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I didn't grow other squash, and neither did the other allotments around me, so there should not be any cross pollination.
My fave is a summer squash 'Zephyr', real nutty goodness.
?? Vaca. Why can't you keep piacentina seeds?XX Jeannine
My absolute favourite two are Delicata Sugarloaf and then the Kuri. I am not a lover of Butternuts, Turks Turban I would personally class as an ornamental, you can eat it if course, but there are so many others with a better taste. I also am not keen on the spaghetti squashes.I think it depends on what you like.I like sweet almost nutty flavour to squash, with a dry firm flesh that is not stringy, I want it to puree down to the texture of cream.I am also not a big fan of most of the courgettes or summer squash, but they do serve a different purpose. Crookneck summers have a more defined taste though.If you like courgettes, chances are you will like spaghetti squash, it lacks the flavour that I like and is much less dry, more like a marrow.For pumpkins, well I grow many, mostly for decoration, I do make pumpkin pie but I only use a few varieties of pumpkin to do that, most lack flavour and texture however with sufficient seasonings they can make a good soup.For others that suit my taste, most of of the Japanese are excellent like Futsu and Chirimen but not Toonas Makino, all of the Delicata types, egSweet Dumpling, Sugar loaf,the potimarron family ( tastes like chestnuts) the buttercups, Triamble,Musqee ge Provence, the Australian blues especially Jarrahdale and Crown or Crown Prince, the bananas especially Blue, Marina de Choggia . Some of the acorns eg Thelma Saunders, and I love jack be Little Pumpkins and for pies Small Sugar or Sugar PieNot for eating I would say, most of the large pumpkins, keep them for carving,especially the Cinderella AKA Rouge Vif d'Etampes,(beautiful to look at though) the turbans, some of the cheese family,most are purely decorative the exception here is Musquee de Provence which is a delight to eat.However having said all that my advice is to grow and compare, I grow different ones each year, some make it into the kitchen a second time some don't, squash are a bit like sweetcorn, some are very sweet some are not, some folks find the very sweet ones a bit OTT, but others would say the rest are starchy and bland.I love 'em all in one way ot another.Hope this helps.By the way you can grow different ones together , as long as you remain aware of the families they fall into, and like families they are different but loved by somebody.XX Jeannine