[mdjlucan]

i noticed some leaves are going yellow any idea what is causing this i put them this year

[Goosegirl]

Never grown them but I notice the red colouration is between the veins so am thinking of a lack of some nutrient or mineral.

[mumofstig]

I'd not worry about bottom leaves dying back in this weather, as long as all the others are ok.
Make sure you keep the well watered during this drought.