My main rule w/ regards to outdoor plants don't add fertilizer unless you do a soil test to know what is going on, specifically, you are dealing with. It's VERY easy to really mess things up if you are flying blind. I mean, it's one thing to give it a gentle dose of macronutrients if you see issues with plants losing some green when they are setting pods, you know they are struggling. Or a bit of a calcium dressing if you get blossom end rot on pods. But micronutrients, you really need to do a soil test and address those in-between seasons. It's very, very easy to screw up plants, and even cause total nutrient lockout, if you overdo things.
Are you irrigating these with your own water? If so, have you got your own water tested?
Are you irrigating these with your own water? If so, have you got your own water tested?