<\/p>\n We all admire the colorful cascade of leaves from deciduous trees in the fall, but when needles start dropping from your favorite pine or spruce, it\u2019s hard not to worry.<\/p>\n A little needle loss is natural for all conifers. But if it\u2019s happening at the wrong time of year, or in large amounts, it could be a sign that something is wrong.<\/p>\n It could be caused by something minor like a dry summer or it could be a sign of a deadly fungal disease.<\/p>\n So how can you tell if the needle drop is a normal part of your plant\u2019s lifecycle, or a red flag? That\u2019s what we\u2019re going to explore in this guide.<\/p>\n Here\u2019s what we\u2019ll cover:<\/p>\n This first cause might seem a little obvious, but I want to go over it because it\u2019s not commonly known that some conifers are deciduous.<\/p>\n They\u2019re uncommon in the garden, but they do exist.<\/p>\n Many of us imagine that all conifers are evergreens, but there are some species that are deciduous.<\/p>\n These will drop all of their needles in the fall and grow new ones in the spring.<\/p>\n Larches (Larix<\/em> spp.)<\/a><\/strong> are the most famous deciduous conifers, with their needles turning brilliant yellow in the fall.<\/p>\n<\/div>\n<\/div>\n Dawn redwoods (Metasequoia glyptostroboides<\/em>), bald cypress (Taxodium<\/em> spp.), and golden larches (Psuedolarix amabilis<\/em>) also do the same.<\/p>\n If one of these trees is shedding needles in the spring or summer, it\u2019s not part of the natural lifecycle and will require investigation. But if it\u2019s autumn, just enjoy the show!<\/p>\n Many different diseases can cause needles to change color and drop.<\/p>\n Dothistroma needle blight (Dothistroma septosporum<\/em>) causes dark green bands and yellow or tan spots, while brown spot needle blight (Mycosphaerella dearnessii<\/em>) causes circular brown or yellow spots.<\/p>\n After the needles become symptomatic, they\u2019ll drop. Both of these fungal diseases are found in most pine species<\/a><\/strong>.<\/p>\n Junipers<\/a><\/strong> are subject to twig blight, caused by fungi in the Phomopsis<\/em> and Kabatina<\/em> genera.<\/p>\n Infection can cause entire twigs and stems to turn brown or yellow, often accompanied by black fungal spots.<\/p>\n The symptomatic foliage may persist or fall from the tree.<\/p>\n Needle cast caused by Rhizosphaera kalkhoffii<\/em> or Stigmina lautii<\/em> causes discoloration and drop in spruce trees.<\/p>\n<\/div>\n<\/div>\n In Douglas firs, needle cast caused by Rhabdocline<\/em> species and Swiss needle cast (Phaeocryptopus gaeumannii<\/em>) causes browning or yellowing and falling foliage.<\/p>\n Lophodermium lacerum<\/em> affects grand fir (Abies grandis<\/em>) and balsam fir (A. balsamea<\/em>).<\/p>\n If the needle death is appearing on the exterior of the tree or you see shedding during a time of year that\u2019s not normal, it\u2019s worth taking a sample to your local university extension office to confirm whether or not it\u2019s caused by a disease.<\/p>\n You can then treat accordingly.<\/p>\n If the weather has been dry for a long time, especially during hot temperatures, it\u2019s entirely possible your tree is experiencing drought stress.<\/p>\n Often, the first sign is yellowing of the needle tips. The new growing tips might die, as well.<\/p>\n During periods of drought, conifers may also drop needles as a way of conserving moisture, reducing the amount of foliage that requires moisture.<\/p>\n Sometimes the needles will turn yellow, but often they\u2019ll just dry out without changing color at all.<\/p>\n If you\u2019ve ever swept up needles after your living Christmas tree was past its prime, that\u2019s what they look like.<\/p>\n A few weeks of drought usually isn\u2019t enough to cause stress in established, healthy specimens but extended drought, especially over several years, can cause problems.<\/p>\n Of course, the solution here is to make sure your conifer is receiving the right amount of water, which varies according to the species.<\/p>\n<\/div>\n<\/div>\n A juniper might be fine while a redwood might be in serious trouble in the same environment.<\/p>\n Being familiar with the needs of the species you are growing means you can irrigate accordingly.<\/p>\n Some conifers are sensitive to extreme heat. Well, any plant is susceptible to stress during prolonged periods of exceptional heat, but some species suffer in seasonal heatwaves.<\/p>\n Douglas fir (Pseudotsuga menziesii<\/em>), silver fir (Abies alba<\/em>), Norway spruce (Picea abies<\/em>), and Atlas cedar (Cedrus atlantica<\/em>) should all be protected from prolonged heat and you should avoid growing these species in hot, humid climates.<\/p>\n The Pacific Northwest, also known as conifer heaven, has recently had several years of extreme heat in the summer with record-breaking temperatures. The local firs, pines, and cedars have taken a real beating.<\/p>\n The university extension offices were flooded with samples and images of landscape trees looking decidedly worse for wear. But even if you aren\u2019t experiencing shocking heatwaves, higher than average temperatures can cause your conifers to suffer.