Posted: 17/02/2015 at 17:33
Hardy geraniums are about the best for weed suppressing. For me many are evergreen but I guess most are not. However, they are evergreen for most of the year
i have Rozanne that covers 2 or 3 metres ...just one plant.
Ajuga is vigorous...there are different varieties with differing "aggressions". And you can root pieces very quickly to build up a large framework. campanulas like Birch Hybrid spread very well and again resist weeds. What about acorus Ogon? A vigorous yellow grass like plant that covers/smothers ground well. osteospermum, Erigeron are often evergreen here as are varieties of Arabis. Another I grow, but is a little tender,,is convolvulus maritima. Velvety purple blue flowers all summer on semi evergreen wee smothering foliage.