Gleditsia triacanthos

Honey Locust, Thorny Locust at Watson Green Space

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Identification history

Gleditsia triacanthos	23 Feb 2024	abread111
Indigofera australis subsp. australis	23 Feb 2024	CarbonAI
Gleditsia triacanthos	23 Feb 2024	abread111

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User's notes

long pods, pinnate leaves, in a planted bed, which contains a lot of weeds, blackberry (sprayed), Vinca...

9 comments

abread111 wrote:

23 Feb 2024

@Tapirlord can you change the description for this species please, to say "pinnate or bipinnate leaves" as in PlantNet

abread111 wrote:

24 Feb 2024

Yeah @Waltraud pods galore

Mike wrote:

24 Feb 2024

Three varieties of Gleditsia triacanthos are listed in ACT Infrastructure Guide 25, Plant Species for Urban Landscape Projects. These are supposedly thornless, but at least one can produce thorny suckers or seedlings.

waltraud wrote:

24 Feb 2024

yes Barb, I saw 2 Gleditsia trees growing side by side on my way to the Gym the other day; both of same size, one with and one without pods ...
Those planted close to Hackett shopping center and the Fair about 10+years ago old, have (so far?) no pods. I still wonder whether there are sterile cultivars around...

abread111 wrote:

24 Feb 2024

@Mike
See https://caws.org.nz/PPQ8910/PPQ%2009-3%20pp101-105%20Csurhes.pdf a paper from 10 years ago which explains that the thornless varieties still produce a proportion of seedlings with thorns.
Now may be a good time to lobby TCCS to remove sleeper weeds like this one from MIS25. The Auditor has released a report with recommendation 1 being to review MIS25 with focus on climate ready species, but other issues of potential invasiveness could no doubt be included in the review if/when it is carried out.

abread111 wrote:

24 Feb 2024

Waltraud, there is at least one sterile variety, Moraine, actually a male clone. It is included in the list of varieties in https://keyserver.lucidcentral.org/weeds/data/media/Html/gleditsia_triacanthos.htm but the info that it is sterile comes from European sources when I did a Google search. It is not in MIS25 - too large for street planting and subject to branch break in wind.

waltraud wrote:

25 Feb 2024

There is an Invasive Plants Working Group meeting coming up 4th April - I was told that I'm not allowed to attend because ParkCare groups have one rep - perhaps the forum is the right place to bring this topic up. Im lobbying already so many topics that I feel a bit overwhelmed I must say...

Mike wrote:

25 Feb 2024

Last year @MichaelMulvaney set up a list of sleeper weeds Sleeper Weeds - still being planted with the aim of getting these removed from planting lists. I put some of my sightings in a collection that anyone can add to. I think there are many other plants that we know are becoming invasive. Gleditsia triacanthos is listed as High Priority in the ACT List of naturalised and doubtfully naturalised alien plants, and is a species in Field Maps.

MichaelMulvaney wrote:

25 Feb 2024

Thanks Waltraud - FOG has representatives at the weeds working group and has raised sleeper weeds previously and got some action - we will keep at it.

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