How can I prevent mold when growing cannabis outdoors in a humid climate?

[Getglass.us]

Hi Guys, Can yall help me with this, How can I prevent mold when growing cannabis outdoors in a humid climate?

 

[Tracker]

Welcome to FC.

What is your climate like?

First step is the genetics. I usually grow hybrids. Pure indicas are too dense, and late season humidity/precip leads to mold on fat colas with dense flowers. In my experience, anything with big, fat, dense colas is more prone to mold/rot.

Trim off large fan leaves and clean up the lowers to allow more airflow through the canopy. Any moisture needs moving air to dry it up as quickly as possible. The moisture can be from the environment or from the plant's own transpiration.

Prevent buds from laying/leaning on each other. Wherever that happens, it makes a place for moisture to gather, and it doesn't evaporate quickly. Use poles and/or trellis net to space out the branches

After any precip has finished, I shake the plants to get water drops off. Hold the main stem and shake it, just not too hard so you don't damage the plant.

Use a leaf blower to blow off moisture. Don't stand too close when you do it, and don't keep the blower aimed at the same area for too long. It can definitely snap a branch. Stand back and wave the blower back and forth to blow off moisture.

Use oscillating fans or box fans to make more air movement around the plants. Just position them strategically, so you don't blast the plants too hard.

It's all about getting the moisture to evaporate as quickly as possible. Airflow is key.

 

[100th Monkey]

hi @Getglass.us Green house have a strain called AMS which stands for anti mould strain - the answer is definitely in getting the right genetics to better your odds of not getting mouldy flowers and following good practices as outlined by @Tracker

 

[apolos]

I use silica to protect my plants. It basically acts as a shield on the surface of the leaf, never allowing the spored to penetrate nor invaginate the plant cell wall. Below is the product I lie to use but any bioavailable silica will do. I would also do my own research, if I were you, on the effects of silica on powdery mildew. hope this helps.

https://www.amazon.com/dp/B07CX36LW8?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

 

[trader]

cinnamin?

 

[IC Glass]

Hi Guys, Can yall help me with this, How can I prevent mold when growing cannabis outdoors in a humid climate?

To prevent mold when growing cannabis outdoors in a humid climate, try to choose strains that are resistant to mold and make sure your plants have good airflow around them. You can also space the plants out more to reduce humidity and consider using organic fungicides as a preventive measure. Lastly, keeping the area clean and free of debris can help a lot!

 

[Salvatore1970]

Hi Guys, Can yall help me with this, How can I prevent mold when growing cannabis outdoors in a humid climate?

Start buying plants that are mold resistant. Or buy plants that grow in humid conditions. Right on brother. Good luck.

 

[BainMoos]

I had the same issue and found spacing out my plants more and trimming lower foliage helped a lot with airflow. I also started checking them daily after any rain. If you're in the UK and wondering about rules around growing or using CBD, here's a solid breakdown: https://releaf.co.uk/education/cannabis-legislation/laws-regulations/cbd-legality-in-the-uk-understanding-the-regulations. Keeping legal stuff clear is just as important as dealing with mold.

 

[Fenyajaddy]

I stick to strains known to handle damp weather, thin out inner growth so air can move, and shake off excess moisture after heavy dew or rain. A cheap box fan on a timer near the plot helps more than you’d think. I’ve also learned a lot from growers who work with things like bulk cbn distillate, since they often share tricks for keeping flowers clean and dry.

 

[umixe929]

I know this is from 2024, but it popped up while I was looking back at outdoor grow logs getting ready for the summer season. I dealt with this exact mold problem for years. No matter how much I spaced out my plants or defoliated, a late-season rain would always invite bud rot. I eventually decided the constant stress of fighting the climate wasn't worth the lost yields.

I stopped cultivating my own and made the transition to the legal clinic route. It is a completely different experience when a specialist handles your treatment and provides a regulated prescription only medicine. You never have to worry about powdery mildew or losing half your supply right before harvest.

 

[rocknroots]

I think the biggest thing in humid climates is accepting that you’re never really eliminating the risk, just reducing it. Genetics and airflow seem to be the two biggest levers. Loose-structured, mold-resistant strains, good spacing, cleaned-up lowers, and checking after rain/dew can make a huge difference.


I’d still rather prevent moisture from sitting in the buds than try to fix mold once it shows up. Once rot starts, it’s usually too late for that flower.