Frequently asked questions

Here are some popular questions we often receive about the Robotic Lawnmower. If you can’t find your answer here, give our customer service a call at 1 300 804 213.

How do I know if the Robotic Lawnmower is suitable for my garden?

Simply check if your garden is suitable using the product specifications such as size, width of passageways and inclinations.

Lawn area size: Maximum 250 m² +/- 20%
Inclination inside the working area: Maximum 25% (14°)
Narrow passage: Minimum 60 cm (from wall to wall)

For more information, see operating instructions or visit the "Products" section of this Website.

Will I need to buy the parts required for the installation separately?

The GARDENA SILENO City 250 comes with 150 metres of loop wire, 200 pegs, 5 connectors and 4 couplers. This installations start-up kit will suffice to set-up an area measuring up to 250 m².

What is the difference between the boundary wire and the guide wire?

The actual wire used for the boundary and guide wire is the same. 150 metres of it is included with your Robotic Lawnmower purchase. The boundary wire refers to the length of wire that surrounds the mowing area and confines the Robotic Lawnmower within it.

The guide wire is the length of wire that the Robotic Lawnmower seeks and follows when its battery charge is starting to get low. It is connected to the boundary wire and leads the Robotic Lawnmower to the charging station.

Can I use a GARDENA Robotic Lawnmower in two separate areas?

If the work area consists of two areas between which the Robotic Lawnmower cannot move freely, it is advisable to create a secondary area by laying an independent boundary wire. In this application, the Robotic Lawnmower is carried by hand between the main area and the secondary area. Using the operating mode MAN / secondary area, the Robotic Lawnmower then mows the secondary area until the charge runs out. The Robotic Lawnmower is then carried back to the charging station in the main area for charging.

You will find more information on secondary areas on page 16 of the owner’s manual.

Does the charging station have to be placed on the lawn or could it be placed in a garden bed?

The area in front of the charging station is a high-traffic location. The Robotic Lawnmower should be able to start in any directions and return to the charging station from any direction.

For further information, see section "How to install the charging station for the GARDENA Robotic Lawnmower" in the operating instructions.

I have a narrow passage in my garden; will it be a problem for the Robotic Lawnmower?

The narrowest possible passage that the Robotic Lawnmower can manage is 60 centimetres in width (from wall-to-wall). It is better though to avoid long narrow passages and areas narrower than 1.5 metres since there is a risk that the Robotic Lawnmower will travel around in the passage for a period of time making the lawn look flattened.

Why should I register my Robotic Lawnmower?

If you register your Robotic Lawnmower within 3 months of purchase, the warranty will be extended by an extra year therefore covering your purchase for 3 years in total (wear parts and battery excluded).

You can also obtain a recovery PIN code from GARDENA Customer Service once a security check verifying that you are the registered owner of the specific product has been performed.
For more information on other great benefits, visit the registration page.

At what level should I set my mowing levels once installation is complete?

Mowing the grass too low right after the installation can damage the wire insulation. Damage to the insulation may not cause disruptions until several weeks or months later. To avoid this, always select the maximum cutting height during the first weeks after installation and then lower the height one step at a time every second week until the desired cutting height has been reached.

How do I find a break in the wire?

Breaks in the loop wire are usually the result of unintentional physical damage to the wire such as when gardening with a shovel or due to the wire being stretched excessively during installation. It can also be caused by mowing too low right after installation.

It is easy to fix the break once found. The damaged section must simply be replaced with a new wire and connected using original GARDENA couplers. To find the break when the wire is buried, simply follow the comprehensive step-by-step instructions on page 47 of the owner’s manual. Remember to make sure that ECO mode is turned off.

How often do I need to replace the blades?

The blades must be kept in good condition in order to obtain the best mowing results. Although keeping your lawn free of stones, branches and other objects will keep the blades sharp longer, they will need to be changed approximately every 6-12 months depending on usage. When changing blades, it is important to only use GARDENA blades and screws and in order to maintain balance, all three blades must be changed at once.

How much grass does the GARDENA Robotic Lawnmower leave standing at the edge?

The width of the uncut grass strip depends on how close the boundary wire can be laid to the edge of the lawn.
  • e.g. at 5 cm (R38Li, R40 Li, R45Li, R50Li and R70Li) or 10 cm ((smart) SILENO / SILENO+) from the lawn edge, along brick paths that can be passed by the Robotic Lawnmower, there will be no uncut grass strip.
  • e.g. at 20 cm (R38Li, R40 Li, R45Li, R50Li and R70Li) or 25 cm ((smart) SILENO / SILENO+) from the lawn edge, along beds or crushed rock that cannot be driven by the Robotic Lawnmower, there will be a narrow strip of grass.
  • e.g. at 30 cm (R38Li, R40 Li, R45Li, R50Li and R70Li) or 35 cm ((smart) SILENO / SILENO+) from the lawn edge, along a wall or around trees, there will be a slightly wider strip of grass.
To make sure that the grass is completely mowed or that only small strips of uncut grass are left, change the layout of your garden, for example by edging the lawn with curb stones or concrete slabs at lawn height.