• Summer-flowering shrubs like holly help feed local wildlife.Jupiterimages/Photos.com/Getty Images
  
  Native plants do more than add to the beauty of your landscaping. Having co-evolved with other native species, they provide food sources and shelter for birds and wildlife. Because they have adapted over time to the conditions and diseases common in your area, they require less attention and work. Pennsylvania residents who want a flowering shrub to brighten a sunny spot in the yard have several options, according to the Native Plant Information Network.
  
  

American Holly

• The American holly (Ilex opaca) typically grows as a small evergreen tree, but the University of Connecticut horticulture department recommends the Clarendon and Maryland Dwarf cultivars for homeowners who want a shrub-sized holly. The holly's small white flowers make their appearance in June. If you have a female shrub with a male holly nearby, they eventually will produce the bright red winter berries for which the holly is known. The American holly does best in full sun or light shade and prefers an acidic, well-drained soil and a site protected from wind damage.
  
  

Swamp Rose

• As the name suggests, the swamp rose (Rosa palustris) tends to grow in swamps, making it an ideal ornamental for low-lying, wet areas of your yard, according to the Illinois State Museum. A cultivar bred for ornamental use in the garden also exists, offering an additional option for gardeners who may not have conditions that replicate the swamp rose's natural environment. As a flowering shrub, the swamp rose does not disappoint, producing showy pink and heavily fragrant blossoms during June and July. The fruits produced by the swamp rose serve as food for wild birds.
  
  

Lowbush Blueberry

• If you want a shrub that also produces edible fruit, you may want to consider the lowbush blueberry (Vaccinium angustifolium), a Pennsylvania native whose early-summer blooms develop into sweet, tasty berries. The University of Connecticut describes its white blossoms and reddish-brown autumn foliage as showy. Both develop in a greater multitude when the lowbush blueberry grows in full sun. In addition to abundant light, the shrub prefers a sandy, acidic and well-drained soil and benefits from mulching around its root system.
  
  

Swamp Mallow

• The pink or white blossoms the swamp mallow (Hibiscus moscheutos) can measure 6 inches across, making it a full-sun shrub that commands attention in your garden. Blossoms persist through the summer, according to Floridata. Although the swamp mallow dies back each winter, it returns in the spring and reaches 7 feet by the season's end. The swamp mallow prefers a moist soil -- as its name suggests, it originated in the swamp -- with lots of nutrients, meaning that this one may require extra attention from you in the form of water and fertilizer.