If you notice a foamy like substance on grass in parks in St. Catharines don't worry it's completely safe.
The city is currently testing a new, all natural system to control weeds.
The foam is safe, biodegradable and doesn't include any herbicides, pesticides or other chemicals.
In a release, the city says the weed control is made from a mix of plant oils, maize, wheat and potatoes.
Spraying is already underway and will continue until the end of this week.