Mold Resistant Marijuana Strains [Top 5 Picks]

New and experienced marijuana growers alike will understand the frustration of mold. You put a lot of time and effort into your crops, only to find them decimated by mold. And there’s simply nothing you can do about it! Once your crop goes moldy, it is unfortunately lost.

Mold, or bud rot, can be heartbreaking for growers. It can spread throughout your entire crop in just a few days, sometimes before you have noticed the beginnings.

Mold is common both indoors and outdoors. It typically occurs in hot, humid climates. Humidity can prevent evaporation of water, which is what leads to mold. As a result, mold can occur in outdoor grows with a humid climate, or in greenhouses with poor ventilation and air circulation.

You can often avoid mold growth in many situations. But if you’re growing strains that prefer a humid environment, then you sometimes need to exercise caution. For novice growers who are just getting the hang of things, you might want to try strains that are naturally resistant to molds.

Cannabis strains with a high resin production can be mold-resistant, removing the need for you to worry about spores damaging your growth. Below, we check out five of the best naturally mold-resistant strains. If you’re a cultivator looking to get rid of the risk of mold in your crop, then read on!

#1 – Super Silver Haze

  • Flowering Time: 9-11 weeks
  • Effects: Body high, relaxation, energy
  • Grows Best: Indoors

Super Silver Haze is a well-known, sativa-dominant strain that’s known for its glittering layer of trichomes. The high resin production of this plant is likely what makes it so mold-resistant, which is great news for inexperienced growers.


This strain has a sage-like, skunky aroma. This aroma is one it inherits from its lineage, which features other famed strains like Haze and Skunk No. 1. The sativa elements of this strain ensure that it delivers a burst of energy, while the 30% indica genetics also provide a body high that relaxes you.

In terms of growing, Super Silver Haze prefers a hot, equatorial climate. However, many users prefer to grow it indoors. A hydroponics set-up serves this strain well, but note that it may also decrease the flowering time.

Typically, Super Silver Haze is ready for harvest in 9-11 weeks; the later you harvest, the more resinous trichomes you get. By the way, indoor harvests will grant you a higher yield, with about 19 ounces of bud per square meter. Outdoor crops may produce around 15 ounces in the same space.

#2 – Power Plant

  • Flowering Time: 7-9 weeks
  • Effects: Energy, social, increases appetite
  • Grows Best: Outdoors

If you’re looking for a quicker turnaround than Super Silver Haze, then look no further than Power Plant. This epic strain is a powerhouse, packing 15% THC and 2% CBD on average.

Famed breeders Dutch Passion Seed Company bred this strain from South African genetics. It has been around for some time, released in 1997. It continues to impress, even taking home first prize in the Sativa category at the 2016 Life Expo in Vancouver.


Power Plant has a spicy, woody taste, but its smell isn’t particularly pungent. This combination makes it a pleasant strain to enjoy. It’s also a great choice for growers thanks to its mold-resistant qualities and its enormous yield sizes, pushed even further by the quick flowering time.

You can grow Power Plant both indoors and outdoors, and there are advantages to each method. Indoors, you receive a quick turnaround of just 7-9 weeks before the plants are ready to harvest. Outdoors, you have to wait for the right growing season; your plants will flower in the middle of October. However, the outdoor yield is far greater.

Indoors, you can anticipate a yield of 21 ounces per square meter. Outdoors, you may receive a whopping 35 ounces! That’s incredible!

Either way, Power Plant is easy to grow because it flourishes in standard soil. It’s a consistent strain that’s a real treat for cultivators, thanks to its simple growth and high reward.

#3 – Stress Killer Automatic

  • Flowering Time: 11 weeks
  • Effects: Stress-relief, clear-headedness
  • Grows Best: Outdoors

With a parentage of Lemon Haze and Juanita La Lagrimosa, Stress Killer Automatic is a citrusy, lemon-filled strain. It’s a delicious and tangy strain that offers beautiful effects thanks to its balanced cannabinoid content.