<\/p>\n<\/div>\n<\/div>\n Heat stress typically shows up as brown needles on the exterior parts of the plant. The younger growth is more susceptible to damage and it generally turns brown and falls off first. Continued stress will cause older foliage to do the same.<\/p>\n There isn\u2019t much you can do unless your conifer is growing in a container and you can move it somewhere cool during a heatwave.<\/p>\n Otherwise, just keep the soil moist and if the tree is small or you\u2019re growing a shrub, consider propping an umbrella or shade cloth over it during the heat of the day.<\/p>\n Anything that causes injury to a tree can result in dropping foliage. The two major concerns are root damage and herbicide injury.<\/p>\n Root damage can come in the form of rot, which can be caused by a disease or by drowning roots with too much water, but it can also be something as simple as compacting the soil by driving over the roots or chopping some up with the lawn mower.<\/p>\n Herbicide damage, on the other hand, is harder to identify. You don\u2019t have to spray the plant directly, either. Drift on the wind when you or a neighbor is spraying nearby can cause damage.<\/p>\n Herbicides are made to kill plants, and while some species are resistant, others might not be.<\/p>\n The tolerance varies depending on the type of herbicide and the species it is used on. Dormant trees are usually tolerant to glyphosate, though it will harm any living tree.<\/p>\n<\/div>\n<\/div>\n Spruces and firs are sensitive to simazine, all conifers are sensitive to picloram, and spruces are sensitive to phenoxy-type herbicides.<\/p>\n One clue to whether needle drop is a result of herbicide damage is if all the plants in the area show some type of damage \u2013\u00a0even if they are different species.<\/p>\n There are few diseases that will affect roses<\/a><\/strong>, conifers, Japanese maples<\/a><\/strong>, echinacea<\/a><\/strong>, and lettuce, so if you had all of these growing in the same area and all of them were looking bad, the first thing I\u2019d consider is herbicide damage.<\/p>\n There are lots of insects that feed on conifers and almost all of them can cause needle drop depending on the severity of the infestation.<\/p>\n Spider mites<\/a><\/strong> are a super common pest. They love the same hot, dry conditions that many pines and junipers thrive in and they\u2019ll feed on the plant using their sapsucking mouthparts.<\/p>\n As they feed, the needles turn yellow or red and fall like raindrops. Scale insects<\/a><\/strong> do similar damage.<\/p>\n<\/div>\n<\/div>\n Borers are the other major pest to watch for. Bark beetles, pine moths, clearwing moths, pine weevils, and more will chew on the plant material and cause needle discoloration and drop.<\/p>\n The species of pest depends on the species of conifer and there are many different types, so it\u2019s a matter of understanding the particular ones that attack your particular plant.<\/p>\n All evergreens drop some<\/em> needles over the course of their lives. The needles don\u2019t have an indefinite lifespan and at some point they will age and die, dropping to the ground.<\/p>\n The lifespan of the needles depends on the species, but most live for a few years before they need to be replaced.<\/p>\n I can tell you that the first time my Japanese white pine<\/a><\/strong> started shedding its needles, I went into full panic mode.<\/p>\n Luckily,\u00a0before I started pulling out my hair, an arborist friend told me that all was well and it was totally normal.<\/p>\n Conifers with scale-like leaves also drop their foliage as it dies off. More than one gardener has had their own mini panic when their western cedar or arborvitae started turning brown.<\/p>\n A small percentage of leaves turning brown or yellow and falling is totally normal. The trick is to understand the shedding process of your particular species.<\/p>\n Arborvitae<\/a><\/strong> shed in the fall, when some of the inner branches turn brown. They tend to hang out for a few months before shedding.<\/p>\n![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Conifer-Needle-Drop-Feature.jpg\")
<\/figure>\n<\/div>\n7 Causes of Needle Drop in Conifers<\/h2>\n<\/div>\n
1. Deciduous Conifers<\/h2>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Deciduous-Trees-Dropping-Needles.jpg\")
<\/figure>\n<\/div>\n2. Disease<\/h2>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Needles-Dropped-from-a-Conifer.jpg\")
<\/figure>\n<\/div>\n3. Drought<\/h2>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Conifer-Needles-Turned-Brown.jpg\")
<\/figure>\n<\/div>\n4. Heat Stress<\/h2>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Conifer-Needles-Discolored.jpg\")
<\/figure>\n<\/div>\n5. Injury<\/h2>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Spraying-Herbicide-in-the-Garden.jpg\")
<\/figure>\n<\/div>\n6. Pest Infestation<\/h2>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Conifer-Needles-with-Disease.jpg\")
<\/figure>\n<\/div>\n7. Seasonal Drop<\/h2>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Japanese-White-PIne-in-the-Garden.jpg\")
<\/figure>\n<\/div>\n
![\"A](\"https:\/\/gardenerspath.com\/wp-content\/uploads\/2025\/05\/Conifer-Dropping-Needles.jpg\")