diff --git a/packages/block-library/src/preformatted/index.js b/packages/block-library/src/preformatted/index.js
index 18abd542f1460..35f0b9bf21227 100644
--- a/packages/block-library/src/preformatted/index.js
+++ b/packages/block-library/src/preformatted/index.js
@@ -2,7 +2,7 @@
  * WordPress
  */
 import { __ } from '@wordpress/i18n';
-import { createBlock, getPhrasingContentSchema } from '@wordpress/blocks';
+import { children, createBlock, getPhrasingContentSchema } from '@wordpress/blocks';
 import { RichText } from '@wordpress/editor';
 
 export const name = 'core/preformatted';
@@ -58,7 +58,7 @@ export const settings = {
 		],
 	},
 
-	edit( { attributes, setAttributes, className } ) {
+	edit( { attributes, mergeBlocks, setAttributes, className } ) {
 		const { content } = attributes;
 
 		return (
@@ -72,6 +72,7 @@ export const settings = {
 				} }
 				placeholder={ __( 'Write preformatted text…' ) }
 				wrapperClassName={ className }
+				onMerge={ mergeBlocks }
 			/>
 		);
 	},
@@ -81,4 +82,10 @@ export const settings = {
 
 		return <RichText.Content tagName="pre" value={ content } />;
 	},
+
+	merge( attributes, attributesToMerge ) {
+		return {
+			content: children.concat( attributes.content, attributesToMerge.content ),
+		};
+	},
 };
diff --git a/packages/block-library/src/quote/index.js b/packages/block-library/src/quote/index.js
index 0da556e69fa65..b41a320ba1db2 100644
--- a/packages/block-library/src/quote/index.js
+++ b/packages/block-library/src/quote/index.js
@@ -8,7 +8,7 @@ import { castArray, get, isString, isEmpty, omit } from 'lodash';
  */
 import { __ } from '@wordpress/i18n';
 import { Fragment } from '@wordpress/element';
-import { createBlock, getPhrasingContentSchema } from '@wordpress/blocks';
+import { children, createBlock, getPhrasingContentSchema } from '@wordpress/blocks';
 import {
 	BlockControls,
 	AlignmentToolbar,
@@ -233,6 +233,14 @@ export const settings = {
 		);
 	},
 
+	merge( attributes, attributesToMerge ) {
+		return {
+			...attributes,
+			value: attributes.value.concat( attributesToMerge.value ),
+			citation: children.concat( attributes.citation, attributesToMerge.citation ),
+		};
+	},
+
 	deprecated: [
 		{
 			attributes: {
diff --git a/packages/block-library/src/verse/index.js b/packages/block-library/src/verse/index.js
index 2ac312c7a77f6..c57a4e620d283 100644
--- a/packages/block-library/src/verse/index.js
+++ b/packages/block-library/src/verse/index.js
@@ -3,7 +3,7 @@
  */
 import { __ } from '@wordpress/i18n';
 import { Fragment } from '@wordpress/element';
-import { createBlock } from '@wordpress/blocks';
+import { children, createBlock } from '@wordpress/blocks';
 import {
 	RichText,
 	BlockControls,
@@ -53,7 +53,7 @@ export const settings = {
 		],
 	},
 
-	edit( { attributes, setAttributes, className } ) {
+	edit( { attributes, setAttributes, className, mergeBlocks } ) {
 		const { textAlign, content } = attributes;
 
 		return (
@@ -77,6 +77,7 @@ export const settings = {
 					style={ { textAlign: textAlign } }
 					placeholder={ __( 'Write…' ) }
 					wrapperClassName={ className }
+					onMerge={ mergeBlocks }
 				/>
 			</Fragment>
 		);
@@ -94,4 +95,10 @@ export const settings = {
 			/>
 		);
 	},
+
+	merge( attributes, attributesToMerge ) {
+		return {
+			content: children.concat( attributes.content, attributesToMerge.content ),
+		};
+	},
 };