growing cannabis seeds all refer to the same photoperiod seed type. The naming varies by breeder and store but the underlying genetics are the same: a photoperiod strain crossed with autoflowering genetics to shorten the bloom without removing the light-cycle trigger. 

How Fast Version Seeds Differ From Standard Photoperiod Seeds

Fast version seeds differ from standard photoperiod  pot seeds in one key attribute: flowering speed. A standard photoperiod strain typically takes 8–12 weeks to complete flowering. Fast growing pot seeds compress that window to 6–8 weeks while preserving the strain's core genetics, cannabinoid profile and terpene expression.

Structural differences between the two are minor - fast version cannabis plants show the same growth patterns, bud formation and yield potential as their photoperiod parents, just on a tighter timeline.

Who Fast Budding Seeds Suit Best

Fast budding seeds suit growers who want photoperiod-level control with a shorter commit on time. Indoor cultivators running back-to-back cycles benefit from the shortened bloom, since each extra week saved is a week gained toward the next run.

Outdoor growers in regions with short warm seasons - where a standard photoperiod strain might run into early frost - use fast growing weed seeds to lock in the harvest before conditions deteriorate.

How Do the Fastest Flowering Seeds Work?

Fastest flowering seeds trigger the flowering phase through light, not age. When growers reduce the light cycle to 12 hours of light and 12 hours of darkness, fast flowering cannabis plants respond by switching from vegetative growth to bud production - the same mechanism that governs any photoperiod strain.

The difference is that the flowering period itself is genetically compressed, so the plant reaches full bud maturity in 45–60 days from the flip rather than the 8–12 weeks a standard photoperiod strain requires.

The compressed flowering period comes from autoflowering genetics introduced during breeding. Breeders select for the ruderalis-derived early-finish trait while filtering out the autoflowering trigger, which means the resulting fast flower seed inherits the speed without losing light-cycle dependence.

Growers who understand this can extend the vegetative phase to build plant size and yield potential, then flip the light schedule to hit harvest ahead of any standard photoperiod timeline.

Fast Flowering Cannabis Seeds vs Autoflowering Weed Seeds

Fast flowering cannabis seeds differ from autoflowering weed seeds in flowering trigger, vegetative phase length and grower control. Both seed types reach harvest faster than standard photoperiod strains, but the path each takes is distinct enough to affect setup, yield expectations and who each type suits best.

The table below maps the key differences across the attributes that matter most to buyers choosing between the two seed types.

Feature	Fast Flowering Cannabis Seeds	Autoflowering Weed Seeds
Flowering trigger	Light-dependent — 12/12 schedule required	Age-dependent — flowers automatically
Flowering time	45–60 days from light flip	50–70 days from flower initiation
Vegetative phase	Grower-controlled — longer veg builds bigger plants	Minimal — flowering initiates automatically within 2–4 weeks of germination
Grower control	High — light schedule controls size and timing	Low — growth schedule is mostly fixed
THC and bud density	High — comparable to full photoperiod parents	Moderate to high — slightly smaller buds
Yield potential	High — longer veg phase allows larger plants	Moderate — compact plants, lower total volume
Best for	Growers who want speed with photoperiod-level control	Beginners or growers with very limited space or time

Fast version flowering time measured from light flip. Autoflower flowering time measured from flower initiation; total seed-to-harvest is typically 60–90 days.

Fast flowering seeds are the stronger choice for cultivators who want to run multiple harvests a year while keeping the yield and potency associated with photoperiod genetics.

Autoflowering weed seeds suit growers where simplicity and compact plant size matter more than maximizing output.

For growers comparing fast flower seeds against feminized pot seeds that run standard photoperiod timelines, the primary trade-off is control over finish date versus maximum vegetative flexibility.

If you are curious about how standard autoflowering vs feminized seeds compare, our guide breaks down the differences in detail. Understanding the differences between female vs male weed plant expression also helps when evaluating which cannabis seeds to purchase.

What Are the Benefits of Fast-Flowering Seeds?

Fast flower seeds deliver faster harvest cycles without reducing the THC levels, bud density or terpene quality of standard photoperiod strains. That combination gives cultivators a genuine upgrade over the standard photoperiod timeline without forcing a trade-off in output.

The key benefits that fast-flowering cannabis seeds provide include:

• Shortened flowering window — 45–60 days to harvest versus 8–12 weeks for standard photoperiod strains, with no reduction in final bud quality.
• Multiple cycles per year — the compressed bloom opens additional harvest windows for indoor growers and extends the viable outdoor season in short-summer climates.
• Mold and pest resistance — less time in the flowering phase reduces cumulative exposure to humidity-related mold pressure and late-season pest activity.
• Full photoperiod control — growers manage vegetative phase length and flip timing, allowing plant size and yield to be optimized before the bloom begins.
• Photoperiod-level potency — fast feminized seeds inherit the cannabinoid and terpene profiles of their photoperiod parents, not the compressed expression of autoflowering genetics.

For yield-focused grows, the highest yielding cannabis seeds include autoflowering, feminized and fast version options.

Key Conditions For Fast-Growing Weed Seeds

Fast-growing weed seeds perform best when growers maintain consistent light, temperature and humidity throughout the flowering phase. These marijuana seeds share the environmental preferences of standard photoperiod strains but benefit from tighter control during the compressed bloom window.

Any stress event during the 45–60-day period has a proportionally larger impact on final yield and bud quality.

This section covers the three main condition areas that determine outcomes:

• Indoor conditions — light schedule, temperature and humidity targets for controlled environments.
• Outdoor conditions — planting timing, soil requirements and climate fit.
• Nutrients and training — feeding strategy and techniques that maximise fast-version yield potential.

