I have some great looking sugar peas over on the west side of my garden:
But on the east side they are stunted, short, small leaves, and started to yellow a bit at the base about two weeks ago:
I do know that the soil on that side is not as good as the soil on the west end. The soil here is a bit more clay-like--sort of halfway between loam and clay. Another issue I've had on this side is a few wire worms. I set out potato traps, and don't usually catch a great deal of them--as few as one, as many as 8 or 10. It varies. I've gone out and checked the traps and found nothing before. I check them once a day.
Do you guys think it's just the crappy soil? Should I feed them? I read that feeding them in the growing stage will just make pretty foliage, resulting in fewer fruits.