Archive for May, 2008

Nandina Domestica (Heavenly Bamboo)

May 9th, 2008

A bamboo-like shrub with striking foliage

About Nandina Domestica

Nandina domestica, or heavenly bamboo, is completely unrelated to bamboo. Its name comes from its fine, bamboo-like foliage and its cane-like stems. It is an evergreen to deciduous shrub that will grow to 5 feet tall , 3 feet wide, at a moderate rate. Some sources list Nandina domestica as hardy only to zone 7, but it is hardy to zone 6 with some dieback. It will lose its leaves at 10°F, and at -10°F, its stems will die back to the ground. Recovery is quick in the spring.

Nandina domestica (heavenly bamboo) \'Monum\'
Nandina domestica ‘Monum’ / Plum Passion® (Heavenly bamboo). The colorful, finely-textured foliage creates a striking contrast with big-leaved background plants like Musella lasiocarpa.

Many named cultivars of heavenly bamboo exist, each with different variations in color. Many nandinas feature tropical-looking leaf color combinations of brilliant reds, bronzes, and greens, as well as bright red color in the fall. Some cultivars recently offered by Monrovia have notably superior foliage color. They include ‘Monum’ (Plum Passion®), ‘Monfar’ (Sienna Sunrise™), and ‘Firepower’.

Nandina domestica may be grown in partial shade, but the foliage colors will be much more intense if it is grown in sun. It prefers a moist, somewhat rich, acidic soil. Once established, it becomes very adaptable and will tolerate a wide range of conditions. Site the plant to protect it from harsh winds.

Cold Hardy Camellias

May 5th, 2008

About Camelias

Camellias are evergreen shrubs or small trees with attractive glossy foliage. They originate from subtropical regions of China, Japan and neighboring countries. They are known for their dramatic blooms during the off-season – autumn, winter, or early spring, depending on the cultivar and climate.

Typically, camellias have been grown only in the southern United States, but more recently, the development of cold-hardy cultivars has extended their potential growing range considerably.

Hardiness

Several camellia cultivars have been developed that are hardy to zone 6. A select few, such as those developed by Dr. William Ackerman at the National Arboretum, are hardy to -15°F, and may be worth trying in zone 5.

Camellia \'Snow Flurry\'
Camellia ‘Snow Flurry’

The Hardiest Camellias

  • Camellia japonica
    A spring-blooming camellia. Cultivars hardy to zone 6b: “April Series” (‘April Dawn’, ‘April Kiss’, ‘April Blush’, etc.), ‘Betty Sette’, ‘Frost Queen’, ‘Jerry Hill’, ‘Pink Icicle’, ‘Red Aurora’, ‘Red Jade’, ‘Spring’s Promise’, ‘Bernice Boddie’.
  • Camellia oleifera
    Tea-oil camellia, hardy to zone 6. Often used to hybridize with camellias with showier flowers.
  • Camellia oleifera Hybrids
    Ackerman Hybrids
    Developed by Dr. William Ackerman at the U.S. National Arboretum in Washington, D.C. Hardy to zone 6, some selections possibly to zone 5. Named cultivars: ‘Ashton’s Pride’, ‘Frost Prince’, ‘Lushan Snow’, ‘Pink Icicle’, ‘Polar Ice’, ‘Snow Flurry’, “Winter Series” (‘Winter’s Beauty’, ‘Winter’s Charm’, ‘Winter’s Dream’, etc.).
  • Camellia Forest Hybrids
    Developed by Camellia Forest, hardy to zone 6. Named cultivars: ‘Mason Farm’, ‘Survivor’, ‘Twilight Glow’.
  • Camellia sinensis var. sinensis
    A small-leaf tea camellia, hardy to zone 6. Originally grown from seeds collected in Korea where it was growing in the wild; it had probably escaped from cultivation. This variety is vigorous and grows as a shrub, 6 to 8 ft. tall.

Winter Protection

Site camellias to protect from cold, drying winds. Make sure the plant is heavily mulched around the base; small plants can be completely covered with a loose, non-compacting mulch. Application of an antidessicant spray such as Wilt-Pruf® will reduce moisture loss during the winter.

Growing Tips

Camellias prefer light shade when young. Growing in well-drained, organic soils is essential. Camellias prefer slightly acidic soil, but do not amend the soil to be too acidic or overfertilized.

Musa Basjoo (Japanese Fiber Banana)

May 4th, 2008

About Musa Basjoo

Musa basjoo is generally considered the most cold-hardy banana.

While it does grow in Japan, the Japanese fiber banana is native to the Ryukyu Archipelago, which lies between Japan and Taiwan. It is also very common in parts of China.

Its large, tropical foliage and fast growth rate make it ideal for a dramatic feature in the tropicalesque garden. It will eventually form a large, deep green clump, up to at least 18 feet tall.

Hardiness

Musa basjoo is somewhat unique in that it will actively grow in cool weather. The banana will continue growing until temperatures reach approximately 40° F. It will resist light frost, but die back at 28° F. It is is considered root-hardy to zone 6, and will survive a zone 5 winter with heavy mulch.

Winter Protection

Cut back leaves after soon after light frost damage occurs. Spray the root crown with a fungicide to prevent fungal rot during the winter. Use heavy mulch around the root crown to protect from freezing. Gradually remove the mulch in late winter-early spring as the risk of a hard freeze passes.

Growing Tips

Grow in full sun to partial shade. Musa basjoo thrives on plenty of fertilizer and water during the growing season. It will do well with a regular application of balanced liquid fertilizer applied weekly during the summer. While it is a heavy feeder, be careful not to burn the plant with too high a concentration of fertilizer. Top-dressing with composted manure is another popular feeding method. Leaves may be shredded or dried out in a windy location; pick a site with some wind protection.