Cannabis seed collection
High THC cannabis seeds in Australia
High THC seeds are for growers who want the most potent result their patch can produce. This range collects strains that consistently test above 20% THC, with several pushing past 25% when grown well, in feminised and autoflower form. Potency isn't just genetics — Australian sun and long summer days give these strains the intense light they need to reach their full potential, which is why outdoor grows in Queensland, Western Australia and inland New South Wales can rival indoor results. Each listing shows the tested THC range, the terpene profile that shapes the effect, and how the strain handles heat, so you can pick something that delivers strength without wilting in a January heatwave. Expect dense, resin-heavy flowers that reward careful drying and curing.
Cannabis seed results
$100 OG
$100 OG is a feminised hybrid cultivar associated with OG Kush genetics, with reported THC of 18–24% and CBD of 0–1%.
13 Dawgs
13 Dawgs is a feminised hybrid cultivar documented as Chemdawg × G13, with reported earthy and sweet flavour descriptors.
24K Gold
24K Gold feminised seeds are indica-leaning, with orange, citrus, sweet and earthy flavours and a 9–11 week flowering time.
From $79.00
501st OG
501st OG is a feminised hybrid cultivar with documented Rare Dankness #1 and Skywalker OG lineage and earthy, pine notes.
5th Element
5th Element is a feminised cultivar with documented Blackberry genetics, an indica phenotype and an earthy flavour profile.
5th Element Auto
5th Element Auto is an autoflower cultivar described as indica, with Blackberry genetics, an earthy flavour and 20–21% THC.
707
707 is a feminised hybrid cultivar documented as OG Kush × Sour Diesel, with an earthy descriptor and 19–21% THC.
8 Ball Kush
8 Ball Kush is a feminised, Afghani-lineage cultivar with a reported indica phenotype and earthy, pine and spicy notes.
9 lb Hammer Auto
9 lb Hammer Auto is an autoflower cultivar with a reported indica phenotype, 20% THC and citrus, earthy and berry notes.
9 Pound Hammer
9 Pound Hammer feminised seeds offer an indica-dominant profile with sweet berry, grape and citrus flavours, suited to intermediate growers.
From $99.00
98 Aloha White Widow
98 Aloha White Widow is a feminised hybrid listed as Maui Wowie x Kona Gold, with a reported THC range of 22–23%.
Aberdeen
Aberdeen is a feminised hybrid listed as Jack the Ripper x Orange Velvet, with THC and CBD ranges recorded in its profile.
Aberdeen Auto
Aberdeen Auto is an autoflower hybrid with documented Jack the Ripper x Orange Velvet lineage and a reported THC range of 16–22%.
Abusive OG
Abusive OG is a feminised OG Kush cultivar profile with a reported indica phenotype, earthy and pine notes, and 16–20% THC.
Abusive OG Auto
Abusive OG Auto is an autoflower cultivar documented with OG Kush genetics, an indica phenotype and earthy, pine aromas.
Acapulco Gold
Acapulco Gold feminised seeds offer a sativa-dominant profile with sweet citrus, lemon and fruity flavours for intermediate growers.
From $89.00
Acapulco Gold Auto
Acapulco Gold Auto is a sativa-dominant autoflower with earthy pine, sweet citrus and fruit flavours, suited to hot, dry or temperate climates.
From $89.00
Ace Killer OG
Ace Killer OG is a feminised cultivar reported as White Fire OG crossed with Kosher Kush, with earthy and pine flavour notes.
Ace Killer OG Auto
Ace Killer OG Auto is an autoflower cultivar with documented White Fire OG x Kosher Kush lineage and earthy, pine notes.
Ace of Spades
Ace of Spades is a feminised, indica-described cultivar with documented Black Cherry Soda and Jack the Ripper lineage.
Ace of Spades Auto
Ace of Spades Auto is an autoflower seed type with documented Black Cherry Soda x Jack the Ripper lineage and a sweet, fruity aroma profile.
Afcrack
Afcrack is a feminised hybrid cultivar documented as Green Crack x Afgoo, with citrus and berry flavour descriptors.
Afghan Big Bud
Afghan Big Bud is a feminised, indica-reported cultivar documented as Afghani x Big Bud, with a sweet flavour descriptor.
Afghan Big Bud Auto
Afghan Big Bud Auto is an autoflower cultivar with documented Afghani × Big Bud lineage and a reported indica phenotype.
Afghan Hawaiian
Afghan Hawaiian is a feminised Lavender x UK Cheese cultivar with reported citrus and berry notes and an indica phenotype.
Afghan Hawaiian Auto
Afghan Hawaiian Auto is an autoflower cultivar listed with Lavender × UK Cheese lineage, citrus and berry notes, and an indica phenotype.
Afghan Kush
Afghan Kush feminised photoperiod seeds offer a pure indica profile with earthy, herbal, pine and spicy flavours.
From $99.00
Afpak
Afpak is a feminised cultivar with documented Afghani genetics, a reported hybrid phenotype and earthy, pine and sweet notes.
Agent Orange
Agent Orange feminised seeds offer a sativa-dominant photoperiod profile with sweet orange and citrus flavours, suited to intermediate growers.
From $89.00
Agent Tangie
Agent Tangie is a feminized hybrid-profile cultivar with reported citrus and spicy notes and THC of 17–23%.
Agent Tangie Auto
Agent Tangie Auto is an autoflower hybrid profile with reported citrus and spicy notes, THC of 17–23% and CBD of 0–1%.
AK-47 Auto
AK-47 Auto is an autoflowering, sativa-leaning hybrid with pungent, herbal and sweet flavours, suited to beginners and cool, short seasons.
