A gardener had a plant in their family garden for many years that spread by rooting and self-seeding. They accidentally killed it during a cleanup and wanted to replace it. The plant came from a root in light sandy coastal soil, had soft hairy narrow silvery grey-green leaves and flower stems 4-6 inches tall with white single 4-petaled flowers (3/4 inch across), blooming freely all summer.
The plant is likely Matthiola (sea stock). The expert attached a photo and suggested searching for seeds online (e.g., B&T World Seeds) rather than plants.
Sea stock
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