No green thumb required: Growing a cat-friendly plant is a snap. Here’s what you should look for.

Everyone knows that cats are carnivores. So why does your cat keep snacking on the houseplants? Some experts say greens help cats get rid of hairballs, others that cats crave the fiber and moisture. There may be a nutritional component as well: when feeding on prey, a cat will eat the intestines first, where it’s likely to find plant matter.

But regardless of the reason for the craving, plants can prove a serious danger to cats. Many common houseplants, such as lilies, asparagus ferns, and foxglove, are poisonous. Outdoors, a cat may eat grass or other plants contaminated by pesticides and fertilizer. …

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