I had lots of plants like this come up in my vege patch this year. In the winter I put my old compost over the soil and it had alot of melon seeds in it that obviously did not compost and sprang back to life. I have one large one growing as I left it where it was to and now have about 6 fruits coming already. No idea what sort of melon as I buy lots of different ones during the summer. Letting it grow on for fun really as you never know if we have more good weather then I could have some melons for free by end of August!