Also this is the macro you were looking for
/castsequence [target=apalloo] mark of the wild, thorns ,,,,
/castsequence [target=player] mark of the wild, thorns

The extra ,,, in the first line allow it to drop to the next line. You don't need the cleartarget because you are targeting by name in your macro so it wont change from your current target. If you like to smash your buttons like I do more comma's may be needed.. but if you press it and watch the cooldowns it would only require 2 comma's.
However I prefer the one that was posted by Zal which you are using now with the mod. It's a little more controlled. Smartbuff is also recommended.