GREEN WALLS AND ROOFS BHT256

Course CodeBHT256
Fee CodeS2
Duration (approx)100 hours
QualificationStatement of Attainment

There are lots of different reasons for creating a vertical garden or roof garden, and the way you develop the garden may be affected by the reason you create it. Common reasons might be:

  • Lack of space for a more extensive garden
  • To improve aesthetics of an ugly place (wall or roof)
  • Improving physical environment (eg. Reduce glare, modify temperature, filter air pollutants, reduce water run off and mitigate flood problems)
  • Urban farming –growing crops in an urban area

This is an excellent course for landscapers, interior plant scapers, environmental managers, architects, engineers, horticulturists or anyone else interested in learning about this fascinating subject.

Lesson Structure

There are 9 lessons in this course:

  1. Scope & Nature of Roof and Vertical Gardens
  2. Construction Functional and Appropriate Vertical and Roof Gardens
  3. Climbing Plants and Structures for climbing
  4. Plants Suited to Roof and Vertical Gardens
  5. Adaptations for Other Plants in Roof and Vertical Gardens
  6. Container Growing
  7. Maintenance –watering, pest control
  8. Applications/Landscaping –Roof Gardens
  9. Applications/Landscaping –Vertical gardens

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

  • Discuss the nature and scope of vertical gardens and roof gardens in horticulture today.
  • Explain engineering considerations involved with the building of vertical and roof gardens, both on small and large scale projects.
  • Select appropriate materials and plan the way in which the non living components of the garden is created, in order to achieve an appropriate and sustainable
    • installation.
  • Select appropriate climbing plants for creating vertical or roof gardens, and determine appropriate strategies to cultivate those plants, in a variety if different situations.
  • Select appropriate plants for use in vertical or roof gardens, which are tolerant of the adverse growing conditions, having natural adaptations to growing under conditions that are encountered in these gardens.
  • Select and plan the cultivation of plants that lack natural adaptations to growing on roofs or vertical gardens; but which are none the less required to grow in these adverse conditions;
  • Explain a range of container growing techniques, in a range of different roof and vertical gardens, that may be used with a selection of different types of plants.
  • Identify and evaluate problems with vertical and roof gardens, and compare options for solving those problems
  • Plan the development of roof gardens for both small and large scale applications.
  • Plan the development of vertical gardens for both small and large scale applications.

Is the Building Suitable?

For a building that was not originally designed to support a green roof or wall:

  • You need to calculate the load (force or weight) at different points (where a garden attaches to or places a load on a building), and determine what structural requirements are needed at those points.
  • Upgrading the structure to deal with those increased loads must then be calculated.
  • Creative strategies might be considered to reduce the load to be created (e.g. lightweight potting materials, shallower potting media with automated irrigation, lightweight containers (e.g. fibreglass rather than concrete or ceramic), etc.
  • Creating a garden that can be supported by an old building, will often be excessive, and cause a project with older architecture to be abandoned.
  • Many green wall solutions involve the use of frameworks which are not attached to the building itself. Rather these are steel frames which are free-standing and sit close to the wall so they look as though they are attached, or at least the plants appear to be growing up the face of the wall. These frameworks are supported by the ground rather than the building but if used on balconies then loads may have to be calculated
  • Other problems might include the location of air-conditioning vents and exhaust pipes. Heat and fumes emitted might scorch plants in the immediate vicinity and cause physiological disorders. In the case of a green wall it may be possible to use plastic plants around such openings so as not to destroy the effect of continuity. On roofs, it may be possible to box around such areas using decorative trellis or something similar.
  • Buildings also offer an opportunity to harvest resources such as rainwater and solar radiation to generate power. For buildings which cannot takes heavy loads on the roof, it may be feasible to collect water in tanks at ground level, or below ground level, and pump it up for use in green walls and roof gardens. Solar panels may be used to harness power used for pumps and irrigation systems. It is likely that future city apartment blocks will be built to make the most of these resources for greener cityscapes.

​​

WHAT PLANTS DO YOU USE?
The plants you choose to use will depend upon climatic, structural and aesthetic considerations for the roof or wall.

Climate
In cool, wet and humid environments, plants are less likely to suffer water stress but in dark, dry, hot and windy conditions it can be extremely difficult to keep any but the hardiest plants from suffering. Whilst this applies to plants growing outdoors, those growing indoors also suffer if grown in less than perfect environmental conditions.  For instance, those growing inside under air conditioning, next to heaters, in drafty locations, or in dusty environments, in homes and offices, foyers, lobbies, shopping complexes and restaurants may all suffer.

