Shovel

The Shovel, obtained at the end of level 1-4, is used to dig up plants. Before level 1-5, Wall-nut Bowling, starts, Crazy Dave will have you use the shovel to dig up 3 Peashooters planted on the lawn so Wall-nuts won't hit them. In order to replace or remove plants, you will need to dig them up with the Shovel, except for Wall-nuts, Tall-nuts, and Pumpkins after purchasing Wall-nut First Aid from Crazy Dave.

You cannot get the shoveled up plant back in any way. You will also not get the sun back, so if you want to use the shovel, make sure you want to get rid of the plant in the way. Also, only get rid of the plant if you need room for another plant.