Life Hack: How to remove algae from patio slabs and concrete ahead of the longer evenings

Tips on removing algae and preventing its growth in your outdoor areas

Algae can build up on patios, concrete and other surfaces in shady areas that don’t get a lot of sunlight

With the clocks changing over the weekend, I’m already dreaming of long spring and summer evenings spent relaxing in the garden — just keep your fingers crossed for good weather this year. However, the patio area in my own garden is in need of some TLC after a long damp winter as some corners have developed patches of green algae, a common problem in Irish gardens due to our climate.

Algae, as well as moss, can build up on patios, concrete and other surfaces in shady areas that don’t get a lot of sunlight (for example, my patio in winter). Porous surfaces, like sandstone and limestone, allow more air and moisture into them too, leading to a buildup of algae. Generally, the build-up of algae is more likely to happen during the autumn and winter months as there is less sunlight and more rain.