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Hibakujumoku

Hibakujumoku (from – "survivor tree", also known as A-bombed tree in English) is a Japanese name for a tree that survived the atomic bombing of Hiroshima in 1945. The heat emitted by the explosion in Hiroshima within the first three seconds at a distance of three kilometres from the hypocenter was about 40 times greater than that from the Sun. The initial radiation level at the hypocenter was approximately 240 Gy. According to Hiroshima and Nagasaki: The Physical, Medical, and Social Effects of the Atomic Bombings, plants suffered damage only in the portions exposed aboveground, while portions underground were not directly damaged. The rate of regeneration differed by species. Active regeneration was shown by broad-leaved trees. Approximately 170 trees that grew in Hiroshima in 2011 had actually been there prior to the bombing. The oleander was designated the official flower of Hiroshima for its remarkable vitality.

Hibakujumoku species are listed in the UNITAR database, shown below (combined with data from Hiroshima and Nagasaki: The Physical, Medical, and Social Effects of the Atomic Bombings).

Common name

Binomial name

Weeping willow

Salix babylonica

Black locust

Robinia pseudoacacia

Chinaberry

Melia azedarach var. japonica

Fig tree

Ficus sp.

Bamboo

Bambuseae tribe

Azalea

Rhododendron genus

Hemp palm

Trachycarpus fortunei

Oleander

Nerium indicum

Japanese spindle

Euonymus japonicus

Kurogane holly

Ilex rotunda

Japanese aralia

Fatsia japonica

Nettle tree

Celtis sinensis var. japonica

Camphor tree

''Cinnamomum camphora

Silverthorn

Elaeagnus pungens

Japanese persimmon

Diospyros kaki

Eucalypt

Eucalyptus melliodora

Giant pussy willow

Salix chaenomeloides

Southern catalpa

Catalpa bignonioides

Sago palm

Cycas revoluta

Tree peony

Paeonia suffruticosa

Shirodamo

Neolitsea sericea

Cherry tree

Prunus × yedoensis

Crape myrtle

Lagerstroemia indica

Ginkgo

Ginkgo biloba

Oriental plane

Platanus orientalis

Chinese parasol tree

Firmiana simplex

Japanese black pine

Pinus thunbergii

Muku tree

Aphananthe aspera

Japanese hackberry

Celtis sinensis var. japonica

Jujube

Ziziphus jujuba

Japanese flowering apricot tree

Prunus mume var. purpurea

Amanatsu

Citrus natsudaidai

Tabunoki

Persea thunbergii

Bohdi tree

Tilia miqueliana

Japanese camellia

Camellia japonica

Japanese quince

Chaenomeles speciosa

Chinese juniper

Juniperus chinensis

Crinum lily

Crinum sp.