August 26, 2026

How to grow cat grass indoors

Cat Care
A silver tabby cat with green eyes lounges on a windowsill, looking toward the camera with a blurred view of green trees outside the window.

Looking for some indoor activities you can do with your family? Why not take up growing cat grass for your cats, or to donate to our animal centres! 

Planting 

To grow the cat grass indoors, fill the pot with soil just about two inches from the top, then scatter some seeds on top of the soil and put a thin layer of soil (about ¼ inch) over top. 

Germination and growing cat grass 

Take a spray bottle, or gently use your hands, and moisten the soil with water. Remember to do this gently or the seeds will be dispersed. Once the soil is evenly moist, cover the container with plastic wrap – add perforations for air flow. Set the container aside in a cool and dark place to help the seeds germinate 

In two to three days, you’ll be able to see the tiny sprouts emerging. Remove the plastic wrap and ensure the soil is moist. Place the pot where your germinating sprouts can receive some sun and indirect light – a windowsill is perfect. 

Continue to wait until about 10 to 12 days, until the grass gets to three to five inches high. 

Additional tips: 

Before sprouting, keep the seeds evenly moist but don’t soak them. After sprouting, reduce watering to keep the soil slightly moist only. 

Keeping it in a naturally well-lit place will make it grow well with regular watering. You can also use grow lights. 

Don’t overwater! 

As soon as the grass begins to turn colour or wilt, start planting again. 

If this information was helpful, please help us continue to educate about pet health and well-being by making a donation. As a registered charity that does not receive annual government funding, the Ontario SPCA and Humane Society depends on the generosity of donors to change the lives of animals in need.