Answer: Sun Patiens are annual plants and if you have a large area, you may want to plant perennials rather than annuals (the initial cost is more but you'll get many years of life rather than a single season). If you still want to plant Sun Patiens, each plant will spread about 3'. If you decide to plant perennials, here are some that do well in your gardening region:
Barren Strawberry: An evergreen that produces showy yellow flowers in the spring.
Common Periwinkle: A medium-to-fast-growing vine-like evergreen. Its lilac blue flowers bloom in April.
Goutweed: A deciduous plant easy to grow even in shady areas with poor soil. Goutweed can grow up to 1.5' tall.
Liriope: Known for its bunches of long, graceful, thin leaves and its flowers that range from white to lilac and bloom along a central spike. May be planted in sun or shade.
Pachysandra: A slow-spreading evergreen known for its pink to purple flowers that bloom from March to May.
Polygonum: A vigorous grower that may reach 1' to 2' in height. It has pink flowers in spring and brilliant red leaves in autumn.
Purple Leaf Wintercreeper: A fast-growing, semi-evergreen plant with dense leaves that turn red-purple in autumn.
Best wishes with your landscape.
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