{"id":18626,"date":"2021-11-29T16:20:02","date_gmt":"2021-11-29T20:20:02","guid":{"rendered":"https:\/\/www.purdue.edu\/fnr\/extension\/?p=18626"},"modified":"2021-12-10T10:48:00","modified_gmt":"2021-12-10T14:48:00","slug":"question-why-are-the-gingko-leaves-not-falling","status":"publish","type":"post","link":"https:\/\/www.purdue.edu\/fnr\/extension\/question-why-are-the-gingko-leaves-not-falling\/","title":{"rendered":"Question: Why Are The Ginkgo Leaves Not Falling?"},"content":{"rendered":"

Question<\/em>: Often ginkgo trees will drop all of their leaves on a single day after a cold night. I thought that was going to be Monday at Purdue (left: leaves falling). But no, we\u2019re at Wednesday now (right) and this one changed its mind. Anyone know how common that is?<\/p>\n

\n

\"Ginkgo<\/a><\/p>\n

\"Ginkgo<\/a><\/p>\n<\/div>\n

<\/div>\n

Answer<\/em>: It was a very peculiar fall. The overall leaf drop was one to two weeks later than normal at least. An October with weather more like September has likely had some impact on this. Individual trees will vary some on their leaf drop timing, probably due to their geographic origin (for planted trees) and individual genetic variation. The severity and timing of frost\/freeze also influences strongly. As you can see, lots of variables!<\/p>\n

Leaf drop is not solely dependent on temperatures. There is a process of dormancy the tree follows to properly acclimate in preparation for winter. One of these is leaf drop, but it must go through the process of developing an abscission layer between the petiole base and branch. Most likely, the tree didn\u2019t drop leaves yet because this separation layer of chemicals hasn\u2019t fully responded yet. We often see frozen leaves on a tree and later they fall, but this is the result of sudden extreme cold ahead of proper dormancy routines.<\/p>\n

Resources:<\/strong>
\nFall Color Pigments<\/a>, Purdue Extension YouTube Channel
\nWhy Leaves Change Color \u2013 The Physiological Basis<\/a>,
\nOak Wilt in Indiana<\/a>, Purdue Landscape Report
\nDog Days of Summer Barking Early This Year<\/a>, Purdue Landscape Report
\nTulip Poplar Summer Leaf Drop<\/a>, Purdue Landscape Report
\nBe on the Lookout for Defoliated Viburnums and Viburnum Leaf Beetle<\/a>, Purdue Landscape Report
\nWill my Trees Recover After Losing Their Leaves?<\/a>, Purdue Landscape Report
\nWhat Do Trees Do in the Winter?<\/a>, Purdue Landscape Report
\nWhy Fall Color is Sometimes a Dud<\/a>, Purdue Landscape Report
\nAlternatives to Burning Bush For Fall Color<\/a>, Purdue Landscape Report
\nStart Preparing Trees for Winter and Next Year<\/a>, Purdue Landscape Report
\nID That Tree Winter Edition: Opposite Leaf Arrangement – Ohio buckeye, Red Maple<\/a>, Purdue Extension YouTube Channel
\nID That Tree Winter Edition: Alternate Leaf Arrangement – Black Walnut, Eastern Cottonwood<\/a>, Purdue Extension YouTube Channel
\nID That Tree Winter Edition: Alternate Leaf Arrangement – Honey Locust, Burr Oak<\/a>, Purdue Extension YouTube Channel<\/p>\n

Lenny Farlee<\/a>, Sustaining Hardwood Extension Specialist
\nPurdue University Department of Forestry and Natural Resources<\/p>\n

Lindsey Purcell<\/a>, Urban Forestry Specialist
\nPurdue University Department of Forestry and Natural Resources<\/p>\n","protected":false},"excerpt":{"rendered":"

Question: Often ginkgo trees will drop all of their leaves on a single day after a cold night. I thought that was going to be Monday at Purdue (left: leaves falling). But no, we\u2019re at Wednesday now (right) and this one changed its mind. Anyone know how common that is? Answer: It was a very […]<\/p>\n","protected":false},"author":54,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,49,53,54],"tags":[256,943,60,1533,1534,460,408,71,72,1113],"class_list":["post-18626","post","type-post","status-publish","format-standard","hentry","category-forestry","category-plants","category-urbanforestry","category-wildlife","tag-fnr","tag-fnr-extension","tag-forestry","tag-gingko","tag-ginkgo-tree","tag-leaves","tag-trees","tag-urban-forestry","tag-wildlife","tag-woodland","audience-for-enthusiasts","audience-for-homeowners","audience-for-landowners"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t