From the publisher:
Need some potions or healing kits? Siarl has been selling potions for over a hundred years!
Located near the heart of the city, Siarl’s small shop and carefully guarded garden are easy to find. Siarl provides herbs, potions, and advice to anyone passing through. If the PCs need a simple potion, Siarl is happy to provide. Just don’t ask him how old he is, or try to get into his garden.
In addition to the normal details provided by all City Streets locations, Siarl’s also provides several new potions the GM can adjust to their own game system.