It looks like three pots? And some very wet soil? I am not an expert, but I believe plunging only needs to be done for a minute or so, until the medium is wet, and then remove the pot from the water and allow to drain. I believe several hours is way, way too long. I think a minute or two is adequate. Sitting in water may have caused this. Yellow leaves on any plant are usually a sign of overwatering. (Brown leaves are usually a sign of underwatering.)

First of all, how do you post pictures here? Second, the link 'effects of glyphosate on tomato' left above by jean001a has a picture of a glyphosphate effected tomato plant and it looks just like mine do. To: dickiefickle, all my garden plants are planted in a garden, in the ground, except for a cucumber and a pepper. One problem I had, which is why I'm having such a bad weed problem, is that when I first decided to plant this garden, my plan was to use the rear-tine tiller owned by my landlord to till all the soil in the garden area, then to till in some bulk combo soil. However, the tiller has both a seized transmission and engine, so its useless. This meant that I had to plant the garden in what was currently a lawn area, with grass and weeds. So I planted the plants just like I would plant a shrub or perennial. I dug holes about 14"-16" in diameter, about 14" deep, then I mixed my soil up and filed these holes, then planted the plants in the holes. Before planting, I didnt spray Roundup on the garden area, because I figured my landlord would want it to be a lawn again in the future, after the garden was picked. But later, she agreed to allow me to spray it, but by that time the garden was 3 weeks old. However, the grass and weeds are still growing, so I first just weed-wacked them, but as the veggies grew larger, I couldnt take the chance of weed wacking the veggies by accident. But there are too many to pull every few days, so i did what I would normally do in an ornamental bed. I first pulled the weeds under the drip line of the veggie plants, then I carefully sprayed Roundup to the other weeds, with the wand very low to the ground, on a non-windy day. Also to dickiefickle: As far as my soil being too moist, the holes I'm growing in are 14-16" deep, and we live on the East coast where we have a drought just about every summer, where it wont rain for weeks at a time. Most watering is done by hand, and I never water too much or too often. Usually every 3 days or so, unless it rains, so the soil is never too wet for very long. However, I planted a Dahlia, a 40" variety called 'Contraste' back on about May 5. It already had a long stem growing out of the tuber, so once I planted it, it immediately was 3" above ground and started growing leaves at once. Then on about May 20, we had an extremely rare 7 day long rain spell, where it rained on and off every day, and was constantly overcast. It actually rained about 3-5 hours per day. One day after the rain ended, the sun came out and some plants were wilting a little initially due to the bright sun for the first time in 8 days, but then most plants perked back up, except for the one Dahlia. It continued to wilt for 8 more days, til I dug down to the tuber, and discovered that it had rotted from the bottom up and was slimy and easily crushed in my hands. ****Anyway, my most important question at this point is: Now that I've pruned the tomatoes back below the yellowing areas on top of main stem and laterals, will those tomatoes grow new stems from the area where pruned like most plants do(2 or more new stems), or will no new growth start where pruned, and only new lateral will grow from between the main stem and leaf branches? How do tomatoes normally react to their stems being pruned?

I was going to be making my mulch bed bigger this weekend actually but I didn't realize temps were going to be near 100 degrees so I put that off until it cools down a bit...good to know this doesn't look that bad

Not sure about changes in water quality, we are on town water and I have always used it for watering my Peace Lily. No recent house moves either and I just checked - we have both fluoride and chlorine added to the water supply. I switched potting mixes due to the aforementioned problem of yellowing leaves. Basically as a trial in a more open mix to determine whether or not I WAS over watering. I don't think I was, as all the roots were white and healthy (although rootbound). I'm debating whether or not to unpot the plant just to check the roots. But maybe I'll wait on that. I need to do a bit of research to determine whether or not I have her planted too low in the medium and if I have, I'm planning on replanting her in the correct position. I'll finish the watering experiment first though, just to rule that out.