I am very lucky with my sitaw this year. I already freeze a lot of it already. You can see my process under "Too Much" post In My Kitchen. Right now the greens ones are changing color because we are having some cold nights.
This is my purple sitaw and actually behind it you can see an Albino sitaw. Makes me wonder why they are white well actually its very light yellow green in color. I already have some seed for next year. A lot more than I had this year, and I will be putting patches of vegetable garden along my property too next year.