Need Another SmurfBy
This message can come up when you want to plant a new crop field or flower garden or shrub. It means you have not enough Smurfs to build the item.
The number of Smurfs living in your village equals the number of flower gardens + crop fields + shrubs (little trees that grow fruits) that you can have in the village. This does not mean the number of available Smurfs (i. e. Smurfs that are not working at the moment) but the total number of Smurfs.
To increase the number, build a house, upgrade a house or buy a Smurf from the Smurfberry Shop.