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
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
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
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
Afghan Kush
Afghan Kush feminised photoperiod seeds offer a pure indica profile with earthy, herbal, pine and spicy flavours.
From $99.00
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
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 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
Alien OG
Alien OG feminised seeds offer a balanced photoperiod hybrid profile with pine, lemon, earthy and sweet flavours.
From $79.00
American Patriot
American Patriot is a feminised, indica-dominant cultivar with cheese, coffee, herbal and spicy flavours and an 8–9 week flowering time.
From $99.00
Amnesia
Amnesia feminised seeds offer a sativa-dominant profile with citrus, earthy and sweet flavours, suited to intermediate growers.
From $99.00
Amnesia Haze
Amnesia Haze feminised seeds offer a sativa-dominant profile with citrus, lemon and earthy flavours, suited to intermediate growers.
From $79.00
Amnesia Haze x White Widow
Amnesia Haze x White Widow feminised photoperiod seeds offer a sativa-leaning profile with earthy, lemon and sweet flavours.
From $79.00
Amnesia Kush
Amnesia Kush feminised seeds offer a sativa-dominant profile with citrus, lemon, sweet, pine, sour and tropical flavours.
From $89.00
Amnesia Kush Auto
Amnesia Kush Auto is an autoflower seed with a 60% sativa profile, citrus, lemon, sweet and pine flavours, and a 7–8 week flowering period.
From $89.00
Amnesia Lemon Kush
Amnesia Lemon Kush feminised seeds offer a 60% sativa, 40% indica profile with citrus, lemon, earthy and spicy flavours.
From $79.00
Animal Cookies
Animal Cookies feminised seeds offer an indica-dominant photoperiod profile with sweet, cherry, earthy and nutty flavours.
From $99.00
Animal Face
Animal Face feminised seeds offer a sativa-dominant photoperiod profile with citrus, diesel, earthy, nutty and pine flavours.
From $99.00
Animal Face Auto
Animal Face Auto is an autoflower seed with a 60% sativa profile and citrus, diesel, earthy, nutty, pine, spicy and sweet flavours.
From $99.00
Apple Betty
Apple Betty feminised seeds offer a balanced sativa–indica profile, with sweet, sour, fruity, lemon and chocolate flavours.
From $99.00
Apple Fritter
Apple Fritter feminised seeds offer a balanced photoperiod hybrid with sweet, earthy, spicy and sour flavours.
From $79.00
Apple Fritter Auto
Apple Fritter Auto is a beginner-friendly autoflower with a balanced indica-sativa profile and sweet, sour, earthy and spicy flavours.
From $89.00
Apples and Bananas
Apples and Bananas feminised seeds offer a balanced indica-sativa profile with sweet, fruity, banana and spicy flavours.
From $99.00
Archive Runtz
Archive Runtz feminised seeds offer balanced indica–sativa genetics, with sweet, fruity cookie flavours and a 9–10 week flowering period.
From $99.00
Australian Gold
Australian Gold feminised photoperiod seeds offer a sativa-dominant hybrid profile with sweet tropical, berry and haze flavours.
From $99.00
Banana Kush
Banana Kush feminised seeds offer an indica-dominant profile with sweet banana, tropical, earthy and citrus flavours.
From $89.00
Banana Kush Auto
Banana Kush Auto is an indica-dominant autoflower with sweet banana and tropical flavours, suited to beginner growers and varied climates.
From $89.00
Banana Zkittlez
Banana Zkittlez feminised photoperiod seeds offer an indica-leaning hybrid profile with sweet banana, citrus and tropical flavours.
From $99.00
Banana Zkittlez Auto
Banana Zkittlez Auto is a beginner-friendly autoflowering hybrid with a 60% indica profile and sweet banana, candy and tropical flavours.
From $99.00
Berner's Cookies
Berner's Cookies feminised seeds offer a sativa-leaning profile with sweet, fruity citrus flavours and a 9–10 week flowering period.
From $89.00
Big Bud
Big Bud feminised seeds offer an indica-dominant profile with earthy, sweet, fruity and skunky flavours, suited to intermediate growers.
From $79.00
Big Bud Auto
Big Bud Auto is an indica-dominant autoflower with sweet, fruity and skunky flavours, suited to beginners and cool or temperate climates.
From $89.00
Biscotti
Biscotti feminised seeds offer an indica-dominant profile with sweet, cookie-like, spicy and earthy flavours, flowering in 8–9 weeks.
From $79.00
Black Cherry Soda
Black Cherry Soda is a feminised, sativa-dominant cultivar with sweet cherry, strawberry and tropical flavours.
From $89.00
Black Domina
Black Domina feminised seeds offer a 95% indica profile with earthy, spicy, pine and berry flavours, suited to intermediate growers.
From $99.00
Black Jack
Black Jack feminised photoperiod seeds offer a balanced 50/50 profile with earthy, floral and peppery flavours, suited to intermediate growers.
From $79.00
Black Jack Auto
Black Jack Auto is a beginner-friendly autoflower with balanced sativa and indica genetics, plus sweet berry, spicy and incense notes.
From $89.00
Black Runtz
Black Runtz feminised seeds offer a balanced hybrid profile with earthy, fruity, pine, sour and spicy flavours.
From $99.00
Black Runtz Auto
Black Runtz Auto is an indica-dominant autoflower seed with sweet berry, tropical and spicy flavours, suited to beginners.
From $99.00
Black Widow
Black Widow feminised seeds offer an indica-leaning profile with fruity, pine, skunk and woody flavours, flowering in 8–10 weeks.
From $79.00
Blackberry Kush
Blackberry Kush is a feminised photoperiod cultivar with an indica-dominant profile and sweet berry, earthy and diesel flavours.
From $89.00
Blackberry Moonrocks
Blackberry Moonrocks is a feminised photoperiod hybrid with an indica-leaning profile and berry, blueberry, lavender and citrus flavours.
From $89.00
Blackberry Moonrocks Auto
Blackberry Moonrocks Auto is an indica-dominant autoflower with berry, blueberry, lemon, skunk and citrus flavours for intermediate growers.
From $89.00
Blue Amnesia Auto
Blue Amnesia Auto is an autoflower seed with a sativa-leaning profile and berry, diesel, earthy, spicy and tropical flavours.
From $99.00
Blue Cheese
Blue Cheese feminised photoperiod seeds have an indica-leaning profile, with sweet blueberry, earthy cheese and pungent skunk flavours.
From $99.00
Blue Cookies
Blue Cookies feminised seeds are an indica-dominant photoperiod hybrid with sweet berry, earthy and herbal flavours, suited to intermediate growers.
From $79.00
Blue Dream
Blue Dream feminised seeds offer a 60% sativa profile, with sweet berry, earthy and tropical flavours and a 9–10 week flowering period.
From $89.00
Blue Zushi
Blue Zushi feminised seeds have an indica-leaning profile, with sweet, sour, diesel and creamy vanilla flavours and an 8–10 week flowering period.
From $99.00
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. ---