To change your location, tap your user avatar in the top left of any tab and select the pencil icon. Under Geolocation, you'll be able to update your location.
It's important that this location reflects where your plants are in the world, as light availability and water needs change drastically depending where on Earth you are!
To protect your privacy, you can allow Greg access to your location for the most accurate recommendations while hiding it from the public. To set your location to private, turn on the toggle beneath Geolocation.