From Guild Wars 2 Wiki
With a later release the toxic seedlings were confined to only appear in the Kessex Hills and were removed from other zones.
- Pristine Toxic Spore Sample (1 or 4-9, world nodes only, 1 node per clusters)
- Pristine Toxic Spore Sample (3-5, event nodes only, gathering bonuses apply to event nodes)
- Mushed Spore Sample (0-1, world nodes only)
- Kessex Hills
This is a partial list. All locations do not contain a spore cluster all of the time.
- Brisban Wildlands
- Sparkfly Fen
- The Mists (event nodes only)