Square Shovels

There is no gardening without humility. Nature is constantly sending even its oldest scholars to the bottom of the class for some egregious blunder.

Alfred Austin

Sharpening the top edge enables the shovel's back to lie flat on the surface, getting all the material into it (e.g., mulch sitting on a concrete drive, or gravel in the bed of your truck).


A 6" smooth cut machinist’s hand file is useful to carry in your gardening tools box. Use it to resharpen the shovel as needed throughout the tool's usage for the day.

General Guidelines
α Notes
45°
If the original angle is different, it is best to match that.

Notes & Comments

Shaping the edge: New shovels I have purchased have an angle (α) of 90°. Therefore, initial shaping of the edge is to be expected.

A machinist’s hand file such as a 12-14" bastard file is often sufficient for this task.

If you use an angle grinder, consider using a 120 grit flap disc. A metal grinding wheel may be needed for large-scale shaping. In either case, be sure to not overheat the metal too much: it weakens the metal.


Sharpening the edge: Use a machinist’s hand file.

  1. Start with a 8-10" medium (or second) cut file.
  2. Finish with a 6" smooth cut file, then use this file to remove the burr.

Ongoing Maintenance

Be sure to remove all caked-on dirt. A wire brush or putty knife can be useful for this. A well-kept tool will last your lifetime, and will still be usable by your children (and maybe your grandkids).


Camellia Oil Spray Bottle

Sap can be removed using a solvent. Acetone works well, but be sure to wear protective clothing as this is not kind to your body, and be sure the area is well ventilated.

After using any solvent, be sure to apply a thin coat of camellia oil to the tool. I like the spray bottle of camellia oil sold by Tools for Working Wood.

Some advocate using boiled linseed oil (BLO), but BLO often has heavy metals or other bad chemicals added for drying agents, and these are not good for you to handle, nor would they be good for the plants on which you might use this tool.


If the tool was exposed to any diseased plants or soil which is infected with pests, give it a quick wash in diluted bleach (1 part bleach to 8 parts water), and then rinse with plain water. Be sure to dry afterwards, and apply a thin coat of camellia oil.


Tools in Storage

Gardening tools often get stored for a while after sharpening, so it is recommended to oil the sharpened surface with camellia oil. (Indeed, all unpainted surfaces would benefit from this.)

Petroleum jelly is another option.


More Information

Books & Papers


About this site
Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.