8 Resilient Mold Resistant Cannabis Strains for Wet Climates

Growing cannabis in wet humid climates is a challenge without some good mold resistant strains. Thankfully there are hardy, resilient weed strains that can fully finish flowering in rough conditions – even outdoors in the pouring rain.

wet climate mold resistant cannabis cultivation
Wet climates provide a challanging, but possible experience.

Why Mold Resistant Strains?

Have you ever dealt with pounds of moldy weed?

Plants soaked, buds mushy and trashed, covered with grey-blue mold and black bud rot. Only to harvest and bring them inside to further multiply the problem.

Many cannabis growers feel it is impossible to produce buds worth any value in such wet weather. They will be stuck pulling plants well before they are finished flowering, and justify doing so by the bad weather. Early harvesting will produce shrunken yields and scrawny, undeveloped buds that are difficult to market.

Here in Hawaii, we are faced with some of the rainiest, most humid conditions in the world. The town of Hilo, Big Island, Hawaii has an average of 126.72 inches (3,220 mm) of annual rainfall between 1981 and 2010, with with 275 days a year getting rain. It has the most amount of rainy days per year in the northern hemisphere.

Yet, people are producing amazing marijuana outdoors in Hilo, Hawaii.

How so?

It may come to you as a surprise that there are cannabis varieties adapted to wet conditions, and can even thrive in them!

Many types of marijuana have been bred in such humid and rainy environments for generations. Through this, the plants have built up a natural resistance to the climate, in order to make it through their flowering process long enough to mature seed. There are some great mold resistant cannabis strains you can buy as regular and feminized seeds now in 2020!

cannabis field colombia outdoor
Credit: Nicolas Enriquez

Landrace Strains

A landrace is a marijuana strain bred naturally by seed in an area exclusively for many generations, that has not been crossed with another variety. Inbred, the cannabis genetics learn how-to adapt to the local environment, and prove to be stable, relatively uniform genetics for seed breeding.

Landrace plants produced from seed are themed closely similar to each other, and are ideal for breeding programs – often producing solid, vigorous and resilient hybrids when crossed. Some popular examples of landrace strains are: Panama Red, Vietnam Black, Afghan Kush, Morrocan Hash Plant and Thai Sativa.

Wet Climates: What you want to look for in a mold resistant, hardy strain is a genetic background from a wet climate. Parts of SE Asia, South America, Central America, even certain parts of Africa all have wet climates where marijuana has been breeding for many subsequent generations.

Landraces originating from the wet areas of the word will often possess the traits that hold resilient qualities. Mold resistance, vigor, hardiness, resistance to common pests and diseases, and genetic stability are to be found in these treasured genetics.

Durban Poison


durban poison strain outdoor mold resistant

Durban Poison is a 100% sativa inbred, never hybridized landrace originating from South Africa. Strong and hardy seeds and plant, exceptionally resistant to mold and disease. Flowering time is short for a sativa, 8 – 9 weeks  which makes her suitable for all kinds of growers.

Durban Poison gets huge outdoors and reaps wonderful fat bud harvests, even in awful weather. Durban has been around since the 70’s and still competes in today’s market with her high quality buds.

Smells and tastes like a minty herbal spice, a Durban delicacy. Fast flowering time, impressive yields and outdoor resilience equals prime outdoor cash-cropper.




 Brazil Amazonia


brazil amazonia resilient weed strainThe search for a mold resistant indica is over. This variety is a pure indica strain collected from the Amazon rainforest. Buds are rock hard and dense, with a citrusy smell and flavor.

Brazil Amazonia finishes swiftly and stacks up like concrete. When vegged under lights she will finish before 8 weeks. Big yields for all kinds of growers, indoors and outdoors. A vigorous, fast growing strain that performs well in clone rotation set-ups.

Rewarding, top quality outdoor grow operations have been pulled off with Brazil Amazonia seeds. Mold resistant and easily marketable, Brazil Amazonia is a true performer.


Colombian Gold


colombian gold landrace resistant cannabis strainColombian Gold is a legendary landrace sativa originating from the Santa Marta mountains of Colombia. This strain is a major foundation of all modern cannabis genetics, the infamous Skunk #1 seeds originating from Colombian Gold as well as countless others.

An original beaster, Colombian Gold comes from a high elevation and can handle harsh weather with strength. Mold and pest resistant. Colombian Gold seeds were used by Simon Bolivar as he traveled around the Amazon rainforest trading spices and medicinal plants with natives during his conquests.

Musky, spicy, fruity – Colombian Gold is a savory smell and smoke. Naturally titanic; don’t be surprised when harvesting multi-pound plants.



