# Roots and owners Every memo and effect belongs to an owner. Disposing that owner runs its cleanups and disposes its children. Disposing it again is safe. The owner can be the graph's `Root`, a scope created by `createRoot`, or the current run of an enclosing effect, owning memo or boundary. ## Create a scope - `createRoot body` creates a scope, runs `body` with its `Owner`, and returns `body`'s result. - `owner.Dispose ()` disposes everything created inside that scope. - `graph.Dispose ()` disposes every node the graph owns. Use `use graph = new Graph ()` to dispose the graph automatically when the enclosing scope ends. In this replay, disposing the root removes its effect's dependency. The signal remains available, but later writes no longer run that effect.
## Disposal :::details Disposal order and nested roots An owner runs its cleanups first, then disposes its children. Each group runs in reverse creation order. A root created inside an effect belongs to that effect's current run. It is disposed before the effect's next run. ::: :::warning Leaving a root or graph undisposed A memo retains its source dependencies, and an effect keeps responding to changes, until its owner is disposed. Dispose each `createRoot` owner when its work ends. Dispose the graph with `use graph = new Graph ()` or `graph.Dispose ()`. ::: Register subscriptions and other resources with [Cleanup](cleanup.md).