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So, one side is nice green with white dots as usual, but the other side (the side on the less blurry part of the picture) is yellow instead of green. Is this some disease? I've gotten normal looking zucchinis out of this plant before.

Zucchini two sides

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  • I can't answer your question, but I'd certainly recommend picking it so the plant can work more effectively on new zucchinis. Jul 24 at 3:32
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I can't say definitively, but if it's growing just fine then I would let it grow to maturity and save the seed to see if the mutation is stable on its offspring. You could have a nice mutation for a new variety on your hands!

Yellow fruit is a normal gene on squashes in general (zucchini is a squash). It could be that something in the environment caused a recessive yellow gene to trigger on the part facing the sun (it's usually the other way around!) There are some yellow-green, bicolor zucchinis that are really pretty. If you're lucky, this could be the start of a new heirloom.

What does the transition between the two colors look like?

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  • You can see on the upper left part of the zucchini a part of the transition Jul 26 at 16:23
  • I see now, was hoping for a more stark contrast but still interesting. As an aside, my zucchinis tend to get a little weird as they age too, so maybe these things just happen as they age. One of my weird ones this season is bulgy at the end almost like a gourd.
    – Josh
    Jul 26 at 17:16

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