Photograph via snooOG

Focused on the very important environmental issue of noxious exotic species from around the world invading, degrading and destroying native ecosystems and costing nations billions.

Our submission content consists of news, educational resources, discussion and photos of field sightings.
The goal of the sub is to better inform and educate our subscribers on the critical topic of invasive species.

An invasive species is an organism not native to a specific location, with a sustained population and which damages the environment, human economy and/or human health

This is an important topic, since many organisms, especially island populations, are threatened or already extinct at the hands of these noxious invaders.

Post flairs


For reporting sightings of invasive species. Please include a location and proof!


For questions, discussions and articles on managing invasive species.


For full articles on invasive species issues.


For posts on the problems invasive species cause.

Law and Policy

For the laws, policies and regulations around invasive species.

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  • /r/invasivespecies

    17,781 Subscribers


    To pull or not to pull: Garlic Mustard in North America

    I really enjoy pulling Garlic Mustard. Though it's a never-ending task, it is extremely satisfying, and the leaves are rather yummy. My friends and I went on a hike recently (Eastern Pennsylvania) and picked bundles of garlic mustard along the way, pulling them up from their roots and stashing them in trash bags.

    Upon researching proper disposal, I came across some articles (linked below) that suggest it is best to leave Garlic Mustard alone.


    I understand that most invasive species management comes with lots of nuance, though I thought there was a pretty strong general consensus among ecologists that it is best to pull them (of course, considering when they are flowering/going to seed). I've been to plenty of state parks and conservation centers that have buckets along the trails dedicated to collecting Garlic Mustard. Though, after reading this article, I am wondering if it is true that it is best to leave Garlic Mustard alone, and that most people are just misinformed about managing it. I am curious to hear any opinions/insight on the matter! Thanks in advance.

    20:13 UTC


    Just wondering if anyone here has any uses or repurposing methods for invasives??

    Hey all, I’m in the work truck on my way to a job site this morning and me and my coworker were pondering about Tree of heaven wood. Particularly because it’s so soft yet brittle. Do you think you could craft anything with it.

    Furthermore; are there any invasive species, not strictly plants, that you repurpose or know can be? Could be anything from plants herbal uses like mullein - to bones from invasive starlings - to fish emulsion from invasive goby - just kind of curious. Thanks for any ideas you have, just kind of using this as a thought experiment!

    Tl;dr - this is a thread for upcycling and repurposing invasive species matter

    12:54 UTC


    Tree of heaven stump treatment

    Hi! I have two tree of heaven trees on a neighbors property that we are removing. Although I would like to wait and do the back and squirt treatment method, he is eager to do that takedown this week (new roof getting put on). With that in mind I will be treating the stump.

    Reading the instructions for stump treatment has been confusing me (https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5410131.pdf) It specifies the ratio of herbicide to crop or bark oil, but not the concentration of herbicide. Everything I’m seeing at Home Depot or our landscaping stores are ready made formulations such as these. Has anyone done this and can offer advice?



    22:24 UTC


    Weird glyphosate/porcelain berry question

    I have a large hill in my backyard that is just covered in porcelain berry. It's too steep and thick for me to safely walk with any kind of backpack sprayer on. I was just thinking that it would be so easy to stand at the top and douse it with a super soaker. There's nothing around I'd have to worry about for overspray. Anyone ever done such a thing?

    Glyphosate haters gonna hate hate hate...

    19:45 UTC


    I, a newbie, composted and mulched goutweed

    In 2016 we bought a house with goutweed groundcover in a patch on the front yard. I had ambitions of a native garden that would dazzle the neighborhood with towering umbels and visiting polinators. So I dug out all that ugly, three-leaved, sour-mint scented groundcover and tossed it into the compost. Yay, me! I’m good at gardening! Not sure what that stuff was but it’s long gone!

    I hand pulled for years, solarized, smothered, deep mulched, responsibly disposed, and kept a decent balance. I called it “the devil’s public hair” on all the local gardening forums. Everyone laughed.

