Stop algae from growing in gardens with one ‘essential’ task for homeowners

Green algae is a eyesore that can crop up anywhere in the .

The green gunk is known to spread everywhere from and paving to stones and sheds.

Algae thrives in wet conditions, but you can prevent it from cropping up entirely.

Helping homeowners is shed and log cabin expert Sam Jenkinson from the garden building retailer Tiger.

Mr Jenkinson has shared the one essential task he recommends do so green algae doesn’t stand a chance – managing moisture levels around your wood garden buildings.

Managing moisture is essential

He said: “Algae thrives in damp, shaded areas, and poor drainage creates the ideal breeding ground for green algae. Without proper water management, moisture builds up and the algae will flourish.”

The gardening expert explained that this is an issue for wooden structures, such as sheds and log cabins, as when algae grows on wood, it retains moisture which can then seep into the wood.

Over time, this can lead to the deterioration of a garden building’s structural integrity.

How to prevent green algae from growing on garden buildings

The trick is to reduce moisture build-up around the structure by creating better drainage and airflow which can be done in four easy steps:

1. Ensure proper drainage

Make sure the ground surrounding your garden building is sloped away from the structure.

Effective drainage allows rainwater to flow away from your garden building, rather than pooling, minimising excess moisture at the base of your shed.

2. Clear gutters regularly

Blocked gutters can lead to water overflowing and pooling near your garden building. To prevent this, clear leaves and debris from gutters regularly to ensure rainwater flows freely and is directed away from your building.

3. Maximise sunlight and airflow

Trim back bushes and branches that might block sunlight and airflow around the garden build. The more sunlight your shed gets, the quicker it will dry, discouraging algae growth and helping keep it clean.

4. Weatherproof

Lastly, consider applying a mould-resistant or weatherproof paint to your garden shed.

This helps create a barrier that can further reduce algae growth, particularly in areas where it’s more prone to moisture buildup.

What do I do if my garden building has green algae growing on it?

Despite your best prevention efforts, algae may still occasionally appear, especially in areas with excessive shade or humidity.

Mr Jenkinson has explained how to quickly tackle the problem if it does appear.

1. Create a simple cleaning solution

You can use items already in your kitchen cupboards, such as bleach and vinegar, to create an effective cleaning solution that will only set you back around 25p. Simply mix one part bleach with 10 parts water (or use a vinegar solution of equal parts vinegar and water for a gentler, eco-friendly alternative).

2. Apply the solution

Soak the algae-affected areas with your cleaning solution using a spray bottle or cloth and allow it to sit for 10 to 15 minutes.

3. Scrub the surfaces

Use a stiff-bristled brush to scrub away the algae. For stubborn patches, reapply the solution and scrub again.

4. Rinse off

After scrubbing, rinse the area with a garden hose to remove all the algae and cleaning solution.