Trailing Lobularia - good filler of tiny white fragrant flowers that spill over pot edges
Sedum - fall blooming flower in a rusty red tone, easy keeper
Hakone - bright lime toned grass (any grass plants are easy keepers and look lush!)
Lamb's Ears - greyish green foliage with a velvet texture, produces pink flowers late summer
Ferns - thrive in shade and moist soil
Grapevines - large green leaves producing abundant fruit late summer / early fall. Leaves change to vivid tones of yellow and lime early fall, then fall, leaving a delightful branchy effect. Vines can be used to craft wreaths that can be kept forever. Fast growing, easy to train, provides privacy.
How to grow a country garden around your shed:
Add some DIY projects to your shed using reclaimed wood. ie: window boxes, a pallet porch, shutters, barn door etc.
Insert features such as window boxes, stumps, pots, etc.
Cut out flower beds, and fill with fertile soil.
Plant perennials first.
Insert annuals for fill-ins or colour next.
Keep soil moist and well fluffed so water doesn't repel soil.
Feed plants and flowers once a week for thriving results.
Divide current plants often to build your garden up!
Shop for currently blooming perennials to fill in spots that need it.
Deadhead flowers and cut back dead growth regularly to keep flowers and plants thriving!