How to get rid of moss in a greenhouse – 6 things to consider

Although moss and algae won’t kill your plants directly, if left to spread, it will begin to block sunlight and thus stunt young plants from growing freely.  Therefore, the amount of moss and algae in a greenhouse should be kept to a minimum.  Moss and algae will not remove nutrients from your greenhouse plants though.

Although not a problem, moss and algae is unsightly and will detract from the overall neat and tidy look of your greenhouse.

Moss and algae are an indicator that poor water practices are in operation in the greenhouse.  Moss will grow on continuously wet surfaces.  It can also be an indicator of poor ventilation within the greenhouse.

How do you stop moss from growing in a greenhouse?

As moss growth in a greenhouse is an indicator of poor ventilation or excessive moisture, finding ways to improve these conditions will vastly reduce the chance of moss or algae buildup.

There are many ways to improve ventilation within a greenhouse.  These are:

  1. Open the greenhouse window as often as possible.
  2. Install an auto-vent.
  3. Space plants out so that they aren’t crammed together.
  4. Don’t allow the foliage of a plant to touch the greenhouse glass or polycarbonate sheeting.

Excessive moisture can be caused by overwatering your plants and allowing pools of water to build up.

How do you remove moss from a glass greenhouse roof?

Removing moss and algae is a straightforward process.  This can be achieved with a combination of approaches.  The first being hard work and scrubbing the moss and algae off the surface.  Secondly, using a chemical product to perform a deep clean of the surface to prevent the moss and algae from reappearing.

The recommended steps are:

  1. Fill a bucket with warm, soapy water.
  2. Add the correct measure of an algaecide to prevent the moss and algae from recurring.  Find the latest prices from Amazon here (US), here (UK).
  3. Dip a soft brush, sponge or alternatively, for tall greenhouses, a telescopic pole with sponge attachment into the soapy water.  
  4. Scrub the glass panels until the moss and algae has been removed.
  5. If available, use a pressure washer on it’s softest mode to remove the hard to remove mossy residue from the glass surface.  Ensure that the pressure washer hose doesn’t get any closer than 6” from the glass surface so that it doesn’t crack.
  6. Allow the glass to air dry.

How do you remove moss from a polycarbonate roof?

Removing moss and algae is a straightforward process.  This can be achieved with a combination of approaches.  The first being hard work and scrubbing the moss and algae off the surface.  Secondly, using a chemical product to perform a deep clean of the surface to prevent the moss and algae from reappearing.

The recommended steps are:

  1. Fill a bucket with warm, soapy water.
  2. Add the correct measure of an algaecide to prevent the moss and algae from recurring.  Find the latest prices from Amazon here (US), here (UK).
  3. Dip a soft brush, sponge or alternatively, for a tall greenhouses, a telescopic pole with sponge attachment into the soapy water.  
  4. Scrub the polycarbonate panels until the moss and algae has been removed.
  5. If available, use a pressure washer on it’s softest mode to remove the hard to remove mossy residue from the polycarbonate surface.  Ensure that the pressure washer hose doesn’t get any closer than 6” from the polycarbonate surface so that it doesn’t crack.
  6. Allow the surface to air dry.

How to remove moss from between the glass and the greenhouse frame

The best way to remove moss and algae from between glass panes of a greenhouse is to wedge the glass ever so slightly apart with a thin plastic object and to use a pressure washer hose to clean out the moss between the gaps.

  1. Cleaning between greenhouse panes can be very difficult as they are often tightly pressed together and the use of excessive force will crack or shatter the glass.  Wedging the glass apart with a plastic garden/plant label will likely work well.

Follow these steps below:

  1. Wedge the plastic garden/plant label between each pane of glass.
  2. use a pressure washer on it’s softest mode to remove the hard to remove mossy residue from the glass surface.  Ensure that the pressure washer hose doesn’t get any closer than 6” from the polycarbonate surface so that it doesn’t crack.
  3. Apply an algaecide between the glass panes while they are apart in order to prevent the growth of moss or algae during the course of the next year.  Find the latest prices from Amazon here (US), here (UK).

How do you make homemade moss killer?

Although there are many off the shelf moss-killer products, it is possible to create your own homemade versions that can work just as effectively.  All you will need is a bucket, water, soap, salt and vinegar.

Of course, you can always scrape off the moss from the greenhouse surface however even after doing so, the small roots of the moss can quite often be left behind.  That’s why using an additional measure will help kill the rest of the moss and prevent it from coming back in a hurry.

The recipe for this solution is as follows:

  1. Take 1 gallon of water and add it to your bucket. 
  2. Add in 1 pound of salt and 1 tablespoon of vinegar. 
  3. Add the soap however ensure that it doesn’t make up any more than 1/5 of the total mixture. 
  4. Apply the mixture with a sponge and rub to remove the moss.
  5. Once removed, apply a further measure of the mixture to the glass or polycarbonate and allow it to dwell and dry.  The vinegar and salt will draw out the moisture from the remaining moss and kill it.  The soap will allow the salt and vinegar to stick to the moss.

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