How to remove certain nodes from the scene in SpriteKit?

Question

Swift

There is class Renderer: SKScenealso a function drawField(field: Field)that draws cubes on the stage.

override func didMove(to view: SKView) {
         drawField(field: fieldTop)
        drawField(field: fieldBottom)
        setPlayerInfo(text: "STEPS", x_position: -90, y_position: 360, verticalAlignmentMode: .top, horizontalAlignmentMode: .right)
        setPlayerInfo(text: "TIME", x_position: 100, y_position: 360, verticalAlignmentMode: .top, horizontalAlignmentMode: .left)
    }

Do I need to fieldBottomconstantly re-render (fieldBottom is a node that consists of many cubes, like in a Match 3 game) because the user moves these cubes?
I think to do it like this

override func update(_ currentTime: TimeInterval) {
        clearField()
        drawField(field: fieldBottom)
    }

But the problem is that I don't know how to make the method clearField()so that it only deletes the nodesfieldBottom