The best way to do this is to store the material in a air tight container out of sunlight. However, whether it be flower, mushroom, leaf etc., it usually has some moisture content and needs to dry out completely before storing or it will mold.
Below I have listed my favorite ways to dry my plants and mushrooms.
#1 - Food Dehydrator - I put buying one of these off for a long time because of the cost - but I am glad I finally got one! They are so predictable and fast. It takes about one day to dry materials which is great for storing your materials fast.
#2. Hang to dry - This is an easy, low cost, and pretty way to display your plants and dry them for future use. I harvest a few items at a time and tie them with twine and hang them upside down.
#3. Dry outside on a screen - it provides good air flow to dry the flowers quickly and dries a large amount all at once.
After drying your dye materials I suggest putting them in an airtight container. The cool jars below we found at an antique store. These materials are now ready for dyeing and look nice hanging out until you do!
Happy Harvesting and Dyeing!