They are really attractive when hung in this manner, especially if tied with a bit of raffia or pretty ribbon. But if your not going to use them right away store them in tightly closed jars, preferably colored glass jars to keep out of the sunlight which can be damaging to the herbs potency. To dry seed heads tie the herbs in bundles and then place in a paper sack and hang upside down so that when the seed head is dry all the seeds will fall into the bag. Alot of people ask me if drying herbs in a microwave is a good idea. Well, that is entirely up to you, however, microwaves all have different temperature settings and you may end up with burned herbs instead of just nicely dried ones.
Some people like to freeze some of their herbs.
But do a little research first to decide which herbs are best for this type of method.