Chances are, as Spring turns to Summer, I may forget to water these awesome herbs. So I thought a watering bulb would be a good idea. You fill it with water, turn it upside down and it provides your potted plants a continuous amount of water. The set it and forget it of plant care.
While I appreciate the ingenuity of this product, I don't spend money on things like that. I will, however, steal their general idea. I used something we happened to have around the house: a beer bottle. I filled the beer bottle up with water, and sunk the neck into the dirt of the Stevia's pot.
If you have bigger pots, a wine bottle would also work for this. I'm sure you could set these up in the garden, but that seems like a lot of work and maintenance and not really worth it.