Green walls or roofs can be subject to microclimate variations caused by:

  • Shadowing – from surrounding buildings or trees.
  • Reflection/radiation – metal, glass, and masonry can all reflect or radiate heat causing hot or cool spots
  • Exposure – tall buildings can reduce or change wind patterns; those growing high up may be under more wind stress. Less ventilation can change air quality.
Structural
 Large roof or wall gardens with a large biomass will require more growing media for the roots, will have more weight in the live plant tissue, and need a much stronger structure to support the inevitable increased weight. Creating a garden on the roof of a hotel, with shade trees, and much more, will no doubt be more expensive, and more complex than installing a cover of low growing succulents across the roof of a gazebo.

Aesthetics
 Some plants like many of the succulents and bromeliads look good with little attention; while others such as ferns may not as their vigorous growth means more production of older leaves dying back (which are unsightly and untidy),  as the new ones develop.

If a plant dies and needs to be replaced in the middle of a small roof or wall garden; you may be able to effect the change with a step ladder; but for a large installation, it may be necessary to use a travel tower or crane to replace the dead or ugly plant. This set up of equipment may also be needed periodically the change the display plants depending on the effects created with the display plants.

 
 

OPPORTUNITIES

Green walls and roofs have become an extremely important part of urban horticulture over recent decades. 

Bringing significant quantities of vegetation into cities not only improves the aesthetic, but also improves air quality. Plants filter pollutants and produce oxygen. We know from international studies that most people are breathing poorer quality air than a hundred years ago.There are many reasons for this. Clearly the value of greening our cities is great, and the demand for green walls and roofs is set to continue.

This course is a valuable, unique foundation for anyone working in urban horticulture, including:

  • Landscape Designers
  • Landscape Contractors
  • Nurserymen
  • Horticultural Consultants
  • Gardeners
  • Interior Plantscapers
  • Horticultural Allied traders(anyone supplying equipment or materials for green walls or roofs)
  • Property Developers
  • Town Planners
  • Architects
  • Building Contractors
  • Civil Engineers

 

 
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Meet some of our academics

Adriana Fraser Adriana has worked in horticulture since the 1980's. She has lived what she preached; developing large gardens and always growing her own fruit, vegetables and herbs; and making her own preserves. In 1992 she formalised her training by graduating with a certificate in horticulture; and a few years later, completing an Advanced Diploma in Horticulture. Adriana has worked across a broad spectrum of the horticulture industry; and has developed a strong network of contacts in horticulture around Australia and beyond. She has written and contributed to many books and magazine articles; and at one stage managed the national collection of Thyme. She has a passion for plant knowledge and sustainability and an inert understanding of how people learn about horticulture. Adriana has been a tutor with ACS since the mid 90's and based on the feedback from past students has been an overwhelming success in helping people develop their skills and further careers in horticulture.
Bob James Bob has over 50 years of experience in horticulture across both production sectors (Crops and nursery) and amenity sectors of the industry. He holds a Diploma in Agriculture and Degree in Horticulture from the University of Queensland; as well as a Masters Degree in Environmental Science. He has worked a Grounds Manager at a major university; and a manager in a municipal parks department. Over recent years he has been helping younger horticulturists as a writer, teacher and consultant; and in that capacity, brings a diverse and unique set of experiences to benefit our students.
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.


Check out our eBooks

Climbing Plants“A doctor can bury his mistakes, but an architect can only advise his clients to plant vines.” ― Frank Lloyd Wright This e-book is a wonderful guide to climbing plants. Complete with full colour photographs, it is ideal for the home gardening enthusiast, landscape designer, or architect.
Garden Design Part 1This stunning full colour Garden Design ebook is full of useful tips, information and inspiration. It contains around 300 colour illustrations! It is comprised of three parts: Design, How a Garden Functions and Aesthetics (making it look good).
Garden Design Part 2Part 2 of the Garden Design Series is an inspiring accompaniment to the first book, but works equally well in its own right. It's brimming with ideas and practical advice for designing a wide variety of different gardens. You will learn about different styles of gardens and how to create a style to suit a site or client. It contains around 300 colour photos! Written by John Mason over several decades of visiting and photographing gardens, writing, teaching and creating gardens.
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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