Myoporum laetum (The Ngaio, Mousehole Tree)


Michael's Opinion

Myoporum laetum is an attractive ornamental tree however, it has a few downfalls. The leaves are poisonous and it is considered invasive in parts of the United States because of its ability to spread and grow faster than many native plants.

Botanical Information

FamilyScrophulariaceae
GenusMyoporum
Specieslaetum
CategoryWoody
TypeTree (evergreen), Shrub (evergreen)
OriginNew Zealand.
Pronunciation

Details

USDA Hardiness Zone9
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cool season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH3 - H4
RHS Hardiness Ref.
Temperature (°C)-7 -(-1)
Temperature (°F)20 - 30
Height6 - 10 m
Spread2 - 4 m
GrowthMedium
Flowering PeriodJanuary, November, December

Description and Growing Information

General DescriptionOrnamental evergreen shrub or small tree with leaves capable of poisoning small animals. Suited for growing in coastal regions. It is considered invasive.
ID CharacteristicA deciduous shrub with reddish or purple narrow drupes, has green lanceolate leaves all year that contain small white or yellow oil glands. When in bloom, the white flowers have small purple specks.
LandscapeOrnamental plant can be used as a shrub or a small tree in the garden. It is very salt tolerant.
PropagationPlant seeds during the spring in a greenhouse. Scarification of the seeds will reduce the germination time. Once large enough to handle, separate into individual pots. In the following spring, after the last frost, plant in a more permanent position. For cuttings, take a 5-10 cm length with a heel during July or August. Pot in autumn and provide protection for the first winter.
CultivationRequires full sun and a soil pH of 6-8. Prefers warm temperature and is frost sensitive. Is very salt and drought tolerant.
PestsSooty molds may be present in dense foliage. Thrips are a common problem.
HabitatCoastal regions and lowland forests of New Zealand.
Bark/Stem DescriptionThe bark is light brown or grey and rough to the touch.
Flower/Leaf Bud DescriptionNew buds are 5 cm in size, dark brown or purple in colour.
Leaf DescriptionGreen lanceolate leaves are 5-10 cm in length with small yellow or white oil glands.
Flower DescriptionFlowers are small, white with tiny purple specks and grow in 2-6 axillary cymes. It has 5 petals with 4 stomata.
Fruit DescriptionGrows reddish-purple drupes in clusters each up to 9 mm wide in the early summer, they are edible.
Colour DescriptionThe bark is grey or light brown. The leaves are green with small yellow or white oil glands. The flowers are white with small purple specks. It bears red or purple drupes.
Texture DescriptionThe bark is rough while the leaves are fleshy and oily.

Photographs