I know that something like your getting into this business is actually newsworthy. It's a good "human interest" story that can be appealing to a reporter ... and a news story means free advertising.

Alas, I don't know HOW to get into a news story or on the radio, but I bet some folks here can help!

You might also see if some of your local florists and garden shops would allow you to leave a "discount coupon" for your services at their shops. A "coupon" can also work as a type of flyer, but since it's small, you can print up a bunch of them for a few bucks and restock as needed.