Thai Sativa


thai saitva mold resistant strains outdoor huge

Thai landrace sativas grow larger than nearly any other strain, photosynthesizing into freaky gigantamongus trees. Ultimately mold resistant and long flowering, growing a Thai pure sativa is not for the faint of heart.

Many phenotypes of Thai seeds will not finish flowering until January. The general masses who try growing a Thai sativa can not wait that long (for various reasons), and end up harvesting the plant early – thus giving Thai strains a false reputation for scrawniness.

If finished correctly (which is challenging when outside a tropical/sub-tropical climate), seeds will evolve into arm-sized colas that droop down requiring staking. Thai has the potential to be the all-time heaviest yielding strain. Her fully finished buds are big, hard and competitive. The smell is unique to SE Asian sativa strains, often resembling rotten fruit and anise.



Hybrid Strains

The offspring of two ganja plants with different genetics is called a hybrid.

Although plant genetics are not immediately stable breeding once a strain is hybridized, hybrid strains can have many advantages to the grower:

A hybrid can have the bud qualities of an indica while taking taking the bigger stature of a sativa. Often hybrids have what is called “hybrid vigor” and out-perform both of their predecessors in growth speed and yield while shortening the sativa flowering time.

Hybrids make up most of the genetic stock of cannabis nowadays. Nearly all popular modern strains are hybrid such as: Blue Dream, OG Kush, Diesel, Girl Scout Cookies, Trainwreck, White Widow, ect…

When searching for a suitable hybrid, always look at the parents. For best defense against wet humid climates, find strains that are bred from mold resistant or rainy climate landrace strains.

Well-bred hybrids made from landraces or hardy inbred strains most often perform better outdoors than the over-hybridized alternatives (however, there are some exceptions).

Orient Express


orient express hybrid strain of weedOrient Express is a mix of the legendary Vietnam Black crossed with a Yunnan Chinese indica. Soaringly high bud production when grown correctly, experience obese buds on a compact indica bush structure with a shortened flowering time.

Vietnam Black is renowned for its incredibly strong psychedelic high – described as extremely intense, even frighteningly mind-bending…the kind of weed you smoke at a party and everybody goes home. Orient Express retains the intensity of the Black, but a little more relaxed with the addition of an indica. Musky floral smell and taste – the smoke is incredibly smooth, easily being able to enjoy BIG hits.

Orient Express will hold up to any weather conditions, mold issues are non-existant, an ideal wet weather strain. The buds are utmost quality grown outdoors as well as indoors, be sure to finish Orient Express all the way til the end for an enchanting Asian surprise.



Super Silver Haze


super silver haze strain-plantOriginating from classic inbred strains Skunk, Northern Lights and Haze, growing Super Silver Haze will blow your mind with drooping, colossal flowers – plants require staking the buds get so big and heavy.

Yields exceptionally fruitful and grows into giant plants; grow Super Silver Haze seeds outdoor and be flooded with killer pot. The price you pay for these fat harvests will be the longer flowering time – but – for the wait will be rewards in the form of dankness.

SSH performs well resisting mold and disease. Be sure to provide soil with loads of nutrients while growing Super Silver Haze, in order to pump the maximum bud growth from these monsters. A confusing high. Enjoy having loads of glamorous, sweet silver buds with a taste reminiscent of sugar-cane.



Strawberry Cough


strawberry cough strain-budWith mysterious genetic origins and a taste to die for, Strawberry Cough handles the bad weather intriguingly well. Strawberry Cough has proven itself through guerrilla growing in poor, wet conditions with days of rain, much surpassing expectations for a strain so notoriously grown indoors.

The flavor of Strawberry Cough most certainly lives up to its name. Incredibly sweet, literally tasting just like strawberries, anyone who gets a sample will instantly be hooked.

While not the insane heavy yielder, with proper care Strawberry Cough seeds turn into large plants outdoors, producing ample amounts of bud off each plant. Provide additional lighting on an extended vegetative cycle, and prepare to be supplied with a solid amount of amazingly fruity pot.



Power Plant


power-plant mold-resistant cola-plant strain

Power Plant seeds are descended from South African dagga genetics, obtained in 1997 and hybridized for increased yield and bud formation.

This strain is an ideal cash-cropper, enormous-sized competitive quality buds on hardy plants that will handle rough outdoor climates. Power plant’s flavor has been described as a “sativa that tastes like kush” with a pungent, musky smell. Insane yields from easily clone-able plants, Power Plant is perfect for your outdoor or indoor grow operation.

Flowering is short for this mostly sativa strain, only about 8 weeks. Seeds grown are very uniform, producing marijuana with great bag-appeal. Power Plant is for the serious volume cropper.


