Casey Bryce, University of Bristol
27.01.2024 - 05:07 / irishtimes.com / Fionnuala Fallon
In a world being reshaped by climate change, gardeners are increasingly asking themselves what can be done to counter the destructive effects of extreme weather events. The answer, as we’re discovering, is to take a nature-friendly approach that supports and nurtures resilience.
One obvious example is the use of paving in our front gardens, which often double up as much-needed car parking spaces. Unfortunately the widespread use of impermeable materials such as concrete and Tarmac contributes significantly to the problem of urban flash flooding, resulting in water run-off that puts huge stress on struggling urban drainage and sewage systems already under pressure. Not only can this also contaminate wildlife-rich waterways as a result, but it contributes to soil pollution, leading to less than ideal growing conditions for the plants in our gardens and cities.
Impermeable garden paving materials also contribute to the problem of soil shrinkage during prolonged dry periods, sometimes leading to problems with building subsidence. In urban areas in particular they compound the problem of summer heat extremes, interfering with the naturally cooling effects of the ground. If you’ve ever walked down a city street in a heatwave you’ll have experienced this first-hand.
In this case the best solution is to replace garden paving materials such as concrete, Tarmac and tiles with any of a variety of permeable materials that allow water to naturally percolate through the soil. Examples include pebble or gravel laid on to an “open-graded” permeable hardcore base; pebble or gravel laid on to a moulded plastic or concrete “honeycomb” structure of interlocking cells that stabilises the ground and makes it suitable for heavy traffic (these
Casey Bryce, University of Bristol
Q: Any advice on the best way to tackle creeping buttercup without using weed killer? It’s starting to take over some of my flower beds, where it’s smothering perennials and smaller shrubs. MJ, Co Kilkenny
You can sense it in the slowly stretching evenings, the higher skies, the shifting quality of light, and the noisy chatter of birds. And you can see it in the flowering hellebores, witch-hazel and sweetly perfumed daphne, as well as the snowdrops, daffodils, cyclamen, aconites, crocuses and dwarf irises that have pushed their snouts through cold, wet soil to burst into determined, brilliant bloom.
The soil must have adequate drainage; otherwise, air may be excluded, and the more beneficial micro-organisms may be destroyed. Soils which have poor drainage are often sour and acid. It will be necessary to improve this acidity by applications of hydrated lime. Wet soils are cold ones, and this means that plant growth is severely retarded. The situation is even more critical in the northern, colder parts of the country. Waterlogged soils cause roots to rot and a combination of all these problems can produce complete failures in some gardens.
Q: Could you please recommend a good peat-free seed compost? I’ve tried a few over the last few years but haven’t had great results. I’d really like to do the right thing environmentally but am now at the point where I’m sorely tempted to go back to using a conventional peat-based compost. CF County Kerry
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