Opinions vary as to whether or not you should give your cat catnip. However, if you don’t have a problem with it, and your cat likes it, you can easily grow your own to use in toys.
After the danger of frost has passed in the spring, sow catnip seeds in a sunny area of your yard. Once the plants have produced flowers, remove the flowers and leaves and lay flat on a newspaper indoors where they can dry. Make sure to put them in an area where your cat won’t be able to reach. After they have dried, store them in a sealed container.
You can use old socks or mittens to make toys. Child or baby sizes work best, but if you don’t have any, you can always pick some up at a yard sale or thrift shop. Just add some catnip and sew the opening tightly closed.
Your cat will probably also enjoy the plants in your yard, so you may have to protect them in order to keep them from being ruined. However, it is a perennial and will return the following year.