It keeps them cosy, moderating the rise and fall of temperatures in the top few inches of the soil. Temperatures fell into the low 20's F last night but these guys look great. From the top they're Arachniodes standishii, Cyrtimium falcatum, Coniogramme emeiensis, and Polystichum polyblepharum.Other evergreen perennials appreciate this kind of airy leaf mulch; Hellebores, Epimediums, Asarums among others. Leaves constantly moving in the wind are trapped under the plants. During my weekly "touch-ups" I will remove excess leaves that may mound or mat against he plants. That's more an aesthetic issue; still important though.
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