clear data on treeview

Hello,

I have a treeview that I Attach data to it like

type
TNodeData = class
....


var
Data: TNodeData;
TNode: TTreeNode;

TNode := Tree.Items.Add(nil, 'text');
Data := TNodeData.Create;
Data.x1 := 125;


Do I have to clear that node data on program close? Is Tree.Items.Clear
enough ?

Thanks


.