Useful Ground Cover Plants – The best ground cover plants are evergreen. St. John’s wort (Hypericum) can be grown in a shady part of the garden where its bright yellow flowers will grow out of the darkness. Rose of Sharon (Hypericum calycinum) flowers from early summer to early fall. It makes a good specimen plant in non-shady places, too, but if planted in a border it can be invasive.
The periwinkles (Vinca) are excellent at covering the ground but can be invasive too, so plant them in woodland where they will have to struggle a little. Vinca minor grows to only just off the ground. It normally has pale lilac flowers but white and dusky red forms are attractive and slightly less invasive.