Not so sure you really can grow your own tea plant from tea leaves, but you certainly can use a tea bag as a good seed starter for other plants. (From exPress-o: How to grow your own tea plant from a teabag)
How To Soak Seed Before Planting: Take a small bowl and fill it with water from your tap, as hot as your tap will allow. Once your bowl is filled with hot water, place your seeds inside the bowl. Then allow the seeds to stay in the water as it cools down.
Growing Turmeric + Turmeric Recipes for Healthy Meals