Crush the oreos into a fine crumb. You can use a food processor and pulse until cookies resemble crumbs or place cookies in zip lock bag and use rolling pin to crumble.
Using a whisk and large size bowl, add pudding mix and cold mix and whisk until pudding thickens. Fold in Cool Whip. Set aside.
In separate bowl, mix together cream cheese and butter until creamy. Slowly mix in powdered sugar until well blended and smooth.
Add cream cheese mixture to pudding mix and stir to combine.
To assemble:
Place oreo crumbs in bottom of flower pot, add a layer of pudding mix, then a few worms. Repeat layering until flower pot is full. Finish with cookie crumb layer.
Place in refrigerator to chill until time to serve.
To serve: decorate with artificial flowers and serve with small "new" gardening trowel.