Radermachera sinica tree – Cây hạnh phúc (happy tree)
Culture
Winter hardy, where it is best grown in rich, evenly moist, well-drained soils in full sun to part shade. Site in locations protected from strong winds. Intolerant of frost. In temperate climates, plants may be grown in containers as houseplants. Best with a soil based potting mix. Indoor plants prefer bright indirect light (avoid direct full sun) including several hours per day of curtain-filtered sun from east, west or southern windows. Keep container soils consistently moist but not wet. Soils should not be allowed to dry out. Indoor plants perform best with 70-75 degrees F. temperatures during the day and 60-65 degrees F. temperatures at night. This plant tolerates the dry indoor conditions found in many homes, but appreciates regular misting of the foliage. Container plants may be placed on patios or porches in protected positions in semi-shade during summer, but must be brought indoors prior to first fall frost date. Prune as needed to prevent legginess. Propagate by stem cuttings in summer.
Noteworthy Characteristics
Radermachera sinica, Happy tree, serpent tree or emerald tree, is a broad-leaved evergreen tree that is native to subtropical mountain areas of Viet Nam In its native habitat in optimum growing conditions, this tree will grow to as much as 90′ tall featuring bipinnate compound leaves (to 30″ long) with glossy dark green leaflets (to 2″ long) and fragrant, trumpet-shaped, crinkly-petaled, white or yellow flowers (each to 3″ long) which bloom in panicles at the leaf axils or branch ends in spring and summer. Flowers are followed by non-showy fruits in slender capsules. In cultivation in frost free climates, this tree usually grows to a much smaller 25-30′ tall. In more temperate climates, Happy treel has become a very popular foliage houseplant (it rarely produces flowers indoors) which often tops out at 4-6′ tall.
Synonymous with and formerly known as Stereospermum sinicum.
Problems
No serious insect or disease problems. Watch for aphids and spider mites on indoor plants.
Uses
Where winter hardy, this tree serves as an interesting specimen/accent or small shade tree in protected areas of the landscape. Where not winter hardy, grow as container plant for patios or porches that must be overwintered indoors.
How to Care for a Radermachera sinica tree
Consider your light sources
Happy tree plants need plenty of bright, but indirect, light. They need at least four to five hours of this kind of light a day. If the windows in your house are unable to provide suitable light, then you may want to use an artificial plant light to add additional light.
Choose the perfect room temperature
They are also fussy about the temperature that they thrive in. These plants prefer to live in temperatures of 65 to 75 degrees F. (18-24 C.). They will not tolerate drafts, so make sure that wherever you put your happy tree, it remains free from drafts and wind.
Water just the right amount
Happy tree plants need moist, but well-drained, soil. Water when the soil on the top of the pot is dry to the touch. Be careful not to overwater the plant, as it does not like this and can develop root rot if left sitting in water due to poor drainage. This plant should not be repotted, as it grows best when its roots are rootbound.
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