Hey BB,
The pH in the pots needs addressing, no matter how much Iron you add, if the pH isn't correct the plants won't take it up. Test the soil pH, but looking at the photo’s I think you’ll find it’s alkaline and could do with the addition of some Iron sulphate (by Manutec, from Bunnings or garden centre)… this should kill two birds with one stone.
It may not be all pH though, the pots may be too small to maintain a decent root zone temp this time of year, especially if they're plastic, and especially if they're sitting on concrete or pavers. If the root zone is too cold, no matter what the pH is, or how much Iron or "Urea" you add, the plants will not green up.
If you transplanted them into larger, preferably terracotta, pots and kept the soil pH good, they'll have half a chance, or sit the pots directly on dirt where the roots can penetrate down into the surrounding soil, they'll be able to get down to a warmer zone and the pH/nutrient availability may be better than that in the pots. When you want to transplant them, cut the roots that have gone down through the bottom of the pot into the soil, one third around the pot at a time, leave it for a week, cut the next third, then the last third another week later, then move/transplant.
Cheers.
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