diff --git a/lib/customizer.php b/lib/customizer.php
index cb221987ae97c4..154b08c5429893 100644
--- a/lib/customizer.php
+++ b/lib/customizer.php
@@ -55,10 +55,12 @@ function gutenberg_customize_register( $wp_customize ) {
 			'sanitize_callback' => 'gutenberg_customize_sanitize',
 		)
 	);
-	$wp_customize->add_section(
-		'gutenberg_widget_blocks',
-		array( 'title' => __( 'Widget Blocks (Experimental)', 'gutenberg' ) )
-	);
+	if ( get_option( 'gutenberg-experiments' ) && array_key_exists( 'gutenberg-widget-experiments', get_option( 'gutenberg-experiments' ) ) ) {
+		$wp_customize->add_section(
+			'gutenberg_widget_blocks',
+			array( 'title' => __( 'Widget Blocks (Experimental)', 'gutenberg' ) )
+		);
+	}
 	$wp_customize->add_control(
 		new WP_Customize_Widget_Blocks_Control(
 			$wp_customize,
diff --git a/lib/widgets-page.php b/lib/widgets-page.php
index 6e5263f267522c..eb637d4ba01b2e 100644
--- a/lib/widgets-page.php
+++ b/lib/widgets-page.php
@@ -69,12 +69,16 @@ function gutenberg_widgets_init( $hook ) {
 		);
 	}
 
+	$experiments_exist        = get_option( 'gutenberg-experiments' );
+	$legacy_widget_experiment = $experiments_exist ? array_key_exists( 'gutenberg-widget-experiments', get_option( 'gutenberg-experiments' ) ) : false;
+
 	$settings = array_merge(
 		array(
-			'disableCustomColors'    => get_theme_support( 'disable-custom-colors' ),
-			'disableCustomFontSizes' => get_theme_support( 'disable-custom-font-sizes' ),
-			'imageSizes'             => $available_image_sizes,
-			'maxUploadFileSize'      => $max_upload_size,
+			'disableCustomColors'                   => get_theme_support( 'disable-custom-colors' ),
+			'disableCustomFontSizes'                => get_theme_support( 'disable-custom-font-sizes' ),
+			'imageSizes'                            => $available_image_sizes,
+			'maxUploadFileSize'                     => $max_upload_size,
+			'__experimentalEnableLegacyWidgetBlock' => $legacy_widget_experiment,
 		),
 		gutenberg_get_legacy_widget_settings()
 	);
diff --git a/packages/edit-widgets/src/index.js b/packages/edit-widgets/src/index.js
index 7efa0d6c5a4dd2..1a7a610fc55ea2 100644
--- a/packages/edit-widgets/src/index.js
+++ b/packages/edit-widgets/src/index.js
@@ -40,6 +40,9 @@ export function initialize( id, settings ) {
  */
 export function customizerInitialize( id, settings ) {
 	registerCoreBlocks();
+	if ( process.env.GUTENBERG_PHASE === 2 ) {
+		__experimentalRegisterExperimentalCoreBlocks( settings );
+	}
 	render(
 		<CustomizerEditWidgetsInitializer
 			settings={ settings }