Archive for the ‘winter hardiness’ Category

Add Hardy Begonia To Your Shade Garden

Hardy begonia (Begonia grandis) is the only species of begonia which is winter hardy in USDA zones 6-9 (zone 5 with protection). This shade-loving perennial grows 18 -24 inches high and wide, and displays a well-branched mounding habit. Foliage is medium to olive green above and reddish green with red veining beneath. Leaf shape is […]

Northern Maidenhair Fern Appear Delicate But Grow Tough

  Their leaves (called “fronds”) appear delicate, but maidenhair ferns (Adiantum spp.) are reliable long-lived perennials. Northern maidenhair (A. pedatum) thrives in most gardens within USDA zones 3-8, while the Southern counterpart, (A. capillus-veneris), predominates in warmer USDA 7-10. Unfortunately, planting of maidenhairs are not utilized in the Southern Appalachian gardens (USDA zones 6-8). Fronds average 18-24 inches in […]

Growing Mountain Laurels in Your Landscape

Mountain laurel (Kalmia latifolia) is a U.S. native evergreen broadleaf shrub (USDA hardiness zone 5). Mature sizes range from 5 feet (dwarf cultivars) to 12 feet in height and with equal spread. Over the past 30 years, mountain laurels have so improved, thanks to breeding efforts of Dr. Richard Jaynes*. He has released several dozen […]

Evaluating Weeping Bald Cypress Cultivars

Bald cypress (Taxodium distichum) is a large 75 -80 foot deciduous conifer tree. They are long-lived, often 100 years or more. Bald cypress is incredibly hardy from the warm humid Florida swamps to the cold winter temperatures and loamy soils of central Michigan. Bald cypress is tolerant of a wide range of soil and moisture […]

Peruvian Lilies – A Gift Which Keeps On Giving

Peruvian lilies (Alstroemeria spp.), also called Lilies of the Nile), are not true lilies (Lilium spp.). Likely, you have purchased a bouquet of alstroemerias from the florist section of your local supermarket. In addition, many potted hybrid varieties have been introduced from Holland and elsewhere over the past decade. Turns out that some Peruvian lilies are perennials, winter hardy in the Southern Appalachian Region (USDA hardiness zones 6 […]

Complete Care of Tall Bearded Iris

Most gardeners plant tall bearded iris from late August through October to insure good root development before winter sets in. Spring planting is another option as iris may be purchased in containers. Bare root rhizomes need to soak overnight in water before planting. Bearded irises prefer a sunny location and a slightly acidic well-drained soil. […]

Katsura Tree Comes Home To America

Katsura tree (Cercidophyllum japonicum) is a large 50-60 feet tall tree from Japan and China. Katsura became extinct in North America during the Pleistocene Age and was re-introduced in 1862 by botanist Thomas Hogg. It is truly a beautiful tree, yet is still rarely planted. Katsura is hardy in zones 4-8. It prefers a moist well-drained, compost-rich soil […]

Piedmont Azalea

Piedmont Azalea (R. canescens) at Callaway Gardens Early flowering Piedmont azalea (Rhododendron canescens) is one of the most common native deciduous azaleas in the southeastern U.S. It is frequently confused for pinxterbloom azalea (R. periclymenoides) which blooms 3-4 weeks later. Piedmont azalea is hardy in USDA hardiness zones 6 to 9.   Piedmont azalea reaches a mature height between […]

Evergreen Kousa Dogwood? – Depends on Where You Garden

Chinese (kousa) dogwood (Cornus kousa) is a small spring flowering dogwood. Kousa blooms about 2 – 3 weeks after our native flowering dogwood (C. florida) has finished. Lustrous dark green leaves begin to emerge a week or two before the lovely pointed 3- inch white bracted flowers. Fall leaf color is purplish red and not quite as vibrant […]

Evaluating The Weeping Redbuds

  There  are so many fine redbuds (Cercis spp.) which are hardy in the Southern Appalachian region (USDA zones 6 and 7) and elsewhere.  Through research and breeding efforts at the JC Raulston Arboretum in Raleigh, NC, Southeast U.S. gardeners can grow several more cultivars of our native Eastern redbud (C. canadensis and subspecies texensis) and […]