Man eating creepers in SONH

[Glosk]

Does anyone know how to make the man eating creepers spawn in swamp of no hope? I spent hours and hours there killing everything i can see but nothing spawns. I've researched Zam and other web site sources but nothing seems to work.

If anyone had luck with spawning the creepers please let me know where and what method. Its for the apprentice skullcap quest in Cabilis.

Thanks!

Glosk <Harbringers of Thule>