WHAT: Few people would think of hardy geraniums or cranesbills as ground covers, but the Album variety of geranium macrorrhizum creates a tight, dense mat of fragrant, light green foliage that is evergreen to boot.
WHY PLANT IT: Profuse clusters of slightly blushed, white flowers with pink stamens emerge in late spring and early summer. Its weed-blocking foliage works well as filler around other perennials. It does not have an aggressive root system and will not harm delicate and shallow roots of plants such as rhododendrons.
WHERE: This tough ground cover will tolerate most soils as long as it does not become waterlogged. Thickest growth will occur in full sun, but it will grow and flower well in partial shade.
It works well in front of taller perennials such as asters or solidago and is useful as an edging for borders. Its medium-sized round leaves contrast well with the fine foliage and textures of ornamental grasses or woody shrubs such as nandina, hebe and barberry.
HOW: Once established, it requires little maintenance. Light shearing after flowering will encourage some late- season flowers.
Older plants will tolerate some drought but will need occasional water during prolonged dry periods. Dividing this perennial is easy but is best done when dormant from late fall to early spring.
ACTUAL SIZE: It will grow to about 12 inches tall and will spread up to 5 feet wide within five years. Space plants about 24 inches apart to create a carpet within two years.
LEARN MORE: See www.greatplantpicks.org.
Source: Great Plant Picks
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