{"id":3727,"date":"2017-04-20T17:37:14","date_gmt":"2017-04-20T21:37:14","guid":{"rendered":"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/?p=3727"},"modified":"2017-04-20T17:45:22","modified_gmt":"2017-04-20T21:45:22","slug":"sour-mulch-can-burn-tender-plants-2","status":"publish","type":"post","link":"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/","title":{"rendered":"Sour mulch can burn tender plants"},"content":{"rendered":"<hr \/>\n<div id=\"attachment_3732\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700.jpg\" data-rel=\"lightbox-gallery-0\" data-rl_title=\"Cleome plants recovering from sour mulch injury Photo credits: Rosie Lerner\/Purdue Extension\" data-rl_caption=\"\" title=\"Cleome plants recovering from sour mulch injury Photo credits: Rosie Lerner\/Purdue Extension\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3732\" class=\"size-medium wp-image-3732\" src=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700-300x199.jpg\" alt=\"Cleome plants recovering from sour mulch injury in a landscape setting\" width=\"300\" height=\"199\" srcset=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700-300x199.jpg 300w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700-353x235.jpg 353w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700-31x21.jpg 31w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700.jpg 722w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-3732\" class=\"wp-caption-text\">Cleome plants recovering from sour mulch injury<br \/>Photo credits: Rosie Lerner\/Purdue Extension<\/p><\/div>\n<p>Although the benefits of mulching garden plants are many, wood mulch that has been improperly stockpiled can lead to plant injury or even death. Young herbaceous plants are the most susceptible to such injury, which becomes obvious shortly after applying a hardwood bark mulch. Plants may look like they have been burned with fertilizer or pesticides, or possibly, are under severe water stress. All of the above could potentially be a problem, but apparently, we must now add &#8220;sour mulch&#8221; to the list of suspects.<\/p>\n<div id=\"attachment_3733\" style=\"width: 310px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Hardwood_mulch700.jpg\" data-rel=\"lightbox-gallery-0\" data-rl_title=\"Hardwood bark mulch can turn sour\" data-rl_caption=\"\" title=\"Hardwood bark mulch can turn sour\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3733\" class=\"size-medium wp-image-3733\" src=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Hardwood_mulch700-300x199.jpg\" alt=\"A large pile of hardwood bark mulch \" width=\"300\" height=\"199\" srcset=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Hardwood_mulch700-300x199.jpg 300w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Hardwood_mulch700-353x235.jpg 353w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Hardwood_mulch700-31x21.jpg 31w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Hardwood_mulch700.jpg 722w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-3733\" class=\"wp-caption-text\">Hardwood bark mulch can turn sour<\/p><\/div>\n<p>When hardwood bark mulch is stacked in tall piles and allowed to stand for long periods, the material in the center of the pile begins to compost anaerobically (without air) and may sour. The term &#8220;sour&#8221; refers to the extreme acidity that occurs under such conditions (reported to be pH of 1.8-3.6, while that of &#8220;normal&#8221; mulch is generally close to 7.0). Some reports indicate that pine bark does not sour.<\/p>\n<p>The mulch tends to heat as it breaks down, and steam may be seen escaping from the pile when it is finally disturbed. This heat can directly injure plants, if the mulch is not allowed to cool first. However, the more serious problem is that anaerobic composting of hardwood leads to the production of several plant-damaging components; methane, alcohol, ammonia and hydrogen sulfide are possibilities.<\/p>\n<div id=\"attachment_3734\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Monkey_flower700.jpg\" data-rel=\"lightbox-gallery-0\" data-rl_title=\"Torenia (Wishbone flower) plant injured by sour mulch\" data-rl_caption=\"\" title=\"Torenia (Wishbone flower) plant injured by sour mulch\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3734\" class=\"size-medium wp-image-3734\" src=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Monkey_flower700-300x199.jpg\" alt=\"Picture of a Torenia (Wishbone flower) plant showing injury by sour mulch\" width=\"300\" height=\"199\" srcset=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Monkey_flower700-300x199.jpg 300w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Monkey_flower700-353x235.jpg 353w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Monkey_flower700-31x21.jpg 31w, https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Monkey_flower700.jpg 