mould, botrytis, bud rot, powdery mildew—these fungi can devastate a crop in days. Even after harvest, mould can leave buds with a funky flavour, making them unusable.
Despite following precautions like those in our how to get rid of mould guide, fungal spores often find a way into your grow. While solutions exist, prevention is key.
That’s why we’ve curated the best mould-resistant weed strains to help you avoid this frustrating issue. Before diving into our recommendations, let’s first explain what makes these strains unique.
What are mould-resistant weed strains?
mould-resistant strains are naturally resilient to mould or bred specifically for this trait. High resin production is a key factor, as it helps protect the plant from moisture.
Landrace strains, adapted over generations to wet climates like those in Central and South America, Africa, and Asia, often resist mould naturally. Hawaiian strains, shaped by their rainy, mild climate, also excel in mould-prone environments.
Similarly, autoflower strains from Siberia have evolved strong resistance to mould, environmental stress, and pests due to harsh native conditions.
Many mould-resistant strains are Sativa-dominant or hybrids with genetics rooted in resilient landrace strains, making them ideal for wet climates.
The Best mould-resistant Strains - Top 5
1. Super Silver Haze and Super Silver Haze Auto
Super Silver Haze is an iconic Sativa-dominant hybrid with just the right amount of Indica properties to prevail in cold and humid climates.
This strain, which contains genetics from impressive progenitors like Northern Lights, Haze, and Skunk#1, is not only mould-resistant but also incredibly potent, with THC levels of up to 21%.
After an average flowering stage, she provides abundant yields of vigorous buds that ensure a strong Haze high, which is an instant mood booster. On top of that, she offers delectable skunky flavours with uplifting notes of lemon, sandalwood, and spice.
2. Northern Lights and Northern Lights Auto
Northern Lights is an Indica dominant strain derived from a mixture of Afghani and Thai.
As a result of the powerful genetic base that underpins this variety, she is able to offer an effective defense against mould infestation, thereby ensuring high levels of protection during the entire crop cycle.
Her high tolerance to excess humidity is another factor why this strain is extremely suitable for environments prone to mould forming.
With THC levels up to 20%, copious yields, and the delicious smell and taste of honey musk and wild juniper, Northern Lights is a perfect option for those growing in wetter climates.
3. Sweet Tooth and Sweet Tooth Auto
The highly mould-resistant Sweet Tooth is an Indica dominant variety of Afghani x Nepalese x Hawaiian origin.
She offers impressive yields of quality cannabis with a sweet taste combined with fruity flavours of fresh berries, mango, and wildflowers with just a hint of earthiness and a cotton candy-like aftertaste.
With up to 19% THC, her potent effects include an almost euphoric, intense cerebral buzz and long-lasting, relaxing body stone. No wonder she is such a popular choice with outdoor growers in the more humid regions around the globe.
4. AK-47 and AK-47 Auto
AK-47 is a slightly Sativa-leaning hybrid that comes from crossing Colombian x Mexican x Thai x Afghan. This impressive heritage ensured a very high mould resistance, which makes outdoor cultivation almost always successful.
AK-47 weed seeds feature many advantages like being easy to grow, generous harvest potential of excellent quality weed as well as incredibly potent effects from which her name is derived.
This variety offers woody and sweet fruity aromas with some spicy earthiness, a slightly acidic aroma, and a distinct earthy dank smell.
Are you looking to grow some quality, potent weed in less-than-favorable weather conditions? AK-47 is your new go-to strain for cooler climates!
5. White Widow and White Widow Auto
When you talk about famous mould-resistant cannabis strains, White Widow is certainly deserving of a spot on this list. She is not only highly resistant to mould and pests but also super easy to grow, making her an excellent choice for beginners.
Being a perfectly balanced hybrid with a generous THC level of 25%, this potent cannabis strain offers a fast, powerful high, and euphoric effect. There is a sweet and sour flavour and aroma to White Widow, as well as notes of sandalwood and tropical fruit.
Accustomed to wet Dutch summers, White Widow never fails to deliver high yields of sticky resin-dripping buds, even under less-than-ideal growing conditions.
