Monthly Archives: January 2009

Root Awakening (31 Jan 09)

The last Root Awakening column for the month of January was published today. Answers to four gardening questions were given.

The first question was about growing the bougainvillea. From the bougainvillea expert Eric Simon’s talk, we know that we should refrain from growing these flowering shrubs in the ground. It is better to grow them in large pots. Feeding with the right fertiliser for flowering is also essential and to keep the plant well prune to discourage the growth of long, leggy ‘water shoots’. A hot and dry spell tends to trigger the profuse flowering of these plants.

The culinary/cooking ginger we have can be grown from the rhizomes bought from the market. Unlike sprouting potatoes that are poisonous, sprouting ginger rhizomes can still be used for cooking. However, trying to grow the ginger plant in high-rise conditions can be difficult as plants tend to get attacked by various pests and does not like the windy and dry air conditions.

In the high-rise apartment, it is important to take note the amount of water that is to be given to a plant. It is not logical to give a list of fixed rules for all to follow as environmental conditions tend to vary from home to home. For watering, the best guide is to stick one’s finger into the soil to feel for moisture. If it is still moist, hold back watering. Dracaena fragrans, a popular houseplant, can succumb to overly wet conditions where the leafy shoots turn black and rot.

Light is perhaps the most important factor for success of high-rise gardening. Plants need light to make food and grow. Hence, it is important to locate our houseplants just next to the window or in the balcony where they can receive filtered to direct sunshine for 4 to 6 hours daily. Some plants require more light than this and hence these are not suitable for growing in one’s home. The lack of light shows up via the following symptoms – loss of variegation in variegated plants and long, extended and spindly growth. It is normal for plants to reach out to light as light comes in one direction in the home environment. However, it is vital to turn plants around so that their growth form remains symmetrical.

GCS Feature Articles for Jan 09

This month, I have written two gardening feature articles for members of Green Culture Singapore to read and enjoy. The month of January 2009 is the Lunar New Year period and both articles revolved around this joyous, festive theme.

The first article focussed on the popular houseplant, Zamioculcas zamiifolia, that is also commonly called the “ZZ Plant”.  Unlike most other festive plants that produce showy and colourful flowers, Zamioculcas zamiifolia, is grown more for its elegant growth form and shiny foliage. Read the article below to know how it became a Lunar New Year festive plant and how to propagate it.

The second article is a book review on the work by Peter Valder entitled “The Garden Plants of China”. This book was recommended to me by a fellow Green Culture Singapore member some years back because I was looking around for a good book to learn more about the many Lunar New Year plants.

Click on the URLs below to download the pdf file to read the articles.

Zamioculcas zamiifolia: More than just a Lunar New Year festive plant

Zamioculcas zamiifolia, commonly called the “ZZ Plant” is a popular Lunar New Year festive plant that is also grown as an ornamental, mainly for its attractive glossy foliage. It is evergreen in the tropics and constitutes one of the worthy buys in the category of festive decorative plants because it does not die away and had to be discarded like those that originated from temperate or subtropical climates that are imported prior the festive season. Read this article to learn more about this cast iron indoor plant!

URL –
http://www.greenculturesg.com/articles/jan09/jan09_zamioculcas_zamiifolia.pdf

 

Book Review on “The Garden Plants of China”

Want to know more about your Lunar New Year plants? Read the book entitled “The Garden Plants of China” by Peter Valder! It is a colourful and highly informative book that is a must-read for those who want to know more about these festive plants as well as many others that are also grown in Chinese gardens. The information about many of these plants are scanty and scattered and this work is a bold attempt to bring as much as what Valder can gather into one volume. It also enables the interesting knowledge about these plants to be made accessible to non-Chinese readers too.

URL –
http://www.greenculturesg.com/articles/jan09/jan09_garden_plants_of_china.pdf

The rewarding Hoya obscura

Hoya obscura is a hoya that every hoya grower should have in his/her collection. I came across this delightful hoya when I was shopping at World Farm at Bah Soon Pah Road about a month ago. It has kind of become my favourite hoya plant that I have in my collection since I started to focus my attention on this genus of plants belonging to the milkweed family, Asclepiadaceae.

Unlike many other hoya species with boring green leaves, H. obscura joins the ranks of plants in the same genus with differently coloured leaves. It leaves, when exposed to direct sunshine, will turn into an attractive wine-red colour that contrasts starkly with the network of thin, green leaf veins. Hence it is best to grow this hoya plant on a sunny windowsill where it will be able to receive at least 4 to 6 hours of direct sunshine.