722w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-3734\" class=\"wp-caption-text\">Torenia (Wishbone flower) plant injured by sour mulch<\/p><\/div>\n<p>Injury to young, tender plants is swift, usually within one day of applying mulch. Symptoms include yellowing or blackening of foliage and leaf drop. Depending on the extent of the injury, plants often are able to recover. Thorough watering, especially during hot, dry weather, will help prevent further stress. Do not apply fertilizer to plants injured by sour mulch; such materials can cause further injury. However, if plants recover yet seem to be lacking in vigor, a side dressing of nitrogen may be helpful in mid-summer if weather conditions warrant. Avoid fertilizing during hot, dry weather.<\/p>\n<p>The best course of action is to prevent sour mulch injury in the first place. Stockpiles should be no higher than 4 feet, if possible; if it\u2019s necessary to stack taller, turn them periodically to allow some aeration. Alternatively, sour mulch can be made fit for use by spreading in shallow layers and allowing it to air out for a few days, preferably a week, before using around young, tender plants. If no rainfall has occurred, watering the mulch also may help wash away toxic accumulations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Although the benefits of mulching garden plants are many, wood mulch that has been improperly stockpiled can lead to plant injury or even death. Young herbaceous plants are the most susceptible to such injury, which becomes obvious shortly after applying a hardwood bark mulch. Plants may look like they have been burned with fertilizer or pesticides, or possibly, are under severe water stress. All of the above could potentially be a problem, but apparently, we&#8230;<span id=\"post-label-3727\" class=\"sr-only\">Read more about Sour mulch can burn tender plants<\/span><a class=\"read-more\" href=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/\" aria-labelledby=\"post-label-3727\">[Read More]<\/a><\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[15,21,23],"tags":[],"coauthors":[46],"class_list":["post-3727","post","type-post","status-publish","format-standard","hentry","category-gardening","category-seasonal-information","category-spring","publication-spring-gardening-stories","publication-yard-and-garden-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sour mulch can burn tender plants - Indiana Yard and Garden - Purdue Consumer Horticulture<\/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.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sour mulch can burn tender plants - Indiana Yard and Garden - Purdue Consumer Horticulture\" \/>\n<meta property=\"og:description\" content=\"Although the benefits of mulching garden plants are many, wood mulch that has been improperly stockpiled can lead to plant injury or even death. Young herbaceous plants are the most susceptible to such injury, which becomes obvious shortly after applying a hardwood bark mulch. Plants may look like they have been burned with fertilizer or pesticides, or possibly, are under severe water stress. All of the above could potentially be a problem, but apparently, we...Read more about Sour mulch can burn tender plants[Read More]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Indiana Yard and Garden - Purdue Consumer Horticulture\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Purdue-Home-Hort-716960998353855\/\" \/>\n<meta property=\"article:published_time\" content=\"2017-04-20T21:37:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-04-20T21:45:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700-300x199.jpg\" \/>\n<meta name=\"author\" content=\"Rosie Lerner\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@PurdueHomeHort\" \/>\n<meta name=\"twitter:site\" content=\"@PurdueHomeHort\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Rosie Lerner\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/\"},\"author\":{\"name\":\"Rosie Lerner\",\"@id\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/#\/schema\/person\/477baba12dde3a697415f60d785c9b1b\"},\"headline\":\"Sour mulch can burn tender plants\",\"datePublished\":\"2017-04-20T21:37:14+00:00\",\"dateModified\":\"2017-04-20T21:45:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/\"},\"wordCount\":455,\"publisher\":{\"@id\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/wp-content\/uploads\/sites\/2\/2017\/04\/Cleome_20plants700-300x199.jpg\",\"articleSection\":[\"Gardening\",\"Seasonal Information\",\"Spring\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/\",\"url\":\"https:\/\/www.purdue.edu\/hla\/sites\/yardandgarden\/sour-mulch-can-burn-tender-plants-2\/\",\"name\":\"Sour mulch can burn tender plants - 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