From $79.00
Alaskan Ice
Alaskan Ice is a feminised, sativa-reported cultivar with Haze and White Widow lineage, an earthy flavour and 16–21% THC.
Alaskan Thunder Fuck
Alaskan Thunder Fuck feminised seeds have a sativa-dominant profile with pine, citrus and sweet flavours, suited to intermediate growers.
From $89.00
Alchemy
Alchemy is a feminised hybrid cultivar with documented Chemdawg x Querkle lineage and sweet, berry aroma descriptors.
Alien Bubba
Alien Bubba is a feminised, indica-reported cultivar documented as Bubba Kush crossed with Alien Kush, with an earthy flavour profile.
Alien Bubba Auto
Alien Bubba Auto is an autoflower cultivar with Bubba Kush x Alien Kush lineage and a reported indica phenotype.
Alien Kush
Alien Kush is a feminised, indica-reported cultivar with documented Alien Dawg x LVPK lineage and earthy, pine notes.
Alien Kush Auto
Alien Kush Auto is an autoflower seed type with documented Alien Dawg × LVPK lineage and reported earthy and pine notes.
Alien Mints
Alien Mints is a feminised hybrid cultivar associated with Animal Mints, with reported THC of 20–28% and CBD of 0–1%.
Alien OG
Alien OG feminised seeds offer a balanced photoperiod hybrid profile with pine, lemon, earthy and sweet flavours.
From $79.00
Alien Reunion
Alien Reunion is a feminised hybrid cultivar documented as Alien OG x Alien Dawg, with a reported THC range of 17–24%.
Alien Reunion Auto
Alien Reunion Auto is an autoflower seed type with documented Alien OG x Alien Dawg lineage and a reported hybrid phenotype.
Alien Rift
Alien Rift is a feminised, indica-leaning cultivar documented as Alien OG crossed with Alien Dawg, with citrus and earthy notes.
Alien Rift Auto
Alien Rift Auto is an autoflower seed type with documented Alien OG x Alien Dawg lineage and citrus and earthy flavour notes.
Alien Walker
Alien Walker is a feminised hybrid cultivar with documented Albert Walker x Tahoe Alien lineage and citrus, earthy descriptors.
Allen Wrench
Allen Wrench is a feminised, sativa-reported cultivar documented as Trainwreck crossed with NYC Diesel.
Alpha Blue
Alpha Blue is a feminised, sativa-described cultivar with documented NYC Diesel x Blue Dream lineage and citrus and berry notes.
How to choose high THC seeds
Don't chase the single highest number. The difference between a strain that tests 24% and one that tests 27% is far smaller than the difference between a well-grown and a poorly grown plant of either. Instead, filter for strains whose structure suits your climate — many of the most potent modern strains are dense, resinous indica-dominant hybrids that rot in humidity, so growers in Queensland should look for the high-THC sativa hybrids and open-structured Haze crosses in this range. Then read the terpene profile: a 25% strain heavy in myrcene and a 25% strain heavy in limonene are very different experiences. Finally, check flowering weeks. Potency peaks at full maturity, and a strain that can't finish before your autumn rain will never hit its number.
Growing high THC seeds in Australia
Three things drive potency once you've chosen the genetics: light intensity, harvest timing and post-harvest handling. Australian sun delivers the first for free — full-sun positions with at least eight hours of direct light produce measurably more resinous flower than partial shade. Harvest timing is where most growers lose potency: THC peaks when the majority of trichomes are cloudy with the first amber appearing, and every week past that point trades THC for a heavier, sleepier effect. Drying too fast, too warm or in direct light degrades THC and terpenes faster than any other single mistake.
| Climate | Best-suited high-THC types | Watch for |
|---|---|---|
| Hot & humid | Sativa-dominant hybrids, Haze crosses, open-structured Cookies-family strains | Bud rot in dense colas; harvest before the wet |
| Hot & dry | Dense indica hybrids, OG and Kush lines — ideal conditions | Heat stress above 38°C degrades terpenes; shade at midday |
| Temperate | Almost anything; the widest choice | Late-finishing strains vs autumn rain |
| Cool | Fast-version high-THC strains, potent autos | Finishing time; frost in April |
Feed generously in flower — high-THC hybrids are heavy feeders — but flush with plain water for the last 10 to 14 days. Cure in jars for at least four weeks; potency is stable, but the smoothness and flavour that make strong flower enjoyable develop in the cure.
If you're after strength with a softer edge, our CBD seeds range includes balanced strains. Read when to harvest cannabis trichomes to learn when resin peaks, and drying curing cannabis humid to protect it afterwards.
Cannabis seed collection
Frequently asked questions
What THC percentage counts as high?
Anything above about 20% is considered high; strains above 25% are at the top end of what's achievable. Actual results depend on growing conditions, harvest timing and curing as much as genetics.
Do high-THC strains need more light or nutrients?
They need full sun or strong indoor light to reach their potential, and most are heavy feeders in flower. The genetics set the ceiling; your light, feeding and harvest timing decide how close you get to it.
Are high-THC strains harder to grow?
Not necessarily. Several of the strongest strains in this range are also among the easiest, with sturdy structures and good mould resistance. Check the difficulty rating on each listing.
Will my outdoor plant reach the THC percentage on the listing?
The listed range is what the strain achieves under good conditions. Full sun, correct harvest timing and a careful dry and cure will get you there; shade, early harvest or a hot fast dry will land you below it.
Does UV light increase THC?
There's reasonable evidence that UV-B exposure increases resin production as the plant protects itself, and Australian outdoor grows get plenty of it. It's one reason well-grown outdoor Australian flower can match indoor potency.
Which is stronger, indica or sativa?
Neither, by definition. THC content is a property of the individual strain, not the type. This range includes very potent strains of both, and the most potent modern strains are usually hybrids. ---