My plant is grown in a hanging pot and it is now hanging from my North-facing balcony where it does not receive any direct sunshine. Hence only some of its leaves are red in colour which is still pleasing to the eye although it would redden up more when grown under brighter conditions.

 Another plus point about this plant is its amazing flowering habits. It is one of the most floriferous common hoyas around. Since I bought the plant a month back, it has not stop flowering at all! An astonishing characteristic of this species is that brand new flush of flower buds emerge almost immediate after a earlier umbel of flowers falls off!

Although each individual H. obscura yellow flower is small, it emits an intensely yet pleasantly perfume. The fragrance can be difficult to detect in the day but becomes stronger at night. Fragrance in the garden is an often overlooked aspect of gardens. During the night where light is dim and it gets difficult to appreciate the colours of leaves and flowers, fragrance emitted from flowers will stand out in the pitch black darkness after dusk in the garden. It adds an important dimension to gardens.

This species of hoya seems to be able to tolerate windy conditions encountered on my highrise balcony quite well. To prevent the plant from drying out too quickly due to the frequent high winds, I make it a point to provide it with water once every day, where I water it thoroughly every morning before I leave for work.

Back to my old house at Geylang Bahru…

The first day of the Lunar New Year, to most Chinese, is the day that is reserved for visiting one’s close relatives. For my family, we gathered at our eldest Aunt’s place for a Lunar New Year lunch at Geylang Bahru. My paternal extended family all once lived there and it was the place where I grew up. I attended the kindergarten nearby and had my primary school education there. Now, it is only my Eldest Aunt who is still living there and being able to visit the place where I grew up brought back a lot of fond memories.

I moved out of Geylang Bahru in 1995 and 14 years have elapsed and the place has changed so much. It underwent upgrading and an extensive face-lift that rendered the entire environment that is almost foreign to me now. The playground with a sandpit where I used to play in has disappeared and the area that used to house it has been turned into a miniature park that was lush with greenery. I saw a lot of golden penda (Xanthostemon chrysanthus) and black olive (Terminalia molineti) trees being planted in this park, which were popular landscape trees a few years ago.

I was quite happy to note that during the entire upgrading project, the Kolam Ayer Town Council did not remove some of the trees that were planted in the area. I was happy to see the two yellow flame trees (Peltophorum pterocarpum) that saw me grow up are still growing so healthily between Blocks 55 and 56!

The Yellow Flame trees have grown so tall that their canopies have now overshadowed the windows of the 5th floor unit where I used to live in Block 56! The full length windows that my old apartment used to have allowed much direct sunshine into the grow area where I used to grow edible plants that love the sun so much. I guess that is no longer possible right now since the trees have grown so tall that they block off the much needed sunshine!

The Kallang River located just next to the point apartment blocks had also been transformed into an idyllic riverside park. Both sides of the river have been intensely planted which are totally different from the boring concrete riverbanks seen in the past.

The project that transformed the Kallang River banks is an ABC (Active, Beautiful and Clean) waters programme spearheaded by the Public Utilities Board (PUB). The name given to this new riverside park is the Kolam Ayer ABC Waterfront. The transformation took place in April 2008, which was just barely a year ago!

The Kolam Ayer ABC Waterfront is part of the Park Connectors Network which is under the care of the National Parks Board (NParks). I really enjoyed my time walking along the length of the Kallang River whilst enjoying the trees and lush greenery that was planted along the path. At various intervals, there were extended platforms that allow one to get near the water that was flowing in the river.

Along the path, one can see dense but creative mixed planting which involved numerous specimens of the weeping tea tree (Leptospermum brachyandrum) and black olive (Terminalia molineti) trees together with colonies of lemon grass (Cymbopogon citratus), aromatic pandan (Pandanus amaryllifolius),  Calathea lutea, purple fountain grass (Pennisetum setaceum ‘Rubrum’) and both the green and variegated forms of the Spanish reed (Arundo donax).

The usage of the purple fountain grass and both the green and variegated forms of the Spanish reed was particularly extensive and are planted on two sides of the walking path. Both plants with their grassy foliage tend to give one the impression of walking in the ‘wilderness’.

Near the middle of the park, one can get to see two interesting gadgets that enable one to interact with water. One is the waterwheel which harness the kinetic energy of flowing water to do work. There is a chair that was placed ahead of the wheel where one can exercise his/her legs to drive the peddles to work against the resistance of moving water.

