Green tomatoes are just unripe normal tomatoes (Lycopersicon esculentum). Cherry size or larger are normally used because they are easier to slice, which is why smaller tomatoes are not often seen. They can be found any time tomatoes can be grown - spring and summer, and sometimes in the winter closet to the equator, or where growers have a greenhouse or sun lamps. Add for Green's produce, it's best to call them to see what is in stock.
A little early for those
They had them when we went.
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