Not sure if this will help or not, but alot of times our stuff in containers “bronzes up”, esp if we are watering a lot b/c of hot weather or if we have a hurricane w/ a lot of rain. It’s a lack of potash usually.
Fertilize. At the garden center where I work we use miracle gro, acid miracle gro, and epsom salt—1 tablespoon of each to 1 gallon of water. It may take several days of this but you should notice them greening back up.
We have really hard water here, so you may have to adjust accordingly. :)
Went to one of the best greenhouses in the area and bought a bag of potash. All the fertilizers I mentioned are mixed in the soil of the garden pots. Will use the potash according to the directions on the bag next time watering is needed.