TROPICAL PLANTS

Course CodeBHT234
Fee CodeS2
Duration (approx)100 hours
QualificationStatement of Attainment

Distance Education Course:  Become a Tropical Plants Expert

  • Learn to identify and grow different tropical plants
  • Learn to use tropical plants in gardens, as indoor plants, container specimens, etc.
  • Follow your passion, or work with tropical plants as a career
  • A course for nurserymen, plant breeders, landscapers, gardeners, interior plantscapers, or anyone with an enthusiasm for tropicals.

 

Tips for Growing and Using Tropical Plants

Lush growth, vivid colours and a warmth in the air which makes anyone feel relaxed; these are what we strive for in a tropical garden. All too often though, we get uncomfortable sweltering heat, wilting plants and armies of insects that eat the garden faster than it grows. This book shows you how to get closer to the first of these options, and ways of overcoming those problems which are particular to gardens in warm climates.

 

TROPICAL AND SUB TROPICAL GARDENS

Before reading any further, you should decide what you want a garden for. Some people have a dream, an image of an "oasis" to escape the heat, or the problems of daily life. Others want a garden they can use, for entertaining, outdoor living, for children to play in or maybe even a place to keep a prized collection of plants. Whatever your purpose, it is important to plan. Planning never stops either, because a garden never stands still. Try to foresee what will happen in your garden in the future (eg. trees and shrubs which will die, areas that will gradually become more shaded), and plan changes to your garden accordingly.

TYPES OF GARDENS AND PLANTS

There are many different types of gardens. You might choose to have any of the following; or perhaps a garden which has aspects of more than one type.

FORMAL OR INFORMAL

Formal gardens are neat and tidy, the edges of paths and garden beds are usually very well defined, and the garden is often a symmetrical design (ie. one part of the garden is a mirror image of an adjacent part). Shrubs are often clipped to develop a specific shape as a hedge or trained against a wall.

Informal gardens are not always so neat, edges are often irregular shapes with plants spilling from beds onto lawns or paths. The overall affect is less manicured and if designed properly things do not look so unattractive or out of place even when maintenance is neglected for a period.

Gardens can have varying degrees of formality. Generally the most formal gardens are the most time consuming to maintain.

BUSH GARDENS

These try to recreate a natural environment. It is important that you choose a theme and stick to it otherwise the garden may look quite nice but be a meaningless assortment of plants. Many of the best native gardens are modelled on real bush examples (eg. An open woodland, a dense forest, rainforest, heathland or rockery).

DRY GARDENS (Xeriscapes)

A xeriscape is a garden which is developed for harsh dry conditions. It uses plants which tolerate drought and heat. (eg. Cactus and succulent garden, Desert garden, Australian Native Arid Zone Garden).

ORGANIC GARDENS

This is a garden which uses only natural materials in it's creation and maintenance. It is free of pesticides and artificial chemicals. Mulch and compost are used to feed plants, smother weeds and reduce the need for watering. Other natural techniques are used to minimize pests and diseases. Those problems which occur beyond this are simply tolerated in the knowledge that nature will eventually re-establish a balance.

PERMACULTURE

Permaculture gardens are designed to produce things which can be used (eg. food, crafts, fuel, etc), and to create an environment which is protected from undesirable affects of nature (eg. extreme wind, heat, flood, etc). It doesn't really matter what a permaculture garden looks like, as long as it is functional, environmentally friendly and relatively low maintenance.

COTTAGE GARDENS

Cottage gardens originated in temperate climates, but the style has evolved and been adapted successfully in hotter places. These are low maintenance gardens, which mix a wide variety of flowers and other useful plants (including fruit and vegetables), creating a montage of colours and textures. They usually contain little or no lawn, lots of colour, a large variety of textures and colours, edible and scented plants, and a variety of traditional features such as trellis, wrought iron, picket fencing, cast iron furniture, statues, topiary, low hedges, sundials and birdbaths.

COMPANION PLANTING

Companion planting is based on the idea that certain plants grow better in close proximity to other plants. (eg: Garlic planted under a peach tree will improve the performance of the peach by deterring the development of peach leaf curl, a disease which is very common on peaches). Companion planting works by using plants which either deter pests or disease, attract pests away from valuable plants, or contribute to the fertility and structure of the soil.

SPIRALS

A spiral garden is a raised or sunken garden where the plantings form a spiral either rising up the mound or sinking into the depression. The spiral is delineated by a wall (stone, timber, masonry) which both serves to retain the earth on the slope and also to separate one area of garden bed from the adjacent area (which is at a higher or lower level).

Water which falls onto the highest point of the spiral will always tend to run down hill (in a spiral), collecting at the lowest point. The highest part of a spiral garden is generally the driest (hence is planted with plants which prefer drier conditions). The lowest point of a spiral (particularly in a sunken garden) is the wettest (hence is planted with plants tolerant of wet conditions, or preferring wet soil).

