Harvest your stevia plant by cutting off the branches at the base of the plant.
Wash the branches/leaves in clean filter water.
Pick leaves off stevia plant, discard the stems, and dry the leaves for 12 hours in the sun.
Once your leaves are dry, grind them in a food processor or coffee grinder to make pure stevia. I find that a coffee grinder makes for the finest powder and works very nicely.
Note ~ homegrown stevia powder is not as sweet as store bought stevia (300 times sweeter than sugar). To cook with home grown stevia simply replace every 1 cup of sugar with 3-4 teaspoons of homegrown stevia.
To make liquid stevia, dissolve 1/4 cup pure homegrown stevia powder with 1 cup hot filtered water. Stir and leave out at room temperature for 24 hours. After 24 hours strain the stevia out of the liquid and store the liquid stevia in the refrigerator.