It surely can. Mother Nature is over-watering many of us this year and yellowing of leaves is common.

There are other possible causes such as nutrient deficiency but with all the rain I'd put my money on the water cause.

Dave

I was taught at my job at the nursery a couple of years back that too much water washes away the nutrients, especially in pots, and that deficency is what causes the yellow leaves. I forget if it is iron or nitrogen, but either way a little bit of blood meal supplies both and will perk things up again, I think. We've actually had two whole days in a row without any rain! Maybe there is hope for my onions and garlic yet!!!!

Cheers!

Sunni