There are several hardy geraniums that are well-suited for use as groundcover and weed suppression. Some of the best options include:
Also known as big root geranium, it is a low growing, spreading plant that can reach up to 30cm (12 inches) tall. It produces clusters of pink or white flowers in the summer and has large, fragrant leaves. At maturity Geranium macrorrhizum can spread up to 1m providing excellent ground cover and making it hard for weeds to go.
This is a low growing, spreading plant that can reach up to 30cm (12 inches) tall. It produces clusters of pink or purple flowers and has glossy, evergreen leaves.
The sanguineum species are also known as bloody cranesbill, they are a low growing, spreading plant species that can reach up to 30cm (12 inches) tall. There are many different G. sanguineum cultivars with flower colours ranging from purple, magenta, pale pink and white. The foliage is small, palmate and deeply lobed.
Geranium x cantabrigiense ‘Biokovo’:
The cantabrigiense species are low growing, spreading plants that can reach up to 20cm (8 inches) tall. It produces clusters of pink, white or purple flowers and has deeply lobed leaves. G. x cantabrigiense cultivars can reach a spread of approximately 40cm. Several planted together will create a good dense mat, suppressing weeds and creating ground cover.
Is also known as dusky crane’s bill, the foliage creates dense clumps that can reach up to 60cm (23 inches) tall and approximately 50cm in spread. It produces clusters of dark purple or blackish-purple flowers on tall spikes held above the neat mounds of lobed foliage. There are many different G. phaeum cultivars with allsorts of flowers colours ranging from white, to pinks, purples, reds, blues and almost black.
All these hardy geraniums are easy to grow, hardy, and can be used as groundcover in gardens. They prefer well-drained soil, and partial shade to full sun. They are also drought-tolerant once established. They are also tolerant of various soil types.
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