Near the water wheel are three Archimenes screws which can be used to bring water up onto the river bank for irrigation purposes. There is a steering wheel-like device where one can turn to channel water up from the river. As the name of this device suggests, it is the creation of the famous mathematician, Archimenes. One can use it to enlighten our kids about his immense contribution to mankind.

Further down the path, one will encounter a bridge-like structure that is very much like a boardwalk we encounter at Changi beach, albeit on a smaller scale! From one side of the riverbank, two rigid bridges extend outwards into the river and are connected to a  floating deck that will rise and fall according to the tides. Like what its signboard says, it is really an ideal venue for morning exercises and holding functions on a fair and cool day.

As one reaches near the end of the Kolam Ayer ABC Waterfront, he/she will encounter the Kolam Ayer Bridge which one can walk across to enjoy the greenery that is planted on the opposide river bank.

Besides growing plants for greenery and aesthetic purposes, they also offer shelter for the different types of wildlife that live in the riverside environment. Thoughtfully selected plants are grown in some parts via a series of terraces that extend downards the slope of the river bank. As high tide commences, the water level rises, and as it recedes thenafter, some of the waterborne pollutants get filtered away by the soil beds held by the terraces. Cleaner water is then returned back into the river.

Another interesting point to note about the planting is that riparian plants are chosen for planting along the river banks of Kallang River, which is one of the rivers in a network that channels water into the Marina Reservoir. Riparian plants, as mentioned on a signboard, is a group of plants that are able to tolerate periods of flooding that is brought about by the rise and fall of tides.

They are used to prevent erosion of soil from the riverbank, as well as, for the authorities to access the change from of water conditions from one that is brackish to freshwater with the progress of the formation of the Marina Reservoir. The presence of plants along the riverbank also help with the cleansing and filtration of river water that will feed the reservoir. In addition, the use of riparian plants also confer a more naturalistic look to the riverside landscape. One very common plant that was used along the Kolam Ayer ABC Waterfront was the beach morning glory (Ipomoea pes-carprae).

Lunar New Year Plant Newspaper Feature

There was a feature on Lunar New Year plants that was published on Life! on Tuesday. Some of the plants are relatively new in the festive plant market whereas there are others that received a make-over.

The one plant that was made a Lunar New Year plant this year is the netera (Nertera granadensis). The plant is appreciated for its compact, small size and numerous attractive, orange, bead-like fruits it produces. I have seen it being offerred for sale throughout the year but it is not a commonly seen plant in most nurseries, only a selected few import this plant for sale. It is probably the orange fruits that enable it become a Lunar New Year plant because it is an auspicious colour for the Chinese. 

Citrus are indispensable for the Lunar New Year. This year, ‘bonsai-ed’ specimens are available as they look better and impressive than potted shrub-like plants that are normally put on sale. Because of the time required to form the twists and look, these citrus bonsais are not usually not cheap to get. Like what is written in the article, with good care, the plants can continue to grow and bear some fruits, but not as heavily, if they are well taken care of. They need to be given direct sunshine outdoors for best results.

The Buddha’s hand citron (Citrus medica) is a nice but an easy plant to get locally in the Lunar New Year festive plant market. The curious-looking fruits with finger-like projections are largely pulpless but they are especially fragrant and symbolise good luck, abundant wealth and longevity.

Another plant commonly called the Japanese begonia here is not related to the begonia at all. It is a member of the rose family and related more to apples and haws. It is in fact an ornamental quince (Chaenomeles spp.). Its Chinese common name is really called the “hai tang” (海棠, begonia), but it is a name which referred to the plant’s foreign origins and has nothing to do with the begonia plant. A member on the Green Culture Singapore discussion forum said that her plant had survived the heat of Singapore and had put forth a couple of flowers over the whole of last year.

Pitcher plants are not new Lunar New Year plants as they made their big debut about two years back when it was the Year of the Pig in the Chinese zodiac. The Chinese name of the pitcher plant is called the “Pig Cage Plant” and everyone hope to catch the golden lucky boar back then. This year, plants that are offered for sale after getting a elaborate makeover. The usual ones we get here are those that have pitchers hanging over the side of a pot. Bear in the mind that the plant actually requires filtered sunshine for at least 6 hours daily to grow well and not full shade as mentioned in the article! Pitchers should have water in them so that they do not dry up! For prevention of mosquito breeding, one is advised to drop in a few BTi granules instead. Cut away dried up pitchers and discard them accordingly.

The Serangoon Newsletter (Jan 09)

The January ’09 issue of the Serangoon newsletter is out now and those who live in the Serangoon constituency should be receiving a copy in their mailbox soon. In this issue’s gardening feature page, I wrote on heliconias and their decorative use for the Lunar New Year. It was inspired by a post that I posted on this blog almost a year back.

