Remy RoseApr 30
(NE USA) How I feel every time I'm picking all the invasive Red Dead Nettle that's choking out the sedges and such, lol...

I get there's supposed to be a line between naturalized and invasive, but from where I'm standing Lamium purpureum definitely crosses that threshold. Also it doesn't even taste good! And it spreads powdery mildew to my Monarda.

#invasiveweed #garden @[email protected] #shitpost
Remy RoseApr 1
This is a fucking disgrace... The banks of the #SchuylkillRiver , at least from #Royersford to #Phoenixville , are like 99% invasive plants. I've walked bith sides of it pretty extensively for years. It's almost nothing but Amur Honeysuckle and Lesser Celandine. Why have we allowed this to happen and to continue? I see it every spring, but I don't know what to do about it. The scale of the problem is just overwhelming...

#invasiveweed #environmentalism
Jon SullivanFeb 6, 2025

Clockweed (*Oenothera lindheimeri*) has been one of the latest fashions in garden landscaping around Ōtautahi-Christchurch, NZ. Especially after the earthquakes, it's been planted around a lot of new buildings.

Would we widely plant yet another exotic plant that will go wild in NZ?

Yes, yes of course we would.

https://inaturalist.nz/observations/260791139

#weed #naturalisation #InvasiveWeed #nz

clockweed (Oenothera lindheimeri)

clockweed from Christchurch Central City, Christchurch, New Zealand on February 6, 2025 at 11:30 AM by Jon Sullivan. Wild in gravel along Manchester Street. Photographed during today's Waitangi Day hikoi.

iNaturalist NZ
Jon SullivanOct 16, 2024

Here's a plant to look out for in Ōtautahi-Christchurch city: long-flowered Veldt grass, *Ehrharta longiflora*. I found it in flower biking home from work.

It's only known in the South Island from the base of Hackthorne Road in Christchurch. The City Council and ECan have been spraying it when it appears. We're not sure if it's anywhere else.

This is how weeds start. Please look out for it and report it on #iNaturalist.

https://inaturalist.nz/observations/247594890

#nz #Christchurch #botany #weed #InvasiveWeed

longflower veldtgrass (Ehrharta longiflora)

longflower veldtgrass from Cashmere, Christchurch 8022, New Zealand on October 16, 2024 at 06:24 PM by Jon Sullivan. It's back again.

iNaturalist NZ
Jon SullivanDec 21, 2023

I went into central #Christchurch to do my Xmas shopping and found the first patch of Nemesia floribunda, common lionface, that's been seen in the central city.

It's a weed from South Africa that's abundant on Otago Peninsula but absent from Banks Peninsula. I made the 1st record of it for Canterbury in 2014, at Lincoln, and pulled it up. It showed up in Christchurch in 2017, on the Main South Road railway bridge, and has been slowly spreading.

https://inaturalist.nz/observations/194487868

#botany #InvasiveWeed

Common Lionface (Nemesia floribunda)

Common Lionface from Christchurch including Banks Peninsula, Canterbury, New Zealand on December 21, 2023 at 12:19 PM by Jon Sullivan. This is the first time I've seen any *Nemesia floribunda* in the central city.

iNaturalist NZ
Show threadJon SullivanDec 20, 2023

@cbuddenhagen Thanks. I vaguely remember hearing about that, but had forgotten to look up the paper. I appreciate the link.

There's a lot of Japanese knotweed wild on the West Coast, in places where there's also plenty of native pohuehue (esp. Muehlenbeckia autralis). I'll need to keep a closer eye out for possible hybrids.

#botany #hybrids #InvasiveWeed

Jon SullivanNov 22, 2022
I spent part of today showing Environment Canterbury staff the only known spot in the South Island with long-flowered Veldt grass, Ehrharta longiflora. It's a potential new weed, and it's so far only known from one location in Ōtautahi-Christchurch (at the base of Hackthorne Road). Please keep an eye out for it, and upload a photo to #iNaturalist if you think you've found it.
https://inaturalist.nz/observations/139094019
#weed #InvasiveWeed #BiologicalInvasions
Longflower Veldtgrass (Ehrharta longiflora)

longflower veldtgrass from Christchurch including Banks Peninsula, Canterbury, New Zealand on October 17, 2022 at 06:38 PM by Jon Sullivan

iNaturalist NZ
Jon SullivanNov 21, 2022

Yesterday @KorimakoEcology posted about what a horrible weed Phoenix palm is becoming in parts of NZ. Inspired by that, I went through the observations on #iNaturalistNZ and set "Organism is wild" to "No" for about 50 observations of clearly planted palms. Now, a search for Phoenix palm correctly maps out wild Phoenix palms. (When uploading to #iNaturalist, please do always check the "captive/cultivated" box for planted plants.)
https://inaturalist.nz/observations?order_by=observed_on&place_id=6803&taxon_id=78554

#PhoenixPalms #InvasiveWeed #iNaturalist

Observations

Canary Island palm from New Zealand

iNaturalist NZ
Andy McKayNov 20, 2022

A good example of why #PhoenixPalms are such a problem #InvasiveWeed.

They happily germinate in complete darkness, and this one has pushed up through the pavement and is looking very healthy.

There is the stump of an adult palm on the other side of the fence that was cut down ~18 months ago.