For more information on selecting mold resistant marijuana strains, visit our homepage for the Cannabis Seed Hotlist

Disclaimer: Know your laws. Check federal and state/county regulations before buying seeds online. We do not promote or undertake in illegal activity.

Read next: Top 25 Best Sativa Strains

41 thoughts on “8 Resilient Mold Resistant Cannabis Strains for Wet Climates”

  1. Aloha braddah,
    Much mahalos for this blog. This article and the “Top 10 Mold resistant…” are the kinds of info I’ve been looking for for years. So glad I stumbled into your blog. Well-written and very comprehensive. Keep it coming! Aloha, from leeward Oahu.

  2. Hey braddah, I get one question maybe u can answer. Besides the mold problem, another one that messes me up is spider mites. U guys don’t have that prob in the BI? I tried using all the stuff the mainland guys talk about on the message boards….all that kind insecticidal soaps from Home Depot and whatevs. Kinda works at first when I spray everyday, but as the plants get bigger, seems like I fighting one losing battle. I’d like a locals perspective on spider mites. Mahalos!

    And one more time: thanks for your blog! Way more fun reading about locals growing. Shoots!

  3. Nice work braddah, we need it. Hopefully my high CBD Supreme Durban has kept its mold fighting genetics after the cross.

    Mahalo nui.

  4. Aloha,

    I live on the leeward side of the big island and wanted to add another strain to your list of strains that grow well here, or in wet climates.

    Kilimanjaro by WOS.

    I never have ever had a mold or mildew problem. Grows well even in lava cinders. Lol

    Malama pono.

  5. Have my Med license on maui. Does anyone know where I could get a few seeds of these strains? Love to try the m out. I get to big island occasionally.

  6. Purple Maroc, Purple #1, Sweet Purple, Polm Gold, Passion, Shaman, Purple HashPlant, PCK (Pakistan Citral Kush), CDG (Congolese Double Gold), Arne, Viking and many more. All those strains are very fast – max 8 weeks flowering. Purple genetics are very very resistance check them out 🙂

  7. Being a grower in the foothill regions of Maine, I’ve searched for mold resistant strains high and low, lured in by this or that description about such and such a strain’s ability to withstand moisture and temperature fluctuations, which are a problem up here come September and onwards. What I’ve come to find over the years is that there does not exist a rot resistant strain, at least not any I’ve grown. They all submit to the reality of temp swings, dew, and rain. Power plant and Durban I grew last two years, and they have proven no different than any of my other plants in regards to mold and pm… They both mold up and once they get it, it justice accelerates all the same.

    • Hi Jay, I’m in a wet climate area too… I wouldn’t give up just yet tho.. I’ve had good luck with Thai strains, those Asian sativa are the best mold resistant strains in my opinion but I doubt you can find any real deal Thai strains that would finish up in time for outdoors where you’re at unless you had a greenhouse with additional lighting to bring her into Dec. WOS Kwazulu has been pretty rock solid for us outdoors in even the rainy season in Hawaii. Anyways good luck and hope you get the mold situation figured out.

      • Nice Su I like Jack Herer too, nice creamy buds. Yeah how is Maine treating you? I have a buddy up there growing and he loves it. Haven’t tried vortex yet tho looks pretty good.

  8. Hello from the wet southern oregon coast, I finally have the upper hand in this battle it does not matter the strain! AIRFLOW AIRFLOW AIRFLOW it’s all about the AIRFLOW. Lollipop the bottom third of the plant and completely remove the entire core of the plant. It sounds terrible but I’ve lost a lot because I just wanted to keep all those buds n branches thinking “amount” but losing to much to brush off to the side so I encourage any grower out there to chop the f out of one plant in the garden more than you ever have clear any and all leaf and or bud or small branch from every crotch on all the branches (ladys love a well groomed crotch) but that’s where rot starts not on the buds it starts there and takes the highway to the weakest buds and battles to the death of a lot of buds, anyway call that your tester plant and watch the difference side by side and the outcome is quality bigger tops that show you what your strains can handle and gives you the opportunity to take yourself to school and learn about it hands on (take it from this haoli growing near the beach is tough but can be done n done well)

    • Some great tips Rocky, thanks for sharing. I agree with you on most things, airflow yes, cleaning out plants yes (to an extent) however here in Hawaii the strains really seem to matter, many indica doms will get trashed with mold next to sativa strains clean as a whistle right next to them. Anyways thanks again for visiting and here are some more tips to stop bud rot, gray mold in cannabis.

    • Thanks dude. I have been fighting for a long time in Georgia and last 6 months I have been doing exactly what you are talking. I keep each branch clean till near top fighting also with 35% hyd peroxide deluded to 5% and lots air flow but what helped most is clean lower branches.