I thought heliconias make good festive plants for the Lunar New Year especially those that produce red-coloured, hanging inflorescences which resemble a string of firecrackers. Firecrackers have long become one of the symbols associated with this important Chinese festival. 

For those of us who live on landed property with some garden space to spare, one can opt to grow a clump of heliconia in the garden to welcome the guests and relatives who pay a visit during the festive season. For those of us who live in apartments, although there is no space at home to plant a clump, one can still grow these plants in a nearby community garden. One can also go to the florist and buy some cut heliconia inflorescence to display in vase! 

Many people shun heliconias because they are thought they grow too big and spread and then run over one’s garden. Not all species and cultivars are gigantic and take over one’s garden. It is recommended for one to do some homework asking fellow gardeners who are familiar with the growing of these magnificient tropical flowering plants. There are very nice heliconias that adopt a more clumping growth habit. Size of each clump depends on the light that is available for growth and plants that are planted under shadier conditions are usually taller in height.

Hope the residents of the Serangoon constituency will enjoy reading this article. However, note that there are two errors. The first one to note is that all botanical names, except the cultivar name, of plants should be italicised. The next one is that the pictures of Heliconia ‘Dinosaur’ and Heliconia vellerigera should be swopped. The captions were wrongly placed. Hope this clarifies and apologies for the mistakes!

Lunar New Year Plant – Crinum superbum?

A variety of the giant crinum lily, Crinum asiaticum, has been turned into a Lunar New Year festive plant this year. In the nursery where it was being put on sale, the plant was labelled as C. superbum which I later found out that it is actually a synonym of C. asiaticum. It is a water-loving plant and is a member of the lily family, Amaryllidaceae. I was quite surprised to see it being offered for sale as a Lunar New Year festive plant because it has never been a plant that is traditionally associated with the festival and it also does not bear colourful flowers that are reminiscent of the arrival of Spring.

The placard that was pinned near the area where the plants were located provided a little insight. In a nutshell, the information written about this variety of  C. asiaticum is trying to link it to the edible, common leek (Allium ampeloprasum var. porrum). How this plant became a Lunar New Year requires some background about the plants and vegetables associated to this important festival in the Lunar calendar. The common, edible leek  is one vegetable that has a special and auspicious meaning with the Chinese. Its Chinese  name is called “大蒜” (da suan) where the second character has roughly the same pronounciation as the word “算” (count). Hence the Chinese who hopes to ‘count’ more money would want to eat this vegetable or at least buy a bundle to display at home during the Lunar New Year.

One is likely to ask how is a crinum plant linked to the leek and this peculiar relationship only becomes clearer if one bends down to take a look at the leafless pseudostem that is formed from the shedding of earlier generations of leaves. Without much imagination and effort, the fat stem with a swollen bulbous base does have a similar appearance as that of the edible leek, except that the crinum is not edible!

I was told that this C. asiaticum cultivar was imported from China and it bears the same white flowers as the ones we see here locally. What is different in this particular newly introduced cultivar is that the length of each strap-like leaf is a lot shorter and does not bend under its own weight. So what one gets is a compact and tidy rosette. The plant indeed looks nice on its own and makes a very good display specimen plant on its own. 

The larger and more handsome specimens are rather highly priced and because of their spread, one really needs the space at home to grow it. Such specimens look best if they are planted in an outdoor garden. Clever nurserymen did not forget about the majority of the Singaporean population who are high-rise apartment flat dwellers. They also have smaller potted specimens on sale too where these baby plants, probably propagated from the young offshoots that arise from the base of mature individuals, will appeal to and can be bought and displayed by apartment dwellers where space is a premium. Crinums are rather shade-tolerant plants. In an apartment setting, they are best grown in a location where they can receive at least filtered sunshine for 4 to 6 hours daily. 

Plants grown in the highrise environment are seldom bothered by pests. When grown outdoors.  crinums do get attacked by caterpillars and during the rainy season, by snails and slugs. All are chewing insects and they can quickly defoliate a plant. As long as the bulbs of plants are not destroyed by these pests, plants usually regenerate rather quickly with the emergence of a new flush of leaves.

Rewards from the Community Garden

It has been some time since I last blogged about the harvests gathered from my community garden at Serangoon North. My fellow community gardeners seemed exceptionally happy and satisfied this weekend because we had a bountiful harvest despite the unusually cool, dry and windy weather that we are experiencing now in Singapore over these couple of weeks. We had a hard time trying to keep up with the thirst of our plants.

