This article is about a recently released or soft-released part of a Plants vs. Zombies game. As such, spoilers may be revealed. Read at your own risk!
They can be tough nuts to crack.
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Spark is a crafting currency in Plants vs. Zombies Heroes, introduced at the 1.4.14 update. Sparks can be obtained by recycling premium cards that the player owns, and is used to craft new ones the player chooses.
To craft a card, the player only needs to access its statistics page in the Collection, and once selected, two choices will appear, craft and recycle. Any of these two options can be reversed until the player leaves the Collection.