Azpha is the very first thing you are able to gather with your Extract Vitality Skill. This herb isnt very commonly used in anything important. The best possible place to farm this herb is on the Asmodian starter island of Ishalgen. As far as the best area on this island, you will want to head to Munihele Forest. This is where you will find the most Azpha for you to gather.
NOTE: Farming Azpha is NOT worth it, if you need to raise your skill on the other hand then obviously you have no choice but to collect it.