Fast growing pot plants also work well alongside beginner-friendly weed seeds in mixed setups, where newer growers run lower-maintenance strains while gaining experience with the light-cycle management fast seeds require. 

Indoor Conditions for Fast Flowering Cannabis Seeds

Indoor fast flowering cannabis requires a 12-hour light / 12-hour dark schedule to trigger and hold the flowering phase. Daytime temperatures between 70–80°F with slightly cooler nights encourage robust growth and resin development.

Temperatures above 85°F during bloom accelerate terpene volatilization, reducing aromatic complexity and overall bud quality. Relative humidity should stay at 40–50% throughout the flowering window. Above 55%, a dense canopy carries significantly higher mold risk as buds swell and airflow decreases.

Container size matters for yield: fast flower seeds switched to 12/12 early stay smaller and produce less. Growers who extend the vegetative phase to 4–6 weeks before flipping build the plant structure to support the best yield outcomes.

Outdoor Conditions for Fast Growing Marijuana Seeds

Outdoor fast growing marijuana seeds should be started during long-daylight months when ambient temperatures are consistently above 60°F at night.

The compressed flowering window means an outdoor crop of fast growing cannabis seeds can finish 2–3 weeks ahead of a standard photoperiod strain planted on the same date — a meaningful advantage in climates where early frost or late-season humidity marks the end of the viable grow window.

Well-draining soil with a pH between 6.0 and 6.5, consistent watering and full sun exposure give outdoor plants the structural base to support dense final yields.

Nutrients and Training for Fast Version Seeds

Fast seeds respond to the same two-phase feeding strategy as any photoperiod strain: nitrogen-heavy formulas during vegetative growth, phosphorus and potassium-forward feeds once the 12/12 flip initiates. 

Because the flowering phase is compressed, timing the nutrient transition to within a day or two of the flip prevents a mid-bloom nitrogen excess that delays trichome maturation.

Low-stress training (LST) applied during the vegetative phase opens the canopy before the flip and creates multiple bud sites that ripen evenly across the shortened bloom.

The Fastest Flowering Strains Available at Seed Supreme

Fast version seeds in this collection include photoperiod-based hybrids bred for shortened flowering windows across indica-dominant, sativa-dominant and balanced genetics. Here are some of the best-selling fast version seeds available at Seed Supreme:

Bruce Banner Fast Version — a sativa-leaning hybrid with THC levels that approach 30% in tested phenotypes. The flowering window runs approximately 6 weeks, making it one of the fastest growing weed strains in this collection. Expect sweet strawberry and fuel notes from a myrcene, caryophyllene and limonene terpene profile, with dense, resin-heavy flowers.

Big Bud Fast Version — an indica-dominant strain finishing around 6 weeks of flowering, bred for yield volume. Skunky, earthy and spicy aromas with dense, resinous flowers. THC sits in the 14–18% range, making it one of the more approachable fast budding seeds in this collection for growers focused on output over intensity.

OG Kush Fast Version — an indica-dominant hybrid that delivers the classic OG Kush terpene signature — fuel, kerosene and citrus — in a faster-finishing photoperiod format. Dense, resinous buds with high THC and a progression from cerebral euphoria into physical relaxation. Suited to indoor cultivation with compact growth habits.

Explore More Cannabis Seed Categories

Cannabis seeds come in a few different categories, and some are specifically bred to help cultivators speed up the path from seed to harvest. Fast version cannabis seeds sit alongside a wider range of seed types built for different goals and growing styles. Growers chasing maximum potency can browse high THC seeds for strains pushing the upper limits of cannabinoid output. 

Those who prefer tall, light-hungry plants with cerebral effects will find what they need in the sativa seeds collection, while growers running compact indoor setups tend to favor indica seeds for their shorter stature and faster natural finish. 

For cultivators interested in original genetics with deep regional roots, the landrace seeds range covers heritage strains from their native environments.

Every pack of pot seeds ships to eligible adult buyers across the U.S. where permitted by federal, state and local rules.

FAQs About Fast-Growing Marijuana Seeds

Still have a question? Below are some answers to queries we get about fast-flowering cannabis seeds.

Are Fast Budding Seeds the Same as Autoflowering Seeds?

No. Fast budding seeds are not autoflowering. Fast flowering cannabis seeds require a 12/12 light schedule to trigger flowering; autoflowering weed seeds flower based on age regardless of light. Fast version seeds are a subtype of photoperiod genetics, not a form of autoflower.

How Long Do the Fastest Flowering Seeds Take to Finish?

The fastest flowering seeds typically complete flowering in 45–60 days from the light flip, depending on strain genetics and growing conditions. Standard photoperiod strains typically take 8–12 weeks; fast growing marijuana seeds shorten that window by approximately 2 weeks or more. Strains advertised as 5 week flowering strains fall within the lower end of this range.

Can Fast Growing Weed Seeds Be Grown Outdoors?

Yes. Fast growing weed seeds perform well outdoors, where the compressed flowering period allows harvest 2–3 weeks earlier than a standard photoperiod strain planted on the same schedule. Outdoor growers in short-season climates benefit most from the earlier finish date.

Do Fast Flower Seeds Produce Less Yield Than Standard Seeds?

Fast flower seeds produce yields comparable to their photoperiod parents when given adequate vegetative time before the flip. Yield reduction occurs when plants are flipped too early and the vegetative structure cannot support full bud development — not as an inherent trait of fast flowering cannabis genetics.

What is the Difference Between Fast Feminized Seeds and Regular Fast Seeds?

Fast feminized seeds and regular fast seeds differ in one key attribute: sex determination. Feminized fast seeds ensure nearly all plants are female cannabis plants that produce buds rather than pollen.Regular fast seeds include both sexes and suit breeders. Most fast flowering seeds are feminized.