Looks like a good'un Alice.

Bettynh, I forgot to add that he also referenced uneven watering. (although I have generally tended to be quite diligent about watering.)

Just got in from scrubbing all of the porch furniture now that tree-pollen time is well past. The furniture I have was passed down to me from my aunt - circa mid to late 60's. Can't find ready-made cushions to fit. No amount of scrubbing and hosing gets the cushions looking really clean anymore.