NO DIG GARDENS

In simple language, this type of garden is made by making garden beds using deep compost heaps on top of the ground. Plants are then planted straight into the top of these mounds. As they slowly rot down the mounds release a constant supply of nutrients to feed plants, and being raised above ground level they provide good drainage while the organic matter still retains ample water for the roots.

ORIENTAL GARDEN

Japanese and Chinese gardens each have their own unique style, but both share similar principles. These gardens emphasise nature. Materials (plants, rocks, gravel, water etc) are used in a very natural way where harmony and tranquillity are primary aims. These gardens are much more common in cooler areas, but with a bit of perseverance, a garden with such a theme may be possible in the tropics.

MIDDLE EASTERN GARDEN

Typically formal and ornate, these gardens make extensive use of tiles and garden structures. Pergolas or other structures are often incorporated for shade, water is usually included for coolness, and the garden is often walled for security and privacy.

WALLED GARDEN

Walls create a sense of enclosure in a garden, and also create a protected environment, restricting air movement (ie. wind). In hot areas a walled garden may look great but must be designed carefully if it is to avoid becoming a heat trap.

 

Lesson Structure

There are 10 lessons in this course:

  1. Introduction to Tropical Plants
    • What does the term "tropical" mean
    • What tropicals grow where you live?
    • Plant names/classification (scientific & common)
    • Species, hybrids, varieties and cultivars
    • Growing Tropical Plants in different climates; tropical, sub tropical, arid and temperate
    • Climatic Variations; seasons, mountains, savannahs, rainforest, coastal
    • Gardening for Warm Climates and Microclimates
    • Good and Bad News about Tropical Gardening
    • Heat Traps, Warming a Garden, Greenhouses
  2. Plant Cultural Practices
    • Common Gardening Problems
    • Understanding soils, naming a soil, texture, pH, fertility, nutrition, feeding
    • Water and Plant Growth
    • Water deficiency and excess symptoms
    • Water Dynamics in a Soil
    • Planting and Plant Establishment Methods
    • Light Requirements
    • Mulches
    • Tree Guards
    • Weeds
    • Propagation,cutting, seed, propagating media
    • Potting Mixes, Potting up, Caring for young plants
    • Pruning etc.
  3. Tropical Annuals, Perennials, Bulbous Plants, Bamboos & Lawns
    • Bamboos, Grasses and Grass Like Plants
    • Landscaping with Bamboos
    • Review of Bamboo species
    • Review of other herbaceous tropicals, including: Achmines, Agapanthus, Alocasia, Amorphophallus,Aristea, Babiana, Boophone, Brunsvigia, Caladium, Calaqthea, Calostemma,Clivia, Calocasia, Crinum, Crocosmia, Cyrtanthus, Dierama, Eucharis, Eucomis, Gladiolus, Gloriosa, Zephranthes, Hippeastrum, Hymenocallis, and many others
    • Lawns
    • Turf Varieties for Warm and Hot Areas
  4. Ornamental Gingers and Heliconias (and related plants)
    • Introduction
    • Zingerbales; Musaceae (bananas), Strelitziaceae (bird of paradise), Lowiaceae, Heliconiaceae (heliconias), Zingiberaceae (gingers), Costaceae (costus), Cannaceae (cannas), Marantaceae (prayer plants
    • Gingers
    • Heliconia
    • Costus
    • Canna
    • Strelitzia
  5. Cordylines, Palms & Cycads
    • Types of Palms; self cleaning, cleaning, solitary or clumping, fan or pinnate, etc
    • Palm Propagation
    • Review of many cultivated Palm Genera
    • Cordylines
  6. Climbers, Shrubs and Trees
    • Review of many cultivated Tree and Shrub Genera
    • Cultural Requirements
    • Review of many selected species characteristics
    • Conifers; culture, genera, species
    • Climbers; Allamanda, Antigonon, Aristolochia, Beaumontia, Bignonia, Bougainvillea, Campses, Ceropegia, Cissus, Clematis, Clerodendrum, Clitoria, Clytostoma, Combretum, Congea, Ficus, Hoya, Ipomea, Manettia, Mucuna, Pandorea, Philodendron, Scindapsis, Stephanotus, Thunbergia, Trachelospermum.
  7. Orchids, Ferns, Aroids and Bromeliads
    • Orchid introduction
    • Growing Orchids
    • Epiphytes
    • Orchid Genera
    • Bromeliads
    • Growing Ferns
    • Types of Ferns; Fern Classification and families
    • Fern Culture
    • Aroids
  8. Tropical Herbs, Vegetables and Fruit Bearing Plants
    • Growing Methods; organic, no dig, permaculture, Container Growing, Hydroponics, etc
    • Culture of Selected Vegetables in tropical and sub tropic conditions
    • Bush tucker
    • Tea and Coffee
    • Tropical Fruit trees
  9. Growing Tropical Plants outside the Tropics
    • Growing tropicals indoors
    • Growing in different climates and conditions.
  10. Landscaping with Tropical Plants
    • Use of colour & texture
    • Plant selection
    • Planting a courtyard
    • Preparing sketch plans.

