Are We Being Efficient Enough With The Use Of Water In Our Gardens?

Water has always been an essential and defining element of our landscapes and gardens. It’s a symbol of wealth and power, personified in the great European houses of le Notre’s Versailles and Vaux le Vicomte and the great English parks such as Lord Carlisle’s heroic Castle Howard. It’s an expression of the art of garden design seen in the 20th Century modernism of Thomas Church in California and Louis Barragan in Brazil. And it’s a defining feature of architecture that so often sets a building in the context of the landscape. Aesthetically water creates reflection; it often calms the spirit but can also create dramatic force and vitality. It brings stillness and movement, cooling and focus to a space. It is essential to the life of a garden, for plants and wildlife.

But for much of the past 100 years we have taken the availability of a ready supply of water for granted, particularly in the western world where we have become increasingly detached from where our resources come from. This is particularly true of the supply of fresh water and food. In our gardens we have had a ready supply of water with only moderate climatic changes that cause a little discomfort. Why worry about a brown lawn when there is a ready supply of irrigated water to keep it green? Indeed we have become so complacent about water that the ‘water feature’ has become a derided element of the contemporary garden.

In modern times our relationship with water, as individuals, communities and nations, is changing quite dramatically. We are quite rapidly moving from an emphasis on the aesthetic nature of water to a concentration on the practical power of water. Biodiversity has become a watchword in the future battle to save the planet from the destructive way in which we live our lives. Crucially it has been identified that the five major ecosystems; forest, coastal, agricultural, grassland and fresh water are all seriously threatened and leading thinkers and bodies believe that the single issue of water will increase the likelihood of global conflict between countries. Water demand in the majority of European cities is now exceeding the rate at which it can be replenished. Major cities such as Mexico City, Bangkok, Manila and Shanghai are all reported to be at potential risk of major supply challenges and it has been predicted that by 2025 two out of every three people on the planet will live in water-stressed areas.

Most importantly we are starting to understand this on an individual level because we are experiencing the impacts of climate change on our own lives. In the past 10 years climate change is characterised for most of us by extreme weather. As a garden designer with offices in the UK, Mediterranean and the Caribbean I am experiencing these rapid, diverse changes in weather and water supply everywhere. In the UK we have moved from a drought in 2006 where hosepipes were banned in the south of England to one of the wettest winters on record in 2007. At the same time we are battling to establish plants and trees in Cyprus because there has been no rain for 12 months. And in the Caribbean, we are experiencing increased hurricane activity and sporadic rainfall.

Regionally we are experiencing extremes of flooding and drought within very short periods of time where one year we are banned from using hosepipes and cleaning cars and the next we are experiencing the destruction of homes and property from flood waters. It is this impact on our lives that has started to change our view of water as a limitless supply that arrives at the turn of the tap.

If we are going to take individual responsibility then the place to start is in our homes and gardens. Essentially this means catchment and conservation. Harnessing the water we have and then conserving and using this water in the most efficient ways.

We are only just starting to recognise the need to harness water in our homes. Whilst water companies struggle to replace worn out pipes we are preserving our own supplies by storing rainwater in systems as simple as water butts supplied from downpipes and as sophisticated as large underground filter systems. Commercially the latter has been going on for many years but it only now that a combination of lower costs, awareness and planning directives are causing us to install large storage systems within residential gardens. Ten years ago a client of mine, a water company executive, installed a 1,000 cubic metre tank beneath his lawn and we could not understand his reasoning. Now we get it.

Of course water catchment is only part of the story. We need to use the water and in most part that stored water has been used for gardens in periods of drought, and where metered, as an alternative to paying for supplies. However, we are increasingly seeing a wider use of that water, not just for plants and lawns but also for secondary uses, taken into the home to flush toilets etc. What this means is that we are being asked to accommodate larger underground tanks within gardens.

In contrast to recent developments in water harnessing we have been aware of using water wisely since the 1970s. Efficient toilet systems are widely used throughout Europe but this alone is too little for today’s challenges. In the garden our most important use of water is for plants, and of course plants are part of the solution to climate change but the use of water for plants is a primary target for the water companies and politicians. Irrigation companies have been fighting a rear guard action for many years as they are often accused of inefficient use of water. As designers we actually find that our clients do not know how to water a plant properly and irrigation systems use water much more wisely than someone with a hosepipe.

The Royal Horticultural Society (RHS) in the UK does much to encourage efficient watering. Garden water use is estimated at less than 3% of the annual water consumption of an average household but at peak times as much as 70% of water supplied is used in gardens. Water supply records indicate that peak demand begins in the evening after two weeks without rain in summer. This surge in demand can lead to water companies being forced to deplete groundwater and streams, which can cause serious environmental harm. As the RHS says “The cost of this peak demand has to be born by water users. In the wider interests of the environment and for the use of water in the garden to be acceptable to other water users, gardeners should use mains water as sparingly as they can.” The RHS urges gardeners to make economical use of water by understanding the needs of plants and taking steps to reduce the loss from plants and the soil.

The politics of water within different regions varies widely. In the UK there has been an ongoing debate about hosepipe bans for two years now. Promised reforms have led to a relaxed system but no actual legal framework which leaves planners and gardeners in limbo. More encouragingly garden designers and gardeners are taking the concept of water conservation and use into their own hands and using water wisely. Garden designers in particular are counteracting the lack of water and the cost of water supply by specifying alternative measures within their designs. At a basic level this includes mulching the soil around plants to conserve water in the soil. At a creative level there has been a surge in the design of dry gardens and waterwise planting.

Dry gardens use plants efficiently to reduce, or often remove, the need for artificial irrigation. They rely solely on rainfall and good examples are Mediterranean aromatic gardens. Waterwise planting is a concept that is taking on more importance in the conservation of our water and soil. If you visit a South African garden you will notice much denser planting that encourages stronger root systems and retention of moisture in the soil.

Both of these planting methods are essentially for ornamental plantings. Forest gardening on the other hand has many of the same principles but is a method of planting on different levels from low growing ground cover to tall trees capable of providing a sustainable, low maintenance environment for food production. It is essentially a great source of food, a sustainable method of conserving resources including water and whilst used for centuries in countries such as Indonesia it is relatively new to the western world. In a time when we are all worried about the supply of food it is predicted that this system of gardening will become wider spread.

We should not forget that there is still a place for the aesthetic use of water in our gardens and landscapes. Ponds and water fountains, swimming pools and spas will still have a role to play. And whilst we are swapping the outdoor patio heater for a sweater as a necessary contribution to halting global warming we are not prepared to give up all the pleasures of the garden in the name of climate change. We are, however, changing the way in which we design these elements. Most notably natural ponds and pools have become the latest must have for those wanting the ubiquitous trophy garden. Natural pools harness the power of plants to clean their water without chemicals. In a world where we are more aware of the toxic effect of chemicals we are seeing clients moving towards natural pools in increasing numbers and, in some cases, converting existing pools to natural systems.

Water is essential to life in a garden. We cannot expect to enjoy birds and wildlife in our gardens without it. Our gardens are the largest free wildlife sanctuary we have in many countries, especially crowded countries such as the UK where we are steadily losing space and greenbelt agricultural land provides too few wildlife habitats. We are finding that demand for formal ponds is starting to fall but conversely natural wildlife-friendly ponds are in