Nut Signal is a super-rare plant superpower trick card in Plants vs. Zombies Heroes and a member of the Guardian class. It costs 1 to play, and its ability makes a Wall-Nut on a selected lane and draws a card.
Call on Wall-Nut any time. His schedule is wide open.
For more strategies, see Wall-Nut.
This trick is basically like playing a Wall-Nut, with the additional benefit of gaining a card. Use this trick as you would use Wall-Nut, or when you are low on cards. Like a lot of superpowers, it can be a last-ditch effort for survival.
Since this trick makes a Wall-Nut in a selected lane, it can activate Muscle Sprout and Astro-Shroom's abilities. However, Citron and Wall-Knight do not have access to them, meaning they have to get them from Photosynthesizer, Cornucopia and Lily Pad first. Another way through Grass Knuckles and Spudow is to get Nut Signal from Bird of Paradise first, which they obtained from Primal Wall-Nut, Seedling, Reincarnation, Petal-Morphosis, Molekale and Transfiguration
Since this trick is basically playing a Wall-Nut but with the extra benefit of drawing a card, any strategies that apply against Wall-Nut normally also apply to this.