How to Grow More with Greenhouse Maintenance

9 min read

greenhouse maintenance advice

As Autumn approaches, many gardeners are putting their tools and gloves away in preparation for the long wait until spring. However, greenhouse owners are continuing to diligently tend to their plants in expectation of the harvest still to come.

Owning a greenhouse presents benefits that would put a smile on any gardener’s face, the biggest of which are:

An extended growth periodPest and disease controlHumidity, airflow, and temperature

General cleaning

greenhouse maintenance tips

As with all things in life, the amount of effort you put into starting and maintaining a project will directly affect the results. Greenhouses are not self-maintaining environments so, in order to keep plants healthy and achieve the best results possible, you will need to expend some effort to keep your greenhouse in top condition.

When to clean

Generally, the best time to clean your greenhouse is during winter or at the start of spring, but choosing the right time to clean also depends on what you are growing. If you focus on growing summer plants, such as peppers, then clean in the winter. But, if you grow more specialised plants throughout the year, then the best time to clean is in the middle of autumn.

Regardless of what you choose to grow and when to clean, aim for a dry day with a breeze. This allows you to open up all of the windows, doors, and vents so that the greenhouse is properly aired and dried shortly after being cleaned.

Outside of the greenhouse

  • Remove any debris from the area around your greenhouse and sweep away any fallen leaves or built up dirt.
  • Wash the outside with warm water and a sponge. To clean the roof of your greenhouse, use a mop or a sponge with an arm which can be extended. If you don’t have one, attach your sponge to a broom handle or bamboo cane. Do not lean on any part of the greenhouse roof! The frame and glass are not designed to support your body weight and any injuries sustained from breaking a pane of glass, the frame, or falling are likely to be serious.
  • Clean beneath the window panel joints with a hose to remove any hidden dirt.
  • Look for any broken or cracked glass panes, as well as for any signs of damage to the frame, and repair any damage found to ensure that your greenhouse is providing the best possible environment for its plant inhabitants.
  • If you have a wooden framed greenhouse, inspect the frame and apply a wood preservative to any areas which need to be touched up. This will help keep the frame protected from rot for longer.

Inside the greenhouse

Now that the outside is all sparkly and clean, it is time to step into your greenhouse. This part is a little more involved, so have a cup of tea or coffee and a small break before starting.

  • If you have any electrics in your greenhouse, switch them all off and disconnect them from the mains, if possible.
  • Organise all of the empty plant pots and grow bags into ones you will keep and ones you will throw away.
  • Remove the equipment you will keep, all plants (wherever possible), and all shelving units. If it is winter, move any sensitive plants to a shed, a conservatory, or someplace sheltered.
  • Dispose of the pots and bags you don’t need anymore.
  • Use a broom to brush the interior walls and ceiling to remove dirt and cobwebs.
  • Follow this by sweeping the floor of your greenhouse to remove fallen leaves, dirt, spilt soil and any other debris that has accumulated.
  • Clean every surface on the inside of your greenhouse with warm water, a disinfectant, such as hydrogen peroxide, and a sponge.
  • Inspect all windows and vents to ensure they work correctly. If they are difficult to open, put some oil or commercial lubricant on the joints and hinges so that you can keep your greenhouse well ventilated.
  • Wash all shelving units with warm water and disinfectant before moving them back inside.
  • Disinfect all empty plant pots and containers.
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Pest control tips

garden pests

The bane of every gardener is plant-destroying pests. They can strike at almost any part of your garden and will do an extreme amount of damage if left unchecked. Be extra prepared by checking out our garden pest control articles here:

Ant Killer Tactics – How to Get Rid of Ants in the Garden

As greenhouses are somewhat isolated from the rest of the garden, it is much more difficult for pests to establish a foothold on the plants from within. But that doesn’t mean that this is impossible, since garden pests are persistent in their quest to eat your plants. There are, however, a few steps you can take to keep your greenhouse a pest-free area.

Control what enters your greenhouseThe enemy of my enemy is my friendKeep your greenhouse cleanStay vigilant

Humidity Maintenance

humidity maintenance 

Source: Shutterstock / By Venera Salman

The humidity level in greenhouses is often much higher than that on the outside, which is beneficial to many plants. However, if the humidity level is neglected, it can cause the air inside to become either too humid or too dry. To maintain a decent level of humidity and keep plants healthy, check out the following tips.

  • If you feel that the humidity is too low, place a tray or a small bucket of water on the floor of your greenhouse during the day. The evaporating water will help raise the humidity level.
  • During hot summer days, it is best to keep the humidity in your greenhouse to a minimum. Open the vents and windows during the day to make sure that there is a constant flow of incoming cold air and expelled warm air.
  • Watering plants with cold water during the summer can cause the roots to enter a state of shock, which will reduce their effectiveness at absorbing moisture and nutrients. Avoid this by keeping a full watering can in your greenhouse throughout the summer. This way, the water will be kept at a similar temperature as its surroundings.
  • You can collect a lot of water from the roof of your greenhouse. Install some simple gutters leading to a water barrel for a free, natural supply of water for your plants.
  • Any hoses used for watering should be checked for cracks, holes, or blockages routinely. Remove any attachments and run water through the hose at its maximum capacity. This will dislodge any blockages and show you if there are any holes in the hose.

Ventilation System

It is well established that plants breathe and their growth will suffer if they are kept in a stale, unmoving air. This is why it is important to make sure that your greenhouse has adequate ventilation if you want your plants to be healthy.

  • Make sure there are enough air vents. Every major greenhouse manufacturer can tell you the recommended number of air vents your greenhouse should have.
  • Install louvres. These are another type of air vent found at the base of greenhouses. They draw in cool air to maintain a constant air flow.

So, there we have it, your guide to keeping a greenhouse in top condition. As a greenhouse owner, you will need to keep it clean, well ventilated, and perform daily checks for structural damage and pest activity in order to provide the best growing conditions that your greenhouse has to offer.


Did we miss anything? Do you have any greenhouse maintenance tips? Let us know in the comments below or give us a shout on social media!

or call us on: 020 3404 2272

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