Broccoli/cauliflower leaves suddenly turning yellow
I have never grown broccoli or cauliflower before and have them in a brand new raised bed. They seemed to be doing just fine and had been transplanted 3 weeks ago. Today I went outside and the lowest 2-3 leaves have turned almost a golden yellow color. It happened overnight. I had 2 on the outermost edge of the bed not do well and slowly die over the past 3 weeks. Any ideas? I did add some epsom salts to the bed about a week ago...did I kill em? Any input will be helpful. Also over the past couple days we have gotten a lot of rain.
BTW, I don't know if it is broccoli or cauliflower or both since my permanent marker wore off before transplanting and I got them mixed up.