I've grown Tromboncino and used them as a summer squash, but the production just wasn't adequate and we prefer the flavor Tatume and Lemon squashes. I thought the same thing you suggest about crossing Tromboncino with another variety, but from what I've read the cross species cross of C. Pepo with C. Moschata (Tromboncino) is not possible for a home gardener. Something about embryo transplanting or culturing or something to that effect was necessary.
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