Shoulder Shrug Muscles. The shoulder shrug is a simple exercise to perform, and as the name suggests, it does work your shoulder muscles -- namely, the trapezius, or upper shoulder. Additionally, the shoulder shrug works muscles of your back -- the levator scapulae and erector spinae.
Oxalis makes a perennial ground cover in shady areas. Oxalis (Oxalis spp.), also called sorrel or shamrock, has a negative image if all you know of them are weedy, invasive cosmopolitan species. However, most of the about 800 species of oxalis are native plants in tropical South America and Africa or in temperate areas of the Old and New World. Many are used for landscaping or as houseplants. Oxalis are perennial plants but can give the appearance of annuals by going dormant in winter or during droughts.
Common annuals are marigold, vinca, begonia, coleus, zinnia, impatiens, petunia, nasturtium and pentas. But climate plays a big role in determing an annual plant's lifecycle â some varieties of daisies, geranium, lantana, mandevilla, pansies and verbena are perennials in warm climates.nnuals. As their name implies, annuals are plants that complete their life cycle in only one season. Typically used to add seasonal color to flowerbeds and planters, these prolific bloomers die back after flowering. Removing spent blooms will stimulate annuals to produce more showy flowers.