Each lesson culminates in an assignment which is submitted to the school, marked by the school's tutors and returned to you with any relevant suggestions, comments, and if necessary, extra reading.

Aims

  • Explain the nature and scope of tropical plants
  • Discuss cultural characteristics that are often peculiar to tropical plants
  • Describe the taxonomy and culture of a range of soft wooded tropical plants including annuals, perennials and bulbs.
  • Describe the taxonomy and culture of Heliconias and Gingers..
  • Describe the taxonomy and culture of Palms and Palm like tropicals.
  • Describe the taxonomy and culture of climber, tree and shrub tropical plants.
  • Describe the taxonomy and culture of Orchids, Ferns and Bromeliads.
  • Describe the taxonomy and culture of Herbs, Vegetables and Fruits in tropical conditions.

Tips for Growing Trees in a Tropical or Sub Tropical Garden

 
People frequently have more trouble with trees than any other part of the garden. If they like trees, they tend to plant too many trees too close together. If they don't like trees, they tend to plant too few. It is important to consider why you might need trees, and then choose the appropriate number, type and sizes to suit your requirements and the size of your garden.
 
 
Trees are used for the following reasons: 
  • A screen for wind - wind will go over or around very dense vegetation. Wind goes through, and is slowed by less dense plantings.
  • A noise screen - don't expect a complete barrier to noise. Plants reduce volume, but they don't completely stop noise.
  • A screen against fumes - if you are beside a major road or factory, trees are essential to keeping air quality reasonable in your backyard.
  • To hide ugly views - canopies can cut out ugly views (e.g. tip sites, factories or unkempt neighbouring properties).
  • To provide privacy - plant wherever people are going to be able to see in.
  • To create a visual link with adjacent areas - if there is a treed area just outside of your property, plant some trees adjacent to those plantings, but on your property. This creates one clump of trees which starts on your property, then extends beyond the boundary, giving an illusion of your property being bigger than it actually is.
  • To create an ecological link (corridor) with nearby areas - if you plant trees which supply food and shelter for nearby wildlife, you will find that wildlife will move into your property.
  • To frame views - if you have a valuable distant view (e.g. mountains or the ocean), plant trees either side of the line of view to enhance and direct your attention towards that view.
  • To provide features in the garden - large well-formed trees when planted alone in a lawn or amongst small plants will create an impression of grandeur which draws the eye. Smaller trees have the same effect when they provide a contrast in colour (i.e. in foliage of flower), or texture against whatever is around them.
  • To provide shade - shade is important, to protect other plants, and to provide a more comfortable atmosphere for people. Too much shade can deter plant growth, restrict the movement of fresh air and lead to water problems (because the ground does not dry out).
 
 
Suggested Trees for Tropical Gardens
 
Araucaria heterophylla  -8m or taller, Green foliage
 
Banksia integrifolia  -10 to15m tall, Spiky foliage, Yellow brush like flowers
 
Bauhinia variegata  -to 10m tall,  Green foliage, Pink flowers
 
Brownea grandiceps  to 5m  tall, Weeping foliage, Red flowers
 
Callistemon viminalis  -to 7m  tall, Weeping foliage, Red bottlebrush flowers
 
Cananga odorata   -to 15m,  Semi-weeping,   Lime flowers
 
Caesalpinia ferrea  - to 8m,   Deciduous foliage,   Yellow flowers
 
Cassia fistula   -to 6m tall, Deciduous, Yellow flowers
 
Casuarina glauca  -to 15m,     Fine needle like foliage, weeping habit, insignificant flowers.
 
Delonix regia  -to 12m tall,  Red-orange flowers 
 
Dombeya wallichii   -to 10m tall, Matte-green foliage, Pink-red flowers
 
Erythrina indica  -to 8m,  Orange flowers 
 
Ficus benjamina   -15m rall, spreading, Weeping glossy green foliage, Red fruits
 
Hibiscus tiliaceus  to 7m tall, Green foliage, Yellow flowers
 
Jacaranda mimosifolia  -15  to 18m tall, Fern like leaves, Purple flowers
 
Lagerstroemia indica 7 to 10m tall,  Deciduous,   Showy flowers of varying colours.
 
