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Fast Flowering Cannabis Seeds — Accelerated Photoperiod Genetics for Australia

Fast flowering seeds are photoperiod strains bred for shortened bloom cycles — finishing one to two weeks ahead of standard versions without switching to full autoflower genetics. This time advantage is critical for outdoor growers in southern Australian states who need to harvest before autumn weather deteriorates, and for indoor cultivators who want to squeeze an extra cycle into the calendar year. Potency and yield remain comparable to standard-duration versions.

All strains in this collection are bred & stabilised in-house by Royal King Genetics

209 strains available

Bloom Duration6–8 Weeks
Time Advantage1–2 Weeks Faster
Harvest WeightStandard to High
Ideal ForShort Seasons & Throughput

Fast Flowering Seeds catalogue at a glance

Our fast flowering seeds collection currently holds 209 strains in active inventory with verified THC content ranging from 5% at the low end to 30% at the high end (median 20%).

Strains
209
THC range
5-30%
Median THC
20%
Auto / Photo
209/0
  • Autoflowering: 209 strains (100% of the catalogue) — finishes 8-10 weeks seed-to-harvest.
  • Indica-dominant: 209 — body-led effects, compact structure, Myrcene-Caryophyllene terpene signature typical.
  • Alphabetical lineup starts with: 3X Crazy, 5th Element, 9 Pound Hammer — see the full grid below for filters, lab data and grower reports.

Fast Flowering Seeds — Browse All Strains

How Fast Flowering Seeds Differ From Standard Photoperiods

Fast flowering genetics achieve shorter bloom cycles through selective breeding with naturally early-finishing lineages or by incorporating a trace of ruderalis heritage — enough to accelerate flower development without making the plant fully autoflowering. The result is a plant that still requires a 12/12 light flip to initiate bloom but completes the flowering phase seven to fourteen days sooner than its standard counterpart. For outdoor growers in Tasmania, Victoria, and southern NSW, those extra days can be the difference between a clean harvest and mould-damaged flowers caught by late-autumn rain.

Fast Flowering Strains Worth Growing

Quick One wraps up the entire seed-to-harvest cycle in roughly eight weeks. Fast Buds Critical completes flowering in six weeks. Speed Haze finishes in eight weeks rather than the twelve its standard version demands. Fast Gorilla Glue delivers the parent strain's legendary potency with a seven-week bloom window. Each of these strains maintains competitive potency and yield relative to their slower siblings. Indoor growers running fast-flowering genetics can fit an additional harvest cycle per year.

Deciding Between Fast Flowering and Standard Autoflower Seeds

Both categories offer speed, but the mechanism differs. Fast flowering seeds are still photoperiod — you control vegetative duration and flip to flower when ready. This preserves the ability to veg plants to any size and to clone mothers. Autoflowers bloom on their own timeline with no grower intervention. If you want speed combined with the flexibility of photoperiod light control, fast flowering seeds are the answer. If you want maximum simplicity with zero light-schedule management, autoflowers win.

Frequently Asked Questions

How quickly do fast flowering strains finish?
Fast flowering genetics complete the bloom phase in six to eight weeks — one to two weeks faster than standard versions of the same strain. This compressed timeline is especially valuable for outdoor growers who need to harvest before autumn weather moves in.
Are fast flowering seeds the same thing as autoflowers?
No. Fast flowering seeds are photoperiod plants that require a 12/12 light switch to trigger bloom — they simply bloom faster once triggered. Autoflowers bloom automatically regardless of light schedule. Fast flowering seeds retain the vegetative flexibility and cloning potential that autoflowers lack.
Do faster bloom times reduce yield?
Current-generation fast flowering genetics yield comparably to their standard-duration counterparts. Breeding has focused on maintaining harvest weight and potency while compressing the bloom window. A minor 5–10% yield reduction is possible with some strains, but the time savings often deliver a net positive on an annual basis.
Who benefits most from fast flowering seeds?
Outdoor growers in cooler Australian regions with shorter warm seasons, indoor growers who want to maximise harvest cycles per year, and anyone who values quick turnaround without losing the vegetative control that autoflowers sacrifice.

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Fast Flowering Seeds A–Z

209 strains. Use the search bar above to find any strain.

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