Why does my patio keep turning green?
Depending on your garden’s layout, which way it faces and the amount of sun it does or doesn’t get, you’ll probably find at some time in the year, it turns green. Is it green mold, mildew or algae? Known as Green algae, this green slime will grow whenever we have a prolonged period of wet weather. Which, if you live in the UK, is almost guaranteed at some point in the year! If you’re lucky enough to live in a warmer climate, you won't suffer from the same problem.
Areas in the garden that are north facing and lack sunshine will suffer more than areas that get more sun.
Why is my patio so slippery?
Organic growth that grows on your patio over the winter months can cause your patio to become slippery. Green algae is the main culprit, but over time, other organic growth such as black lichen (black spots) and white fungi can turn your patio and paths slippery and hazardous. Not idea for the children or elderly relatives.
What is green algae?
Green algae are simple, photosynthetic organisms that thrive in moist, sunny environments. They’re typically found in bodies of water, such as ponds, lakes, and oceans, but they can also grow on hard surfaces like patios, decks, conservatories and on fences around your property. Most water features will suffer from the same problem.
How to get rid of green algae?
We would recommend Patio Black Spot Preventer for removing green algae. This is a spray and leave treatment that must be applied every 11-12 months. Applying each spring after the wet weather has passed is the perfect time of year for this product to be used. Apply on a dry day when no rain is forecast for 48 hours and leave to dry. Do not wash off.
Alternatively, if your patio needs a complete refresh, we would recommend Patio Black Spot Remover. This product will remove algae within 15 minutes of application. Restore the natural colour and remove any other organic growth within 2 hours.
Can I pressure wash it?
Yes, you can. However, pressure washing without a patio cleaner that does the work for you, isn’t recommended. Relying on pressure to clean your stone will cause havoc with the pointing or grout in between your patio slabs. Most concrete paving slabs are manufactured with a finish that makes them look more natural. This finish will break down over time due to weathering, but constant pressure washing will only speed up the process. Sandstone is sedimentary and can also be damaged by constant pressure washing.
Will green algae grow back?
No matter what anybody tells you, green algae will grow back! It is not possible to prevent green algae from growing on a patio. Unfortunately, despite what some sealers promise, they can’t help either! You’ll only find this out by spending time and money applying them, later discovering they’ve had no benefit.
Can I prevent green algae from growing?
Improving drainage on your patio is the most effective way to stop algae from growing. When a patio area is designed or laid, the design should ensure water runs off the patio into your garden or adequate drainage is installed. Areas the puddle over will suffer.
Conclusion
Green algae on patios is a common issue that can be easily addressed with the right cleaning products. Having an easy-to-use maintenance product on hand to treat the area whenever algae appears will reduce the amount of pressure washing required and prevent other forms of organic growth from growing. Ensuring a safe area to walk on and a patio your neighbours are jealous of!
