Old fashioned trailing African daisy was becoming too common by the time it succumbed to the Big Freeze just prior to Christmas of 1990. Shrubbier and more colorful cultivars of hybrids with similar species, particularly Osteospermum ecklonis, are now more popular. Such hybrids mostly lack species designation because their lineage is very complicated.
Mature specimens do not grow much wider than two feet, so do not migrate as efficiently as old fashioned trailing African daisy. Since they are hybrids, they do not produce viable seed either. However, if pressed into damp soil, peripheral stems generate roots to grow as new plants that extend the collective width. They also replace deteriorating old plants.
Sporadic bloom may be almost continuous between a few profuse phases, with the most profuse phase between winter and spring. Only the coolest and warmest weather inhibit bloom. It can be difficult to shear overgrown plants between phases without ruining a few flowers. Floral color is pastel hues of purple, lavender, red, pink, orange, yellow or white.
Tony Tomeo 
We can buy Osteopspermum as a summer annual here, but they are never labelled properly and I have never seen a trailing one. Must be pretty.
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The trailing sorts are neither as colorful nor as prolific with bloom as the fluffier shrubby sorts. My favorite trailing looked nice on the freeways, but was either white or purple and white, with sporadic bloom and foliage that was somewhat sparse. Weeds could grow through it. As much as I would like to add it to my garden, I would be hesitant to recommend it for someone else’s garden.
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