The first step in this quest is to complete the "Dalmasca's Desert Bloom" hunt. When you get your bounty from Dantro speak with him again and he asks you to take the cactus flower to his wife in the South Bank Village. When you give it to her she gives you a Bundle of Needles to reward you. Step outside the village and then go speak to her again. She asks you to find some Semclam Shells from the riverbank. You can progress the quest by only giving her one shell but there are 5 total - 2 inside the village and 3 in the area directly outside the village. Keep in mind that how well you perform the tasks determines what reward you receive. When you have all the shells give them to her.

She then asks you to retrieve some Nebralim vials from the outpost where Dantro is. There are two Small Vials stashed among the supplies at the outpost. Take them back to Dantro's wife. Next she asks for drops of Valeblossom Dew. If you haven't already progressed the story to Giza Plains in the Rains you will have to wait until to continue. When you've progressed that far you must complete the Cactuar Family sidequest to continue.

With that out of the way you can now use the ferry to go to the North Bank village and from there enter the Broken Sands area. If you're not a very high level you must be careful. There are level 25 Worgens and a Wild Saurian roaming the area. Along the cliffs you'll find pink trees that you get Valeblossom Dew from. You can get a drop from each of three trees here. With them in hand return to Dantro's Wife. Now she asks for a Great Serpentskin which you get from completing the "Marauder in the Mines" hunt. Give her the skin once you've got it and she tells you the patient needs to rest for a while.

After move story a bit return to the village. The patient ("Recovering Traveler") is behind the house. When you speak with him and you discover he has a key into another entrance of the Barhiem Passage. He gives you the key as well as a reward based on how much help you gave Dantro's wife. From least to greatest value the rewards are Balance Mote, Magick Gloves, or Golden Amulet.