The shape is 11.5 inches long. The width varies all the way through the pot. The bottom of the pot is 3 3/8 and the top is 4 1/2 inches.
For the inside of the card, the flower pot has to be slightly smaller than the card. Here I made it 1/8-2/8 less in size so it can fit in the card.
To create the flower base, take the smaller shape and tape it to the inside pot. Adhere your flowers to the attached smaller shape.