Just last evening, we harvested two Chinese pumpkins and two different types of winter melon from the vegetable section of the community garden. The pumpkins were picked from vines that were grown from seeds taken out from  pumpkin slices bought from the local wet market. The smaller, green winter melon was harvested from a vine that was raised from seeds given to one of my community gardeners. It is a robust and high yielding variety. The larger winter melon that is covered with wax was picked from a F1 hybrid winter melon cultivar known as Known You’s “KY Trim No. 2″ bought from the seed company, Known You Seeds.

Besides just vegetables, we also had cut heliconia flowers for the first time. The clumps of heliconia plants were planted around of perimeter of the community garden last year and it took them about one year or so to adapt to the prevailing environmental conditions. The more established ones grew quite robustly during the last rainy season and also started flower rather profusely. Although the flowering heliconias are rather common species and cultivars, such as Heliconia rostrata, H. marginata x bihai ‘Rauliniana’, H. psittacorum x spathocircinata ‘Tropics’ and H. bihai ‘Nappi’, I witnessed how visually excited and happy that my community gardeners were when they were able to bring the beautiful inflorescences back home to display and enjoyed by everyone in the family.

Root Awakening (17 Jan 09)

The second instalment of the Root Awakening column on Straits Times Life! was published today and it provided answers to three gardening questions. The column also disseminated the various talks that are being conducted in HortPark to celebrate the upcoming Chinese New Year.

The first question was about the growing organic vegetables in pots. It is a problem to get truly organic-certified potting mix in Singapore. For practicality, one can only practise chemical-free vegetable gardening over actual organic gardening. To control pests and diseases, one can choose to use only non-chemical formulations, such as chilli and garlic sprays for the control of sucking pests and bicarbonate of soda solution for powdery mildews. Such concoctions are better as preventives.

The second question was about the presence of white coloured insects on a reader’s chiku tree. The most common white coloured pest that is encountered on fruit tree is perhaps the mealy bug. For a non-chemical way of eradicating them, one can spray a solution of white summer oil over them.

The last query was about lanky growth that was seen in jasmine plants. Lanky growth is most likely caused by the lack of light and probably the plant has been grown in an overly shady area, such as under a big tree. Due to the lack of light, plants will also respond by the refusal to produce flowers, even the correct type of fertiliser has been given.

 

New Lunar New Plant – Sanseveria cylindrica

 The cylindrical snake plant (Sanseveria cylindrica) is common plant that is available all year round in Singapore nurseries. It is grown by some people as an accent houseplant at home or as a medicinal plant by various community gardeners. The Chinese name of this plant is rather interesting as it has the meaning of “fairy’s pen” (仙人笔),which probably indicates the pencil-like shape of its leaves.

The cylindrical shape of this plants’ leaves are a result of a failure to express the genes that will cause the cylindrical-shaped leaf bud to differentiate dorsoventrally to produce the distinctive flat, blade-like leaves seen in other Sanseveria species. The leaves of this species spread out like a fan, that is quite unlike the rosette growth habit of other Sanseveria species.

This year, this sanseveria species has been turned into a Lunar New Year plant via a miraculous make-over process. Instead of its usual fan-shaped growth habit with its erect leaves pointing erect, they have been plaited up to form a braid-like tower. To prevent the leaves from unfurling, nurserymen actually tied the tip of the tower with some floral tape. To break the monotonous green colour, a red colourful ribbon was tied around it. 

This year, S. cylindrica has apparently became the new victim to join the gang of the “plaited Lunar New Year plants”. I was quite surprised when I saw the specimens and wonder how the very thick and stiff leaves were bundled together. It is quite unimaginable as it is impossible to bundle the already mature leaves together without breaking them!

I discussed this with a friend and she theorised that the plant had probably been grown under low light conditions for prolonged periods so as to yield long and flexible leaves that enable one to plait them together. Once that has been achieved, the plant is exposed to higher light conditions to harden the leaves.

Some years back, prior to the braided S. cylindrica, Pachira aquatica was offered as a festive Lunar New Year plant that was called the Money Tree (发财树) where the slender and flexible stems of several young P. aquatica plants are being bundled together. Another common houseplant that had been turned into a festive decorative plant by having its stems bundled together to make intricate “living” baskets was Dracaena sanderiana. 

The latter plant with its herbaceous stems seemed to be a popular subject for contortion. Still popular in the horticultural market today is the “turnaround lucky bamboo” (转运竹) which features a coiled segment located near the top end of a long stem-cutting.