Join Date: Mar 2010
Location: Ontario, Canada
Gardening is one of my passions! In addition to being non-toxic to cats, you also have to consider other aspects before deciding what to plant. In particular, does the area you will be planting get a lot of sun or is it in the shade most of the day. In addition, are you looking for annuals or perennials. As you might already know, annuals only last for one season and need to be re-planted each year. They're also much smaller, although they bloom for the entire summer. Perennials are planted once and then return each year, although they have much shorter bloom seasons than annuals. They also tend to be larger.
Although you like yellow, you might want to consider adding other colors to the mix, since an "all-yellow" garden would be a bit boring (so, mix in some white or purple, etc.). Annuals tend to come in virtually any color, whereas perennials are available in only a few colors. Here are a few initial suggestions you might consider, depending on whether you're looking for sun/shade and annuals/perennials. You can get images of each plant on google:
Annuals for sunny areas: Snapdragon, Zinnia, Petunia (each have numerous colors, including yellow).
Perennials for sunny areas: Coneflower (yellow or purple), Roses (numerous colors), Phlox (purple, pink, white), Catmint/Catnip (purple, white)
Annuals for shady areas: Begonia, Coleus (numerous colors for each)
Perennials for shady areas: Yellow Corydalis, Astilbe (pink, purple, red, white)
All of the above are safe for cats...not sure about dogs, so you should check that out (although usually if a plant is safe for cats, it's also safe for dogs).
Vivid Dawn: Columbines are safe for cats. They require partial sun.