Glycerin, according to Roxanne's Dried Flowers, is one of the most popular ways to preserve flowers. However, the process is intricate and time-consuming, making it a hard process to duplicate at home.

The process is simple, in theory. As Mary-Anne Da'Marzo, founder of London's The Last Bunch, told The List exclusively, all you need to do is place freshly-cut flowers in a mixture of "one part glycerin and two parts warm water." Da'Marzo says to leave your flowers in the mixture for two weeks before you start checking on them. When they're ready to be taken out of the glycerin, she says the flowers will "feel rubbery." Processing time, according to Hello Lidy, will change depending on the flower; flowers with thinner petals, like alstroemerias, will take less time than those with thicker, like roses.

While this sounds easy enough, Roxanne's Dried Flowers warns that only flowers harvested at the right time will work the best in glycerine. You'll want to use fully mature flowers; new growths will reject the glycerin, which is why you should wait until flowers have fully matured, which is about mid-season.

Plus, DIY glycerine projects won't preserve colors the way they do when professionals do it. While "Hello Lidy" says flowers like Gerbera Daisies, Bells of Ireland, Magnolias, Tulips, and Ranunculus work great for preservation, you will lose coloration during the drying process. Often, food color is added to glycerine solutions to help preserve petal or stem color.