  9. For what it’s worth, since I’ve been using cannabis oil before bedtime for better sleep, I’ve acquired high levels of aspergillus internally! I did NOT have high levels before I started, because I had done an organic acids test and there was NO mold. Now in 2018 and another organic acids test, high levels. BEWARE. I need to explore this with the facility I use.

  10. If it’s humid enough airborne fungi just attack any and all parts of the plant. I’ve found copper oxychloride mixed with non toxic acrylic paint works well. Problem with defoliation is it opens up wounds on the plant for pathogens to enter.

    I prefer to remove infected sections, cut out any rotted or diseases stem tissue, seal with acrylic paint/copper mix. Doesn’t hurt the plant, keeps it going. I switch.to Foliant sprays with chelated nutrients every 3-4 days at this point. This is due to stem infection and reduced nutrient transport.

    I stop all spraying 14 days prior to harvest and coax them home. Even heavily infected plants I’ve managed to bring to maturity this way. It’s a lot of work. You need check nodes and branches, leaves and stem daily for signs of infection. Preventative maintenance Foliant spraying with a fungicide can be beneficial. However I feel airflow is paramount.

  11. Been fighting mold for 15 years here in MA. I tried many “mold resistant strains” that were NOT mold resistant at all. Last year i tried 6 mold resistant strains. The rule here has been the more frost, the more likely the mold will hit it fast. PEYOTE COOKIES was the amazing exception. It rains here every other day in the fall. Even worse is the heavy soaking dew landing on the buds every morning. Yet Peyote Cookies was almost MOLD PROOF. I gave two friends P.C. plants nearby who also had no mold issues with this strain. AIRFLOW, clearing fan leaves and useless branches is HUGE, i agree. Having the best soil will greatly strengthen the immune system of even indoor strains, outdoors (earthworm castings, good black loam and a huge hole).. Also the most DIRECT SUNLIGHT will help in about every way. I had to skirt a couple big trees. I also like THE CHURCH from GREEN HOUSE seeds. Not quite as mold proof but there will always be a couple in my garden.

    • Hi Dana thanks for sharing your experiences battling mold, I agree from what we’ve seen too- sunlight, airflow and cleaning plants are huge advantages that can save crops during the end and also healthy soil for sure helps the immune systems.

  12. Hi there,

    I have had a growroom infested with PM, almost completely… Ive grown some joystick clones and love triangle and all of them were pretty sick. But there were “accidentally” some clones of blueberry hashplant also and these plants were in the middle of the completely sick joysticks and triangles. they were overcrowded, touching and laying on each other. Blueberry had not a single leaf sick with PM. But i can not find any seeds of BH online.. the temperatures were sometimes around 31Celsius and at night around 22C. humidity around 35 – 55%.
    so this blueberry genetics is superb i guess. also buds much better and super smelly, hard, the flowers were thriving in the middle of the PM battlezone…

    • Hi Jakub,
      Funny you say that, I was just planning on getting some of those again for this year. I’ve also had good experiences growing Blueberry x Hashplants when I did last time, an awesome strain that never got mold growing outdoors in our wet climate. Seems like most places are sold out of them right now but I did find some on Seed City here.
      Good luck

  13. Growing in the uk for 15 years and always the mould issue until last year, and i found THE MOST botrytis resistant strain ever, LEDA UNO from KC Brains. It finishes late 15-31oct and some of the plants are overly leafy, but some are fantastic and all mould resistant like nothing else i have tried, great flavour too and strong sativa hit. I went back to have a look at the leftovers on the plants on 10 December last year and there was still only 10-20% mould on them, i had to go back with a bag and pick some popcorn!!! I have managed to save the two best plants as clones over winter so this year should be even better. I’m also attempting to make fem seeds from these genius plants at the moment. Who would have thought KC Brains, laziest breeder ever, i had tried other stuff of his years ago and it was all pants. He doesn’t even mention mould resistance in the write up. Happy 2019 season all !!!!

    • Awesome thanks for dropping by and sharing that, I would like to see how that strain grows in the tropical wet Hawaiian climate here. Good luck with your growing and seed breeding.

  14. Indoors humidity easy to control in Veg. Room. Light will run it off. Keep your Temp 75 or below is absolutely best mold control I have found.

  15. I have experience growing on Maui, Portland Oregon, and San Francisco. I found that if you can access the plants easily, manually shaking the water off helps immensely. Preferably just at the start of a sunny spell, even in continuous downpours. It helps quite a bit, indoors you should be able to control it by keeping moisture off the foliage and low humidity…


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