This article says it does. http://homeguides.sfgate.com/dianthus-spreading-plant-68854.html When I've grown them they form cushions over a foot wide, red thyme is 12" to 18" wide. You plant both 8" - 12" apart, so you would need the same number of plants for both.
Dordogne and Norfolk. Clay in Dordogne, sandy in Norfolk.
My Dianthus 'Flashing Light' is brilliant red and self seeds happily, as well as spreading into quite a wide mat. It is growing in a sunny, well-drained bed, which is naturally fairly shaly. 'Arctic Fire' is another variety of the same species so probably behaves in a similar way.
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This article says it does. http://homeguides.sfgate.com/dianthus-spreading-plant-68854.html When I've grown them they form cushions over a foot wide, red thyme is 12" to 18" wide. You plant both 8" - 12" apart, so you would need the same number of plants for both.
My Dianthus 'Flashing Light' is brilliant red and self seeds happily, as well as spreading into quite a wide mat. It is growing in a sunny, well-drained bed, which is naturally fairly shaly. 'Arctic Fire' is another variety of the same species so probably behaves in a similar way.