Hi,the term Winter Melon is confusing as there are two things that fall into this category.
1. Regular melons of the casaba family ,grown as usual but have an excellent keeping quality, so they are called winter melons because with a bit of luck you can store them for 10 weeks or so. Santa Claus is one, it is however a fruit as any other melon and should be grown as such.
2. Chinese winter melons, often sold by the slice are actually squash, the name is Tong Qwa, which is Chinese for winter melon. They are usually white or pale cream,some are oblong and some round,taste is a bit like courgette. Often made into a soup.
There are sevaral varieties ,I only know of 8 named ones. They need a very long growing season. I have grown them In British Columbia but not here in the UK. Grow as any winter squash but bear in mind they do need a long season and warm weather to mature.
XX Jeannine