{"id":120,"date":"2025-09-24T16:52:26","date_gmt":"2025-09-24T20:52:26","guid":{"rendered":"https:\/\/www.clarku.edu\/hadwen-arboretum\/?p=120"},"modified":"2025-09-25T17:22:47","modified_gmt":"2025-09-25T21:22:47","slug":"black-walnut","status":"publish","type":"post","link":"https:\/\/www.clarku.edu\/hadwen-arboretum\/trees\/black-walnut\/","title":{"rendered":"Black Walnut"},"content":{"rendered":"\n<div class=\"wp-block-columns sidebar is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50rem\">\n<h2 class=\"wp-block-heading\"><em><em><em>Juglans nigra<\/em><\/em><\/em><\/h2>\n\n\n\n<p class=\"is-style-intro\">Black walnut thrives in full sun. That\u2019s why you\u2019ll often find it at the edges of roads, forests, and clearings.<\/p>\n\n\n\n<aside class=\"wp-block-group boxout has-light-green-background-color has-background is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-12dd3699 wp-block-group-is-layout-constrained\">\n<h4 class=\"wp-block-heading\">Location<\/h4>\n\n\n\n<p>Today, the arboretum hosts over a dozen black walnut trees. Look out from them as you wander from the corner of May and Lovell towards the Lovell Street entrance, and then again as you\u2019re by the Magnolia Trail.<\/p>\n<\/aside>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50rem\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"846\" height=\"564\" src=\"https:\/\/www.clarku.edu\/hadwen-arboretum\/wp-content\/uploads\/sites\/97\/black-walnut-leaf-846x564-1.jpg\" alt=\"\" class=\"wp-image-122\" srcset=\"https:\/\/www.clarku.edu\/hadwen-arboretum\/wp-content\/uploads\/sites\/97\/black-walnut-leaf-846x564-1.jpg 846w, https:\/\/www.clarku.edu\/hadwen-arboretum\/wp-content\/uploads\/sites\/97\/black-walnut-leaf-846x564-1-300x200.jpg 300w, https:\/\/www.clarku.edu\/hadwen-arboretum\/wp-content\/uploads\/sites\/97\/black-walnut-leaf-846x564-1-768x512.jpg 768w\" sizes=\"auto, (max-width: 846px) 100vw, 846px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:4rem\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group alignfull section-intro has-light-warm-gray-background-color has-background is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-stretch is-layout-flow wp-block-column-is-layout-flow\">\n<div style=\"background-image:url(&apos;https:\/\/www.clarku.edu\/hadwen-arboretum\/wp-content\/uploads\/sites\/97\/black-walnut-tree.jpg&apos;);background-position:50% 50%;background-size:cover;\" class=\"wp-block-group padded lifted has-white-background-color has-background wp-container-content-69bc4bdf is-layout-constrained wp-block-group-is-layout-constrained\">\n<div style=\"height:25.625rem\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-group padded has-charcoal-color has-text-color has-link-color wp-elements-1b30fcdc0dbac24170f16970188ece26 is-layout-constrained wp-block-group-is-layout-constrained\">\n<h3 class=\"wp-block-heading\">History at Hadwen<\/h3>\n\n\n\n<p class=\"intro has-medium-font-size\">The black walnut has been documented in the aboretum since at least 1900, when Hadwen wrote there was a black walnut \u201cfrom Japan producing fruit in clusters\u201d on his property. He felt that the walnut \u201cmakes a fine vigorous tree; tall, with spreading habit; its leaves long, swaying gracefully in the breeze.\u201d<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group section is-layout-constrained wp-block-group-is-layout-constrained\"><div style=\"color:var(--clarku-color-green)\" class=\"eyebrow  has-text-align-left\">Keep learning<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Detailed species information<\/h3>\n\n\n\n<p>Black Walnut is a deciduous tree in the family Juglandaceae native to much of central and eastern North America. Black walnut typically reaches 70\u201380 feet (21\u201324 meters) in height with a dark gray, furrowed bark forming a diamond-like pattern. The dark green leaves are compound and alternately arranged on the stem. Each leaflet is 2\u20134 inches (5\u201310 centimeters) with serrated edges and fuzzy underside. The flowers of the black walnut are hanging, green catkins. In summer and fall, round, hard, green fruits emerge which contain walnuts.<\/p>\n\n\n\n<p>The black walnut is a pioneer species and can often be found in disturbed areas and edges of forests and fields. Although black walnut is considered a shade-intolerant species, it can be found in the understories of forests without the ability to produce nuts. Black walnut is a notable allelopathic tree species meaning it produces and disperses chemicals that hinder the growth of other organisms, particularly other competing plants. The nuts are a valuable source of food for many animals including squirrels, birds, and deer.<\/p>\n\n\n\n<p>The black walnut is widely cultivated for its lumber and nuts. The lumber is highly commercially valuable because of its deep-colored, straight-grained, and workable wood. The nuts are shelled after being collected from wild harvests predominantly in the state of Missouri. Because of its allelopathic characteristics and large fruits, black walnut is not typically used in landscaping but can serve as a suitable shade tree in many cases.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Juglans nigra Black walnut thrives in full sun. That\u2019s why you\u2019ll often find it at the edges of roads, forests, and clearings. Location Today, the arboretum hosts over a dozen black walnut trees. Look out from them as you wander from the corner of May and Lovell towards the Lovell Street entrance, and then again [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":122,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[5],"tags":[],"class_list":["post-120","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trees"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Black Walnut | Hadwen Arboretum | Clark University<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.clarku.edu\/hadwen-arboretum\/trees\/black-walnut\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Black Walnut\" \/>\n<meta property=\"og:description\" content=\"Juglans nigra Black walnut thrives in full sun. 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