How to Clean Pruning Shears With Isopropyl Alcohol

A clean pair of pruning shears is an important tool for lowering the risk of carrying micro-organisms from one plant to another while making cuts. Soil, plant debris and sap can cling to the blade, so physical cleaning must be carried out before disinfection. For small pruning tools, isopropyl alcohol at 70% or above may be used where appropriate.

Why clean pruning shears before moving to another plant?

While pruning, the blade comes into direct contact with leaves, branches, sap and other plant material. If the plant has a pathogen, residue left on the tool may help transfer it during the next cut.

For this reason, simply giving the shears a quick wipe is not enough. Organic matter must be removed before disinfection, as soil and plant remnants can prevent the disinfectant from making proper contact with the tool's surface.

What is the difference between cleaning and disinfecting the tool?

Cleaning involves physically removing soil, sap and plant debris caught on the blade and moving parts. This step prepares the surface for disinfectant application and must be done first.

Disinfecting means applying a product that can reduce or eliminate certain micro-organisms on the tool. For small pruning shears, isopropyl alcohol at a concentration of 70% or higher is one of the options recommended by the University of Minnesota Extension.

How should pruning shears be cleaned properly?

First, remove any visible soil, leaves, pieces of bark and sap. Once the blade is clean, apply the selected disinfectant in line with the product instructions. When using isopropyl alcohol, the recommended concentration is 70% or above, and it should not be diluted.

After sanitising the tool, allow it to dry fully. Maintenance also helps preserve the shears, particularly if they are used regularly in the garden. Metal tools should be protected from rust with suitable products that do not pose a risk of transfer to plants.

When might alcohol not be enough?

There is an important exception for particular diseases. The University of Minnesota Extension warns that alcohol may not effectively disinfect tools used on apple trees infected with fire blight, a bacterial disease.

In these circumstances, the sanitation method must be selected according to the pathogen involved. Therefore, where disease is suspected, it is not advisable to treat every pruning situation as merely a matter of ordinary dirt. Identifying the problem helps determine a more suitable disinfection strategy.