Winter Structures

I love plants that give the garden interesting structure even in the winter time. Like ornamental grasses:

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And sedum:

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And echinacea seed heads (which I will get screamed at by the birds for cutting down well after the green leaves are up).

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Obviously these were taken before our unusually warm, record breaking weather here, it was supposed to get to 67 degrees F today. Strange.

Anyway, back to the plant structures. How about you? Do you leave dead plants standing in your yard for winter interest, and of course, for the birdies?