I was just given an unexpectedly large two bunches of fresh lavender. I made a little simple syrup with some and made lavender lemonade (and spiked some--- very good!), but here are my questions: 1) I want to preserve it in simple syrup and in vodka. Should I use the whole lavender, or just the purple parts, do you think? 2) think I should freeze the syrup, or will it likely keep a long time? Thanks! Don't want to waste it!