Mangifera indica  -to 20m, Foliage with red tips when young, Scented white flowers
 
Plumeria rubra, (P. obtusa)  -5 to 7m  tall, Green foliage, Flowers can be white, yellow, red or other colours
 
Spathodea campanulata  to 8m,   Orange/red flowers 
 
 

WHAT IS SO UNIQUE ABOUT WARM CLIMATES

Warm climates all have one thing in common; they get hot during the day. Apart from this they can vary a great deal from place to place. There are places in the sub tropics which can record very cold temperatures at night (eg. Desert areas and high mountains); and there are places which are extremely dry as well as places which are very wet.

Generally light levels are higher, and day lengths don't shorten or lengthen to the same extremes that they do in cooler climates.  Wherever there is water in a hot climate, humidity can increase. Humidity can be good for some plants and bad for others; and will be greater in wet climates, after rainfall, near lakes and canals, in irrigated areas or around plants which are mulched with moist organic materials.  Storms can be more fierce in the tropics. Rain often falls heavier, winds blow stronger, and plants can be badly damaged by cyclonic conditions. Summer, Autumn, Winter and Spring don't seem so obvious in warmer climates. There are really only two, more obvious seasons: the wet and the dry. All of these factors can have serious affects upon the way some plants perform.

 

WHAT CAN YOU GROW EASILY?

The best way to know what grows well in your locality is to look around at other gardens in the area, and note what other people are growing most successfully.

Many plants grow much faster and easier in hot climates than in temperate areas; but often the diseases, pests and weeds will also develop faster. Some plants listed in this book can in some areas grow so well that they become invasive and turn into weeds. The easiest plants to grow are not always the most vigorous.

Remember vigorous plants may require frequent cutting back. Look for plants which are generally resistant to pests and diseases, tolerate adverse conditions, but do not grow so vigorously that they become invasive.

Meet some of our academics

Bob JamesHorticulturalist, Agriculturalist, Environmental consultant, Businessman and Professional Writer. Over 40 years in industry, Bob has held a wide variety of senior positions in both government and private enterprise. Bob has a Dip. Animal Husb, B.App.Sc., Grad.Dip.Mgt, PDC
Gavin Cole Gavin started his career studying building and construction in the early 80's. Those experiences have provided a very solid foundation for his later work in landscaping. In 1988 he completed a B.Sc. and a few years later a Certificate in Garden Design. In the mid 90's he worked as a manager and garden designer with the well respected UK company -The Chelsea Gardener. A few years later he formed his own garden design business, at first in the UK, and later operating in Queensland Australia. He has since moved to, and works from Adelaide. Apart from his work in landscaping, Gavin has been a prolific garden writer and a tutor with ACS Distance Education since 2001. He is currently part of the team of garden experts that produce Home Grown magazine.
John Mason Parks Manager, Nurseryman, Landscape Designer, Garden Writer and Consultant. Over 40 years experience; working in Victoria, Queensland and the UK. He is one of the most widely published garden writers in the world; author of more than 70 books and editor for 4 different gardening magazines. John has been recognised by his peers being made a fellow of the Institute of Horticulture in the UK, as well as by the Australian Institute of Horticulture.
Marie BeermanMarie has over 10 years in horticulture and education in both Australia and Germany. Marie has been a co author of several ebooks in recent years, including "Roses" and "Climbing Plants". Marie's qualifications include B. Sc., M.Hort. Dip. Bus. Cert. Ldscp. PDC


Check out our eBooks

Trees and Shrubs for Warm PlacesA stunning book with around 300 colour photos! A comprehensive reference to thousands of tropical plant varieties (mostly different information to the Tropical Plants book) . An classic reference for nurserymen, landscapers, interior plantscapers, horticulturists and any tropical plant enthusiasts. 209 pages
Tropical LandscapingTropical Landscaping is a style that may be used more in tropical places, but can still be created in cooler climates. This book provides practical advice and inspiration over 8 chapters: “Garden Design”, “Components of a Tropical Garden”, “Building the Garden”, “Outdoor Living Areas”, “Pools, Ponds and Water Features”, “Lawns”. “Plants (to use), and “Caring for Plants”. 103 pages 69 colour photos
Tropical PlantsThis luscious, illustrated ebook covers hundreds of different plant genera, and many more cultivars. You will learn how to grow plants commonly cultivated in the tropics and subtropics. It contains everything you need to know about growing tropical plants, managing them and working with them (they can be a little temperamental). Many of the plants can also grow in milder climates as indoor plants or in protected places. Previously published in print form by Kangaroo Press (Simon and Schuster).
What to Plant WhereA great guide for choosing the right plant for a particular position in the garden. Thirteen chapters cover: plant selection, establishment, problems, and plants for wet areas. Shade, hedges and screens, dry gardens, coastal areas, small gardens, trees and shrubs, lawns and garden art.

 

 

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