Korean Sweetheart Tree

Bright Red Fruits of Sweetheart Tree

The late Dr. J. C. Raulston, N.C. State University horticulture professor emeritus, discovered Korean sweetheart tree in 1985 on the Korean Peninsula while participating in a U.S. National Arboretum collection expedition. 

Dr. Raulston brought seeds back to the N.C. State Arboretum for assessment and evaluation. The common name "sweetheart tree" was coined by Tennessee nurseryman Mr. Don Shadow.

The tree prefers a sandy or medium loamy soil and full sun to partial shade. Once established the tree tolerates brief dry periods lasting 4-5 weeks, and is at its best in soils with consistent and even moisture. Provide supplemental irrigation in regions where summers are exceptionally hot and dry.

Opposite pinnately compound leaves measure 6-10 inches long. The fruits are major asset for this small growing tree/large tree. In late summer showy clusters of heart-shaped fruits ripen from green to pink to red. In early to mid-October the fruit capsules split open to reveal a tiny, shiny, black seed.The grayish colored bark has white striations which adds some winter interest.

No serious disease and insect problems trouble this small 25-30 feet tall tree. Availability is primarily from on-line plant nurseries

The Bigleaf Magnolias For Tropical Accent

Bigleaf magnolia at Biltmore Estates

Bigleaf magnolias represent four species: (Magnolia macrophylla), umbrella magnolia (M. tripetala), Fraser magnolia (M. fraseri), and Ashe magnolia (M. ashei). All are medium-size trees with huge leaves and large flowers that appear after the leaves unfurl. Bigleaf magnolia is native to the southeastern United States as far north to Ohio (USDA hardiness zones 5-8). A mature tree attains heights of 30 to 40 feet and develops an irregular pyramidal form. In the northern areas the tree is deciduous and semi-evergreen in the southeastern U.S.

A tree may take 10 or more years before first blooms develop. Goblet-shaped flowers are creamy white, are rose-purple at the petal base, and over 12 inches across. They open in early summer, mostly high inside the tree and mostly hidden within the dense foliage. Up close, flowers are pleasantly fragrant. Fruit is round to cone-shaped, rose-colored, and nearly 3 inches long; they're unique, persistent, and attract numerous bird species. When cones open, each red coated seed is held by a thin silk-like thread.

Leaves are alternate, simple, 12 to 36 inches long, and 7 to 12 inches wide. They’re bright green on the upper surface and silvery gray beneath. Petioles are 2 to 4 inches long. Their yellow fall color rarely stands out. Leaves are intolerant of most urban pollutants.

Their enormous size foliage make them true horticultural oddities. Fall foliage drops, creates lots of leaf litter and decomposes slowly. The leaf debris may cover over or smother some types of ground covers. Weak branches and huge leaves should be sheltered from wind and ice storms.

Select These Ornamental Crabapples

For those gardeners tired of Bradford pear problems, go shopping for ornamental crabapples (Malus spp.). Selected cultivars mature into lovely small spring flowering trees. Most fit under utility lines. Be careful which cultivars you choose.

Worldwide, there are over 400 cultivars of crabapples in nursery commerce. Most are susceptibility to one or more serious foliar diseases that include fire blight, cedar apple rust, apple scab, powdery mildew and frog-eye.  All 19 listed below are rated with above average disease resistance.

Ornamental crabapple fruits add ornamental beauty in fall and winter seasons. Fruit size is small, less than 5/8 inches in diameter. An extra bonus is that small birds are attracted to the fruits from late fall thru winter.  There is no mess on lawns, walkways or cars.

Consult experts at your state's land grant university for an updated listing which may also additional cultivars. Varieties 'Prairifire', 'Sugartyme', Japanese flowering crabapple (M. floribunda) and M. x sargentii are popular at garden centers nationwide.

Here is your shopping list of 18 of the best.

Adams - 20 x 20ft. (magenta flowers & red fruit)                            

Adirondack - 18 x 10 ft. (white flowers & orange-red fruit)

Cardinal® - 16 x 22 ft. (pink-red flowers & red fruit)

Centurion® - 20 x 15 ft. (pink flowers & red fruit)

David - 12 x 12 ft. (white flowers & red fruit)

Donald Wyman - 20 x 20 ft. (white flowers & red fruit)

Doubloons - 18 x 16 ft. (double white flowers & yellow fruit

Firebird® - 8 x 10 ft. (magenta flowers & red fruit)

Japanese flowering crabapple (M. floribunda) - 20 x 20 ft. (light pink flowers & dark red fruit)

Louisa - weeping 10 x 12 ft. (pink flowers & yellow fruit)

Pink Princess™- 8 x 12 ft. (rose pink flowers & red fruit)

Prairifire - 20 x 20 ft. (red-purple flowers & dark red fruit)

Purple Prince® -   20 x 20 ft. (rose red flowers & maroon fruit)

Royal Raindrops® - 20 x 15 ft. (pink red flowers & red fruit)

sargentii - short spreader 8 x 14 ft. (white flowers & red fruit)

sargentii ‘Tina’ - dwarf 5 x 6 ft. (white flowers & red fruit)

Sugartyme® - 18 x 15 ft. (white flowers & red fruit)

White Cascade® - weeping 15 x 15 ft. (white flowers & lime-yellow fruit)

zumi ‘Calocarpa’ -  20 x 24 ft. (white flowers & red fruit)

* Thanks to J. Frank Schmidt & Sons Co., Boring, OR for their cultivar height and width data and foliar disease ratings.