FrontierVille's thorny problem [Poll]

If you have been, like me, wondering where the heck all of your thorns went to --- well, problem solved!. After weeks and weeks of finding ne're a thorn on my frontier, I came back after the long weekend to find the biggest thorn patch I've ever seen in FrontierVille (see image above). So for all of you who have had thorns on the brain, maybe they'll make a magical appearance soon. Now the question is whether to harvest em' or keep 'em around for some future mission.