You will be us ing the ingredients you gather from this quest in the next quest.
Also, consider bringing at least 5 Smoldering candles with you when you work on this quest so you can do the next step of this questline immediately after turning this one in.
It is not necessary to speak to Wyneta, James and Neela for quest updates. Just gather the required ingredients.
It is not necessary to harvest these in order, as Zek, Greater Faydark and Kylong Plains all have either Druid Rings and/or Wizard Spires, you'll be close to a portal that will quickly get you back to the Moors.