MI-grower
Hi honey!!
OK... I used Miracle Grow organic when I started my grow and with it came gnats. So from the git-go I had to fight gnats. I am going to tell you what helped me... First tho, remember that one gnat can lay thousands of eggs. So if you are seeing a few, they can repopulate quickly.
I have been using what Harry Red said worked in one of his postings, Mosquito Dunks. They are inexpensive, are shaped like a little donut, and DO NOT HURT YOUR PLANT (or fish cuz they are safe for use in ponds). You can buy them at Bomgaars, or online in places like Amazon and elsewhere.
To Use: Cut one round mosquito dunk into 6 to 8 fairly even sized chunks. Drop one chunk into each gallon of water. Let soak for 48 hours (or more). Mix 1/4 Mosquito Dunk water to 3/4 regular water. For 1 gallon, it is 4 cups Mosquito Dunk water per gallon. The chunk can be reused for a few weeks (active ingredients for 30 days).
I keep a few gallons of dunk water prepared at all times and I use it with every watering on all plants, including those in the veg room. When I use a mixed gallon, I take the used chunk out, save it, and put it back into the empty gallon, refill, and sit that gallon at the back of the line and just keep going. When the chunk is falling apart severely, I toss it and get out a new one. Also, don't worry if the chunk loses a few particles into the water jug - you don't have to syphen it off. I used it just as was (with floating particles) and had no problems with my plants.
The dunk works to kill the larvae. It does not kill the adults. Adults have a life cycle of ?21 days?. I don't remember dates for sure.. but it was a few weeks and I didn't see them anymore... so I stopped using the dunk water mix... a few weeks later I started seeing gnats again and started using the mix again... and now am not seeing them again - but I'm just going to continue using it except when I clear plants for harvest.
Most important of all - this mix works and does not hurt my plants. I am still using it.
Yer plants look fantastic!!!!!!! I'm sending good vibes to the MJ Goddess to send you girls!!!