What really caught our attention is that our friend said she currently had herbs in her fridge that were at least a month old and still seemed as fresh as the day she bought them. That's longer than we've been able to keep cut herbs using our preferred method of putting them in a glass of water and keeping them in the fridge.
Most versions of this device seem to operate on the same principle: tall canisters for storing the herbs with a well in the bottom for fresh water. The product descriptions don't mention any ventilation or other special herb-saving technology, but you can make out air vents in the pictures of some of the products.
We're still pretty skeptical. The biggest advantage that we can see for buying one of these is that it keeps the herbs neat and contained, and there's not as much risk of spilling herb water all over your fridge (been there, done that!). We wonder if we could make a similar, if less classy-looking, device by poking a few holes in an empty 16-ounce yogurt container.
Here are a few brands to check out. Our friend was using the Prepara Herb Saver:
What do you think?