Do you need a license to plant a garden?

Generally, you would not need a license to plant a garden.

not anywhere that I have ever heard

In some areas yes you need a licence to plant a garden.

no need a license to plant a garden

In case if you want to use the garden for business purposes,otherwise usually no need to apply a license.
Yip

its a casual matter and also a personal matter. you do noy need license to plant a garden. However you may contact to local agriculture officer about this matter,

You would generally not need a license (permission) if it's your own property and not subject to approval by others (e.g., HOA).

Some places require a landscape contractor to have a license and almost EVERY place requires a license to offer landscape architecture.

not everywhere

no

Yes