So many of us battle with our feline friends over the houseplants we'd rather they not eat. Ever wonder what plants you can grow specifically for cats? There are the obvious ones that I'm sure we can all name, but there are some less known plants that will make your kitty very happy.
1. Cat Grass (dactylis glomerata)- this is an obvious one, but why spend $4 - $6 a pop at the store when you can grow it yourself? Great not only for cats to help with digestions, but for dogs, guinea pigs and bunnies, too. You can buy seeds at Sprout People.
2. Lemongrass (cymbopagon) - Kitties love the smell of lemongrass, so if you're growing some for yourself, grow some extra for them to gnaw on.
3. Catnip (nepeta cataria) - As seen in the photo below, some kitties will go absolutely crazy for this stuff. Caution: it will also attract neighborhood cats. So if you don't want it all steamrolled by chemically altered felines, you might want to grow some of it in a hanging basket. I learned this the hard way when I found all the catnip in my garden completely flattened. At least some kitties had a good time!
4. Catmint (nepeta x faassenii) - Gorgeous plant with purple blooms, attracts not only cats, but butterflies and bees, as well!
5. Mint family - Cats can be attracted to mint, while mice are deterred by peppermint. So, if you want to make your furry friends happy and lessen your chance of having a mousy gift left on your front doorstep, peppermint might be just the ticket.
6. Valerian (valeriana officinalis, valerianaceae) - Has a similar effect as catnip and is a mild stimulant. Commonly has white or pink flowers.

(Images: WikiHow)

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There are a lot of neighborhood cats in my garden. I would also like to know what plants cats don't like, hehe.
@mnl: Citrus! My cats hate it.
Marigolds! My cats actually took up the task of ripping all of mine out a few seasons ago...
Catmint is a big hit at our house. I'm always jealous of the huge catmint plants my mom has, mine barely grow before the cats roll and roll on them and rip leaves off. But, whatever, it makes the little buggers happy...
Be careful! Valeriana is like drog for cats and they can get intoxicated easyly. The pulse goes down and the cat is not save.
My cat loves potted arugula.
catmint can get HUGE- I bought a few plants a couple years ago, ended up splitting them for a minimum of two other houses before I moved away. just a warning. they are very pretty though and keep blooming as long as you water them appropriately.
I worked at a zoo when I was a vet tech (nonreleaseable wildlife from local rehabbers only, and huge enclosures) and for enrichment we'd give spearmint leaves to the wild cats.