    Eight years hundreds spent on amazing native plants who have well established themselves, one mild winter, a ton of spring rain: goutweed everywhere. It’s back with a vengeance. The natives who could outlive it have been pressed aside or have become extremely leggy to escape it. Many just didn’t come back. Handweeding over the first few weeks of summer led to 30+ contractor bags on the curb, an injury to my wrists and hands and now I can’t paint, and almost no noticeable impact to this durable population of goutweed.

    I finally became convinced, against my entire soul’s protest, to explore the nuclear option.

    I applied glyphosate, my first ever application of herbicide, for the first time yesterday. The goutweed just giggled. How many applications? How many times?

    Can I go back in time and tell my naive new homeowner not to mulch this poison?

    13:59 UTC


    Staghorn Sumac or Tree of Hell?

    My app says this is staghorn sumac but it looks dangerously similar to tree of heaven. Any chance someone could confirm??

    12:43 UTC


    Is Cherry Laurel invasive or what?

    I just purchased the one acre parcel of un-develop-able land next to my house in Atlanta. It's a true old growth forest, but is also cursed with many invasives (thorny olive, mahonia, privet etc.) that I'm currently removing. An arborist I had out to cable a big oak told me I should cut down the cherry laurel trees too. But my PictureThis app calls it Carolina Cherry Laurel so I'm wondering if this is really an invasive plant being as the Carolinas are not too far away. Should I let it stay or get rid of it?

    12:38 UTC


    Drill and pill for tree of heaven

    I am getting increasingly worried and dismayed about the abundance of tree of heaven in my area. I’d love to start an initiative to start combatting them along our roadways and elsewhere. I understand that the most effective method of killing involves girdling during late summer/early fall and applying herbicide. I’m wondering if the drill and pill method has been attempted with any success.

    16:56 UTC


    Are any non-native species beneficial to their new ecosystems?

    Everyone always attribute non native species as bad for ecpsystems or invasive, and for some species this is definitely the case (feral cats, spotted lanternfly, and lionfish just to name a few). But are there any cases where non-native species can be a good thing?

    I'm no biologist, but I'd think that in some cases, non-native species could A: fufil niches left by extinct/extripated native species, B: help control true invasive species, or C: serve as backup populations for species struggling in their native range.

    Are there any good examples of non-native species having positive effects, or at least no harmful effects on a new ecosystem?

    15:42 UTC


    Invasive Jumping Worms

    How do you get rid of them? I’m in New England and I think I got them through some contaminated compost I bought at Walmart. They are taking over the backyard where I am. They are so awful:(

    1 Comment
    04:59 UTC


    Are Giant Joro Spiders Invading Your Town?

    01:08 UTC


    Tree of heaven and concrete slabs

    Hi all! Might be a silly question but here it is.

    We moved into a house recently that were putting a ton of work into. Our neighbor has several trees of heaven (very invasive) next door. While we are working on getting them on board to cut them down, I have also been battling getting them off our property. Fairly successfully, but always a struggle.

    We are building up a patio on the back of the house, concrete slab with roof over it. I know that tree of heaven has crazy root system, and we had definitely removed old concrete on the side of the house that roots pushed up.

    My question is, is there any logic or does it make sense to lay any kind of root guard or root killer underneath the base material for the slab?
    Thank you in advance!

    00:06 UTC


    How get rid of this small Tree of Heaven

    Hi all, I have a baby tree of heaven growing out of a spot where I planted a hydrangea a couple of years ago. What is the best way to get rid of this thing without it spreading all over the place? Here are a couple of things to note:

    * It is close to the foundation of the house.

    * I would like to save the hydrangea, but willing to scarafice, if means totally getting rid of this thing.

    * This tree of heaven is isolated, there are no other ones in the surrounding area (almost seemed like it hitched a ride on the hydrangea).

    Here is a pic of the tree


    Here is main stem going into the hydrangea


    22:34 UTC


    Japanese Knotweed Eradication

    Deleted original post because the images took away my text.

