Hi, Please go easy on me, this is my first grow and I don’t really know as much as maybe I should.
I’m growing outside in soil, compost, perlite, vermiculite mix, feeding worm castings and bat guano.
It’s wet season here in Thailand so we’re having a lot of rain and some of the flowers on one of my plants has started turning brown.
Is there anything I can do?
That my friend looks like it could be bud rot. If it is, you need to do a 50/50 hydrogen peroxide and water spray, aoray the entire plant especially the effected areas and cut away all those brown buds asap to stop it from spreading, if it is bud rot and you haven’t sorted it soon as possibly the whole plant will be effected and then will have to pulled out
Should I move the affected plant out on its own, I’m growing outside but under a small polytunnel as it’s raining a lot. Should I spray all plants to be sure? How long before harvest can I spray plants and should I then ‘wash’ the buds to remove any residue?
Sorry for all the questions
@Sketchpad I agree with @Se7en Looks like a pretty bad case of it too unfortunately.
Cut it out. Your plants won’t be pretty when ur done btw. Spray with the peroxide as mentioned and carefully check the rest of your plants.
Once it starts it spreads very quickly.
Can you roll up the sides a bit on nicer days. Or maybe add a fan in your tunnel to get some air flow ?
You could pull a few of the bigger leaf to help with air flow as well.
Good luck.
Thanks a lot for the replies, I’ve moved the one plant that is obviously affected out of the tunnel. Will check the others over tomorrow when it’s light and split them up as much as possible. We’ve just had 4 days of solid rain so it’s not been ideal at all. I have picked the worst possible time to grow as it was legalised here right in the middle of the rainy season, wanted to try as low-tech as possible approach and couldn’t wait for December when the weather would be better.
Ordered another lot of seeds that by the time they arrive shouldn’t start flowering until after the rain ends so hoping that I can salvage something from my first try.
I’d imagine if it’s raining heavy there’s also high humidity which is also what caused it, defo agree with @Oldguy need to get some decent airflow in that tunnel 
Hope you get it sorted keep us updated
Welcome to the community. So sorry you are having such issues 
. 
The humidity underneath the tunnel must be through the roof for bud rot to start that early. Do the trimming and cleansing as mentioned. Some how you have to open up the tunnel and get lots of air moving through it.
Before you try cutting out the affected parts I suggest spraying with the peroxide solution first. This will help decrease the amount of spores that can be spread when the plant is disturbed. All affected parts of the plant should be removed. It’s not consumable.
Hope you can salvage some of the crop.
Good luck
During flower you only want 45-55% rh could prolly take em out of the tube.
I’ve moved all the plants out into the sun today and will keep them under the eves of my house, for now, to improve airflow and have them out of the tunnel. Have sprayed and trimmed off the affected parts so now fingers crossed I can end up with something.
Definitely, lesson learned, will avoid the rainy season next year or have a bigger tunnel with better airflow. I just got a bit over-excited when it became legal here and ordered seeds without thinking!
So far so good 
I’ve had to cut out a tiny bit today but seems like it’s slowed down and the spraying worked. We also had 3 days of sunshine in a row which has definitely been on my side. Not counting my chickens yet but just wanted to say thanks for the advice, so far it seems to be working 
