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Here are some great tips to make your roses stand longer. This link to the video tells you how step by step. I never tried it but I really want to. The picture came from http://floweramacoloradosprings.com/resource/products/product.asp?Cat=3&ProductID=3172
and video from youtube, link below.
Source link: https://www.youtube.com/watch?v=pA9GlxZ4kOA