As you can guess from the name, Stress Killer Automatic is enjoyed by MMJ users due to the relaxing, stress-busting effects it causes. The THC content is 11%, which is fairly low compared to many other strains, and there is also a little CBD.

Whether you grow indoors or outdoors, Stress Killer Automatic takes around 11 weeks to flower. It’s not too difficult to grow, and doesn’t require a lot of complex skills. Nevertheless, you should tend carefully to your buds just as you would any other strain. You can grow Stress Killer Automatic outdoors if you live in a warm, sunny climate.

Although Stress Killer Automatic flourishes both indoors and out, you will receive a higher yield with an outdoor setup. Indoors, you can get about 4 ounces per plant, while outdoors, you can push towards 6 ounces.

#4 – Durban Poison

  • Flowering Time: 14-16 weeks
  • Effects: Energy, spacy, uplifting
  • Grows Best: Outdoors

Durban Poison is another famed weed strain. It’s a 100% sativa strain, which is a rare sight these days. As a result, you can expect the typical mind-focused, energizing, positive effects that any good sativa brings about.

The taste of this strain is wonderful, combining sweet notes of vanilla with a tang of orange citrus and a hint of spice. The smoke is even creamy, which is probably what contributes to Durban Poison’s popularity.

Durban Poison grows exceptionally well, producing a thick coating of trichomes that create lots of sticky resin. The buds are enormous, so you probably shouldn’t attempt to grow Durban Poison if you’re attempting to be discreet. Growers looking to cultivate just one plant may want to try their hand at Durban Poison before moving onto a full cannabis garden.


This strain is pretty resilient to weather conditions as well as mold, so you can grow it both indoors and outdoors. As a sativa, Durban Poison can grow to lofty heights; it can reach a wobbly seven feet! Unless you have a tall greenhouse with enough space, then outdoors may be the best option for this strain.

Furthermore, it produces more buds outdoors. You may find a 16-ounce yield per plant when grown outdoors, or 13 ounces per meter squared indoors.

There are a few handy tips for growing Durban Poison, such as adding human urine during the vegetative stage. Yes, you read that right! A mixture of urine and water can fertilize the soil well, leading to a healthy plant and high yields.

#5 – Moby Dick

  • Flowering Time: 9-10 weeks
  • Effects: Energy, relaxation, uplifting
  • Grows Best: Outdoors

This whale of a strain can knock you off your feet if you’re not careful! Moby Dick can pack up to 27% THC, and with barely any CBD to speak of. As a result, the dizzying euphoria you feel after lighting up with Moby Dick can overwhelm you if you’re not careful.

Moby Dick is not the strain for new smokers, but it can be handy for new growers. Nevertheless, you will need to learn to practice trimming. As a 75% sativa, it grows better outdoors because it can become quite tall. Outdoor plants also thrive in sunny, Mediterranean climates. If you choose to grow Moby Dick indoors, you may need to have a little experience in controlling lighting, ventilation, and temperature.


This strain has a relatively short flowering time of 9-10 weeks. Grown outdoors, it will bloom at the start of October.

The good news is that Moby Dick provides a mammoth yield. Indoors, plants will yield around 23 ounces per square meter. However, outdoor crops can provide you with up to 53 ounces per plant – that’s enormous!

Moby Dick is a marvelous strain to try your hand at growing if you want a little more of a challenge. Although it’s resistant to mold, you will need to practice topping to get the best out of your plants. If you get this right, the reward is worth it.

Final Thoughts on Mold-Resistant Cannabis Strains

Mold is the bane of many marijuana growers’ existence. Rather than letting it get you down, you can make your life a little easier by buying mold-resistant strains. The strains in this list are just five of the best picks for mold-resistant cannabis, but there are plenty of others out there.

Although the majority we mentioned here grow better or offer higher yields outdoors, you can grow all of them indoors and out. For sativas like Durban Poison, though, you’ll need to have a large space and practice plenty of topping.

Hopefully, you’ll have some fun growing these strains. If you’ve tried it, let us know how you found the process in the comments!

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