If you preserve a flower using glycerin, it will retain its shape and color for six to 12 months, though the color will darken slightly. How long do pressed flowers last in a frame? If the flowers have been properly dried and pressed, they can easily last upwards of ten years - even...
Using a solvent like alcohol, vinegar, or glycerin, you can extract a greater spectrum of the whole plant and preserve the medicine much longer than an infusion or a decoction. Alcohol is especially an excellent solvent that extracts a wide range of plant properties and allows for easy ab...