The Durable Seeds quest, Mount Hyjal. Kalimdor

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The Durable Seeds quest in Mount Hyjal is pretty straightforward. You run over to The Flamewake and look for piles of dirt, which will be a different color from the rest of the ground. They will also sparkle a little.

The Flamewake is in the red circle. This is where you'll
find the seedlings.

  

This is what the piles of dirt look like, and
what comes up when you put your cursor
over them.

Loot the piles and you will be able to take
the seedlings. You need 10.

When you have 10 seedlings, return to the quest giver. Easy one! :)
Info is good for MoP, I don't guarantee it will be the same after more expansions! If you'd like to add anything feel free to comment!