Joylynn Hardesty wrote:I have sassafras, mimosa, and redbud trees, with a spreading ground cover of periwinkle. I have one dwarf, or small bush quince here as well. It is not my intent to have obvious food at the front. A couple of questions...
Do dwarf quince fruit? I am considering propagation, but if no fruiting, it is not worth the time, to me. This was a plant from a friend of a friend... cultivar unknown. I have not seen fruit, and the thing has been a bit mistreated, so I wonder if that is my fault?
Will the periwinkle overwhelm the quince?
This is my type of periwinkle
http://plants.usda.gov/core/profile?symbol=VIMI2
Yes, dwarf quince not only fruit, but they can be very productive. (Not flowering quince, however.) I would look up how to care for them if I were you and start treating your tree with the respect it deserves.

Check this site out for some good instructions...
http://www.gardeningblog.net/how-to-grow/quinces/
Vinca is a prolific ground cover that can handle sun to shade, so it will spread around your trees. However, it doesn't get very tall and I imagine you can keep it in check by cutting it back in a 3 or 4 foot circle immediately surrounding the tree base. Mulch the base or plant a more compatible ground cover there instead.
As for not wanting obvious food plants in the front yard, you have so many ornamental, yet edible choices for that. Crabapples make excellent jams and jellies, yet most people consider them strictly for decoration. Hibiscus leaves and flowers make excellent teas -- as do the genuine tea shrub, Camillia chinensis (Both hibiscus and camillia flowers are about as ornamental as you can get!) Ornamental kale is a good one for fall/winter. Chrysanthemums are completely edible... etc. I advise doing a search on ornamental edibles or edible landscaping for good ideas.