I am making mum pomanders to be my centerpieces and sit in a vase. I practiced making pomanders with silk flowers (because its winter and I cant get real ones) and they seemed easy enough. My concern is the length of time they will last and still look nice. Has anyone made these that could give me any tips? Also, I have read some articles on making them with mums and a lot of them suggest that you use pins to secure them. Will this damage the flower and make it not last as long? Also, any tips on storing them would be great too. Right now I am planning on making them about 2 days before...