You'll find more information with with spelling Dymondia margaretae.

"Fast growing, the silver carpet forms a neat, prostrate, fairly drought-resistant ground cover, with blue-grey foliage and small, yellow, daisy-like flowers [in spring]. If not given a well-drained position the plant tends to rot and die back. It could also be used to form a ground cover between paving stones or railway sleepers. Plant the silver carpet in light, sandy, well-drained soil, adding plenty of compost. Do not overwater. Propagation by seed or division of clumps. Natural distribution: it grows in the southern Cape [of South Africa]."

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