User blog comment:Milesprower2/PopCap, you've gone TOO BUCKING FAR/@comment-28200709-20141114120226/@comment-5792287-20141114122326

Infi-nut's forcefield can block Surfers and Fishermen, but is useless against Octos and you generally only get one or two Plant Food per level, with a few exceptions, so I try not to waste it when I'll usually need to use it on a Winter Melon to severely damage a massive Low Tide ambush.

Oh, plus Surfers can still kill a PF'd Infi-nut and therefore destroy the forcefield. Oh, and without the forcefield, Infi-nut is next to useless in Big Wave Beach because the zombies can kill it if it's on a Lily Pad by simply eating the Lily Pad once they're done with the nut.