Does anyone ever grow a plant to harvest where the leaves all stay green the whole grow?

Or is it normal to lose yellowing lower fan leaves, and dried up brown leaves here and there and some "fall" colors in the upper leaves near harvest? Or do people really have grows where the whole plant stays perfectly green the whole time? Even my 3 outdoor plants have some yellowing fan leaves... but they're in 20-gal pots in dirt,... but they haven't even started to flower yet here in New England... so what do you think?

Maybe it has deficiencies but late in flower its normal to have some yellow leaves even if you are still feeding but I dont care everyone say you should flush which means addig no nutrient to the water just ph balanced water and if you have some dead looking leaves you should cut them