Here is the new collection released by farmville under Halloween collection.
Seeds
Candy Corn: harvest in 4 hours cost 20 coins and gives 60 coins when sold. 1st level mastery require 512 crops. Gives one xp and available till 9th November.
Animals
Skeleton horse
Buildings
Haunted Hut.
Decorations
pumpkin fence, pumpkin fountain, scaredycrow, mummy gnome