This appeared in the garden a year or so ago and I haven't figured out what it is. Google thinks it is juncus or soft rush. As far as I know it didn't flower last year and my garden is not particularly waterlogged, which I thought was necessary for rushes.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.