I’m guessing they just come out of the soil. I just put sticky traps out at the first sign of them and it seems to keep them at bay. But you gotta be on it before an infestation.
I’ll be curious to see how the GH plants smoke. I’m sure it’ll be fine.
Bad coco is full of gnats.
Alot of brand over the years have just been GH in fancy canna related bottles. Emerald harvest is a current one.
The #5 is by far the best pheno of this pop. Very LIME forward with sandalwood background.
The #2 aka Golden Lady isn’t the one. I love the kushy structure of the tops but the lowers didn’t stack at all and she was incredibly hungry. Insatiable.
And lastly we have the Shitrock #2.
Smelling like mashed potatoes and a bit of sweet earth. Nothing I wouldn’t expect it smells like a swirl of the parents.
Look at all those chunky resin heads. Looking awesome!
Man that looks so good
Diatomaceous earth is the #1 ammendment you can make to fight fungus gnats in living soil. Ive literally done side by side tests during flower. They wont even come close to my plants dosed with DT. They know it’ll be certain painful death.
I add mosquito bits to my resivior and don’t have them any more, works great.
Yeah tried DE, sticky traps, BT (mosquitoe bits). Nothing worked, I must have had a super strain of gnats that year.
Hit them with nematodes too, I think they liked it. I’d cover the soil surface and the fuckers were breeding in the drain holes.
You know the only thing that killed them temporarily was isopropyl sprayed on the soil, they didn’t like that.
I have found a thing for gnats.
AC Infinity makes a self-watering fabric pot stand that works by using a rope wick to wet the fabric pots from below. Keeps your plants watered for maybe a week if not longer (the wells have 1 gallon of capacity).
Anyhow, the reservoirs are easy for the gnats to get into and they will drown in great numbers. That is a really nice side-benefit!
I tried those and ultimately found them too hard to keep clean. I do still use them to feed plants on and collect run off for testing. Nothing works quite as smoothly for that purpose. @Topdecker
Yeah, I clean them every time I fill them. I water less often, but I don’t save any time at all because of the need to clean-up. On the plus side, I keep my tent floor a lot cleaner too.
But they do nuke those dang fungus gnats. Seeing all of those little 'effers floating was pretty fantastic.
I’ve found some integrated plastic pots on Amazon that work like the AC Infinities except that the reservoir is ~60 oz and the base if only 9" across. The pot that sits on the reservoir is 12" across at the top, so it narrows as it reaches the base. The soil capacity should be around 3.5 gallons.
I have a pair of 12" pots inbound so I can get a look at them, but I suspect that they are going to be close to ideal for autoflowers in a sea of green style run. It isn’t that I dislike the AC Infinity watering solution - but they take up a lot of floor space that I want to use for additional plants.
Hang sticky traps on top for gnats and spray hydrogen peroxide on soil surface for eggs. They will be gone almost immediately.
They sell net covers for the drain holes, to prevent fungus gnats from accessing the dirt.
https://www.amazon.com/Pack-Flower-Hole-Mesh-Drainage/dp/B0CJ29V2HV/ref=asc_df_B0CJ29V2HV/
That’s just one more reason why I like fabric pots. No drain holes!
If you use fabric pots and cover the top of the soil with something like gnat-nix (sold by growstone, it’s glass stone, basically) or sand, it takes away all access points for the gnats to get to your soil. The gnat-nix is reusable too, which is nice.
Diatomaceous earth works, but you more/less have to reapply it every time you water. Once it’s wet, it’s not really effective anymore.
Their 3 part is similar to GH, but their 2 part Cali-pro line is definitely different. More potassium for sure.
I’ve run both lines extensively and preferred the Cali-pro 2 part. It runs very clean (little to no salt residue), it’s affordable, you only need 3-5ml/gallon and it produced excellent results with just the 2 part and no additives. I did try their bud booster once and it was good but not worth the money IMO. Liquid koolbloom worked just as well for me.
Super frosty plants from that EH 2 part. Very similar to canna aqua, but better bud structure. You should give their 2 part a try sometime man.
So yes you are correct I had to cover the bottom of my plastic pots with women’s nylons. Large size 
That stopped entry to the drain holes.
But these little bastards were resourceful.
You know how the soil shrinks away from the sides of the pot in between waterings?
Well they went down the sides and party on again. More breeding. I was ready to nuke my whole grow. I ended up tolerating them until the end. It didn’t help that the plants were 20 + week sativas. 
This is a gnat annihilator .
