Answer: Based on your description I am not sure if you are thinking of a cucumber, a gourd, or a summer squash. Many vining members of this group can be trained to a trellis and a zucchini for instance that is left on the plant overly long can reach baseball bar proportions. However, there is an oriental cucmber that is paler green and grows eaily over a foot long and is slim and elongated. Maybe "Palace King Hybrid" is what you are thinking of. "Green Knight" also can exceed 18 inches long if left on the plant but is a darker green.
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