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Green Thoughts: Four bizarre trees

You don’t expect to find trees with bizarre la­bels such as the “pong-pong”, sausage or can­nonball tree, but all these species, alive and well here in Phuket, are so named on account of their strange fruit.

GardeningGreen-Thoughts
By Patrick Campbell

Sunday 5 May 2019, 03:00PM


Of these oddballs, the one you are most likely to encounter is the “pong-pong” or cer­bera odollam. A hardy native of Malaysia, this member of the apocynaceae genus grows to a height of about 10 metres, and is frequently culti­vated in tropical gardens on account of its glossy leaves and continuous display of fragrant clusters of white flowers with yellow centres which open at branch tips. I know several resorts on the island where the “pong-pong” has been planted at the edges of car parks or other open spaces. There are sev­eral, probably self-sown, decorating the Chalong Rd as it begins its serpentine progress upwards towards Kata.

But its real appeal for many gar­deners lies in its large, globose fruit – glossy, green spheres that look most attractive on the tree. If you are con­templating a shady presence, this is definitely one to consider since the dense crown has layered, evergreen foliage. Moreover, it can be propa­gated from seed or cuttings and begins flowering after a couple of years. Just remember that, in common with most members of the family, the fruits and milky sap are both poisonous.

Another species, C. manghas grows in the wild and may be easier to cul­tivate. A smaller tree, it crops up in coastal swamps and thickets behind beaches, though, like the mangrove, it is a much diminished presence.

There it may keep company with the seagrape or coccoloba. Not an Asian native, the seagrape may now be found growing wild along Phuket’s shoreline, or employed as a verdant hedge in resorts or gardens as a salt-resistant ornamental plant. Also drought proof, it is a tree or tall shrub, with stiff, prominently-veined leaves which are bright green in colour. Almost round, they look very attractive. Hence one popular name of platter leaf tree.

The flowers are fragrant and appear in racemes up to eight inches long, but it is the long bunches of small, berry-like fruit – reminiscent of peppers – that sometimes steal the show. Used locally for making jellies, these green to red clusters give the tree its common name of seagrape.

A most desirable plant for windy, saline conditions, it is being used more and more by knowledgeable landscap­ers around the island as well as doing service as a dune stabiliser. Give it full sun and well-drained conditions.

Laguna Golf Phuket

If you think the seagrape and “pong-pong” are odd, how much more bizarre is the sausage tree (kigelia pinnata)? Grown less for its visual appeal than for its novelty value, it is a medium-sized tree from the jungles of West Africa and bears dark red flowers. These, produced in panicles, are waxy, bell-shaped and stick straight out from their stems. Unfortunately they are malodorous and possess a pungent smell.

But again it is the inedible fruit, seedy, mildly poisonous and powerfully purgative, that is the main attraction: in this case, sausage-shaped oddities that may be 50 centimetres long and weigh several kilograms. A rival to other monsters such as durian and jackfruit. I have not seen it growing here, but would be delighted to hear of any sightings…

The cannonball tree is another oddball – if you will pardon the obvi­ous pun. As with kigelia pinnata, you are much more likely to encounter couroupita guianensis in a private park or botanic garden than in your neighbour’s patch. For instance, there is a particularly fine specimen in Six Senses Resort.

Essentially a majestic jungle tree with large elliptical leaves which are shed twice a year, it has arrived here from South America. But what makes it so odd are two peculiarities: one, the deep pink or scarlet, waxy, scented flowers are not borne on branches, but grow directly from the trunk below the crown; two, they are followed by large, globose fruit that look like huge, rusty cannonballs as they dangle on long stems from leafless branches, spectacu­lar objects that can remain on the tree for many months.

Used traditionally both for medici­nal purposes and feed for livestock, the cannonball is not for the table – or for the small garden. But what a sensa­tional addition to your tropical estate.


Patrick has been writing for thirteen years about gardening in Phuket and allied topics. If you have horticultural or environmental concerns, please con­tact him at drpaccampbell@gmail.com. Many of his earlier creative and academic publications can be found at Wordpress: Green Galoshes.

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