Made the mistake of planting two autos and one pho...

Move your photoperiodic plant into another pot so you cann add flower nutes to your automatics.

Easy, Take you photoperiod out of there and transplant into a 7 Gal minimum fabric pot. She has time to grow so might as well make her a beast 👌

Pull the photo period since its still in veg. It should handle a transplant well enough. They're already filling up the top of the container with foliage..imagine how crowded the root zone will be. Nutrients aside, i think they'd still end up choking eachother. So I would still keep your plan for vegging and then flipping after the autos, just in a different pot.

I would personally scrap the photo and focus on the autos in this situation. The photo will probably need more food than the autos so it will be the first challenge. Also vegging it for 10 to 12 weeks is going to get huge unless you do some drastic topping and chopping on it. The possibility of issues with this is endless and it might lower your quality and yield on the entire crop. You can flower the autos at 12 hours but probably end up with a lower yield. I would personally try to transplant the photo and if it doesn't make it you will still end up with better crop with just the 2 autos. Good luck with whatever you end up doing on it!

So Top the autos a couple times to slow there growth down to give the photo a chance to grow out a bit before the flip. During the first 2 weeks of flower plants will still be on a veg nute diet. On the 3rd week of flower for the autos flip the light to 12/12 and then you can change the nutes up to flower to coanside with the photo plant. That's what I would do in my opinion

I think your approach of flipping the light schedule after harvesting the autos is the right one. If they are sharing a light you can train the photo plant with LST to keep it from over growing the autos, or getting light burned. For nutrients there are a few options. You could use an all in one nutrient like Megacrop which is great for veg and flower. You could also top dress amendments instead of using liquid nutes so you could ammend the soil around the various plants according to their need. If you want to give them all the same liquid flowering nutrients, consider using a bit of alfalfa meal or blood meal as sources of nitrogen, just around the photo plant, working those a few inches down into the soil. Hope this helps!

Hi mate I'm afraid that is going to be a problem unless you grow them all with a 12/12 lighting schedule Otherwise the photo plant will just continue to veg Get too big for your container and cause problems for your two autos. Also as you have mentioned you would be using nutrients suited for flowering the photo plant would not be getting it's ideal nutritional intake. Can you possibly very gently transplant the photo into a seperate pot where it can be continued to veg and flipped to 12/12 when the autos are done. If you go down this road remember to transplant just prior to lights off to minimilise stress Hope this helps mate