By preserving autumn leaves with glycerin, an organic emollient, you can create a wreath that will last for months without drying out. This method will also work with green spring and summer leaves. The process requires some experimentation; some leaves don't take well to the glycerin. But the ones that do will be beautiful and last long enough to make the effort worthwhile. For best results, always cut branches in the cool of the evening, and never use leaves that have been through a frost.
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