Hi Salt, I know this is an old thread, and I can't answer your question about what causes it, but I'm noticing it myself this year. We have three rows of tomatillos, and a few plants are a lighter shade. All grown from the same seed as last year... maybe I didn't notice it last year due to them being planted in with some tomatoes, but this year it's noticeable. If I can figure out how I'll get a picture up tomorrow.
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