FAQs

Shipping policy

If the product is in stock, we ship it out within 24 hours of receiving it via our fulfillment partner Amazon. The robot might arrive in Amazon-branded packaging.

We ship to the U.S.

When your order arrives depends on the shipping method chosen at checkout. Standard free shipping takes 3-7 days, Expedited shipping takes 2-3 days, and Priority is usually next day - depending on when you ordered it and where you live.

Returns and exchanges

Tertill comes with a 60-day No-Risk return policy and a full 1-year limited warranty

Contact support@tertill.com for all returns and warranty issues. You will receive a shipping label and instructions on how to ship the robot back to us.

How Does Tertill Work?

Tertill is a completely new way to manage weeds in home gardens.


Tertill has forward-facing sensors that detect plants. When they sense a plant, Tertill turns away. Plants too short to reach Tertill’s edges are assumed to be weeds. You can still keep short plants safe by placing provided plant guards around them until they are tall enough for Tertill to recognize. When Tertill approaches the guide, it will sense it and turn away.


Tertill has two mechanisms for keeping weeds out of your garden. First, by continuously roaming over the soil, it prevents many weeds from germinating. If there are weeds that manage to grow, it whacks these weeds using a spinning string trimmer. A whacked weed may sprout again, but sprouting takes energy stored in the seed or root. By coming back every day, Tertill never lets a weed develop the leaves it needs to replenish this energy, so eventually, the weed gives up and dies.


There needs to be at least a 4-inch barrier around your garden to keep Tertill from wandering away. The barrier might be a fence, edging, or the wooden border of a raised bed. Tertill has a simple, reliable strategy to ensure that it covers the garden, using algorithms similar to Roomba and other robotic vacuums.

Owning a Tertill

What it is like to have Tertill in your garden


Tertill is able to maintain up to a ten by twenty-foot garden by carefully managing how it uses the power it collects from the sun. A key to this is Tertill’s ability to run for small amounts of time throughout the day. Over the course of a day, the total run time will be between one to two hours depending on the amount of sunlight available. More details are available on our support site.


No, Tertill gets all its needed power from the sun. When there is sunlight—even on cloudy days—Tertill’s solar cell converts the light into electricity. The robot stores the energy in a battery. You don’t need to charge Tertill’s battery. Tertill uses its stored power smartly—during cloudy stretches, when less power is available, it patrols for weeds less often. Tertill is more aggressive during periods with more sun. Fortunately, weeds grow more slowly when they have less light.


Tertill’s four-wheel-drive and round body design minimizes the chance of it getting stuck, but it can happen. It is important to check on Tertill every few days, especially when you first set up your garden or after severe weather or watering. Should Tertill ever get stuck simply eliminate the obstacle and place it back down to allow it to continue to patrol for weeds.

Tertill will keep the places it can reach weed free. There might be weeds where Tertill can't reach such as along the edges and in places too densely packed with plants.

No, Tertill is designed to stay in your garden all season long. As a general rule, if your plants can take it - so can Tertill. If your garden is prone to flooding, you should move Tertill to higher ground.

Tertill was designed to be pretty self-sufficient. The only maintenance is to check the whacker string. It should be replaced when it wears down to less than an inch (about the length of your thumbnail). Watch a video on how to replace the whacker string.

Where Tertill works

Tertill is not suitable for all applications. Find out if it will work for yours!

No, Tertill is not designed to cut or remove weeds from grass.

Tertill can work in flower gardens that have at least a 4-inch barrier all the way around the perimeter, plant spacing of 9-12 inches, and a relatively flat, relatively smooth surface.

Yes, Tertill works on most kinds of mulches. It is NOT recommended for gardens with straw mulch or big chunky bark mulch.

Tertill works in gardens with up to a 6 degree general slope. It has sensors that will make it turn away from an isolated 22 degree slope (such as a mound for zucchini) to avoid flipping over.

Tertill is not designed to work on rocks. We have tested it on pea gravel, and it keeps weeds from growing tall, but they can still grow in the gaps between the rocks.

Tertill's main strategy is to prevent weeds from ever growing, that is why it needs to be placed in a weed-free area to start. Weeds with extensive or established roots such as grass, oak saplings, and nutsedge need to be completely removed (roots and all) prior to setting Tertill in the garden.