    I figured I would share my results of dealing with Japanese knotweed. I had a fenced in portion of my yard that was engulfed by 6+ ft. tall JK. Last September, I applied an herbicide (Milestone) that I found mentioned in an MSU journal for this purpose. The first picture is the miniature growth I have experienced this year, which I treated with another round of Milestone a couple days ago. The second picture gives you a size reference of what the JK would have looked like without spraying. Other areas of my yard that had lower concentrations of JK have no sign of it. After battling this to no avail via cutting for years, I'm very pleased with the direction this is going with the Milestone and wanted to share/give hope to others out there.

    Spring regrowth after Milestone in 2023 only got a few inches tall

    Same timeframe, but this one was not sprayed in 2023. This is how tall the others would have been without Milestone

    14:24 UTC


    Anyone know what this is?

    Spotted outside of Chicago.

    13:54 UTC


    Spongy Moths

    Hi gang, I work for my State Government (U.S.) and they don’t seem to be taking the spongy moth colonization too seriously. It’s not like it’s record-breakingly huge or anything. I voiced concerns about it to my boss and explained that the area I live in was infested, and how hard it is on the people, and how badly our trees have been defoliated for the past 4 years. She insisted that it’s only a 1 year cycle, and that it ‘always seems bad while you’re in it’. I’ve been extensively researching spongy moths, and things are bad but they have the ability to improve, or get so much worse - really depends on us. Who should I bring my research to?

    12:37 UTC


    Invasive’s at garden centers

    Hello! I tried searching but it’s hard to find look this up without getting general posts about control.

    Has anyone tried discreetly spraying or killing the typical invasives that are sold at nursery’s or garden centers?

    I totally understand this is not a nice or appropriate action for the nursery and I’m not asking for advice or permission I’m just asking for anyones experience if they did this.

    11:05 UTC


    Have the oxeye daisies already won?

    This power line right of way was an oxeye daisy meadow last year, but got cleared by heavy equipment in early spring. I want to take the opportunity to plant native grasses and wildflowers in the fall.

    Along the sides of this clearing are daisies mixed with native and non-native vegetation, including a lot of poison oak. In the middle on the open ground are hundreds - thousands? - of little first year daisy seedlings. At the far end is a reservoir of daisies that's inaccessible in a steep thicket of brambles and poison oak.

    I've been pulling the daisies at the sides when they bud or flower. And I thought of killing the seedlings in the middle with herbicide or a weed torch. But that patch at the far end, as well as similar patches nearby, are going to keep reseeding this place. And the more the meadow grows, the harder it will be to get to the daisies and pull them without too much poison oak exposure.

    This is their time to flower so I'm out there pulling them every few days. It's hard to see myself doing this every year indefinitely. If I can't commit to a forever war against the daisies, is it even worth trying to stop them this year?

    21:52 UTC


    If injecting glyphosate into Japanese knotweed, do you have to inject into every stem?

    What the title says.

    I'm about to start working on a fairly small patch of Japanese knotweed, and to reduce impact on nearby plants I thought about injecting glyphosate into the stems like others have suggested.

    Is it necessary to inject into every stem, or is there a shared root system that will result in one plant taking its neighbors with it?

    14:25 UTC


    Would you trust "sterile cultivars" of invasive plants?

    Specifically asking in reference to Sunshine Ligustrum, but would like to know the general opinion on sterile cultivars of any invasive.

    Are there aspects of a sterile cultivar that would make it more or less likely to become not-sterile?

    Are there specific cultivars you wouldn't use even though they are labeled sterile? Why?

    19:48 UTC


    Would zoom animals survive California ecosystem if freed from San Diego Zoo?

    Let’s say a societal collapse let all the zoos animals escaped from the San Diego Zoo!

    Giraffes, Gorillas, Snakes, Lions, Monkeys, etc.

    Would there be a chance they could survive repopulate, and thrive in Southern California area? What ecological damage would monkeys, lions, and giraffes cause?

    19:32 UTC


    Removal of barberry in Massachusetts


    Before and after Japanese Barberry removal

    Been doing a project in Massachusetts. Removing Japanese Barberry, bushing bush, bittersweet and honeysuckle from the local park. Running volunteer days to restore the forest.

    11:54 UTC

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