Almost all editors add a tagline after your article. This typically includes a brief bio. So even if your book is on iguanas and your article features flower arranging, you can include a tagline at the end of your article that mentions your book. Your Great Ideas Article ideas related to your book will come easy at first. Brainstorm with friends, family and colleagues.
More heads generate more ideas.
Do something newsworthy and then write about it. Start a gardening club, head up a community garden for the homeless, appear on a television garden show or teach classes on some aspect of gardening. Study a variety of magazines from cover to cover. Look at the articles, ads and even the letters to the editor. Not only will you better understand the article requirements of that particular magazine, you'll find more article ideas.