Green stevia powder is easy to make yourself, with no special equipment required. It is simply the dried leaves of the stevia plant, crushed finely into powder. Three to four teaspoons of dried green stevia powder replaces one cup of white sugar in sweetness. Use either dried, purchased stevia leaves, or grow your own plants. Stevia is easy to grow in the home garden.
Snip the leafy stems of stevia plants, leaving at least 6 inches at the base to regrow. In "Growing and Using Stevia," Jeffrey Goettemoeller and Karen Lucke suggest harvesting stevia just before the plant blooms to obtain the sweetest flavor.
Tie bundles of the cut leafy stems with rubber bands or string, and hang them upside down out of direct sunlight to dry. Good air circulation is important for quick drying. The leaves should be dry within a week.
Alternative method: Place the leafy stems on a rack in an electric food dehydrator. Run the dehydrator on a low setting of 110 degrees Fahrenheit. Turn off the dehydrator as soon as the leaves become crispy dry.
Hold the stems, and strip the dried leaves off by hand. Discard the stems. An alternative method is buy dried stevia leaves if you want to take the easier route.
Place dried stevia leaves in a blender, about one cup at a time. Blend on high for 30 seconds. Wait for the dust to settle inside the blender, open the lid, and gently stir the stevia with a rubber scraper. Replace the lid and blend on high for another 30 seconds.
Alternative method: Place about one cup of dried stevia leaves in a flour sifter. Work the handle to break up the dried leaves into tiny pieces. Discard any stem pieces or leaf veins that may remain in the sifter.
Alternatively, you might grind leaves, a few at a time, with a mortar and pestle. Sift to remove leaf veins and stem particles that may remain.
Store green stevia powder in an airtight jar or zipper bag in a dark cupboard or pantry. It retains its sweetness for at least two years in storage.