Crataegus ‘Smithiana"

Red Mexican Hawthorn at City Renewal Authority Area

Crataegus ‘Smithiana" at City Renewal Authority Area - 24 Mar 2024
Crataegus ‘Smithiana" at City Renewal Authority Area - 24 Mar 2024
Crataegus ‘Smithiana" at City Renewal Authority Area - 24 Mar 2024
Crataegus ‘Smithiana" at City Renewal Authority Area - 24 Mar 2024
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Identification history

Crataegus ‘Smithiana" 27 Mar 2024 MichaelMulvaney
Crataegus monogyna 24 Mar 2024 MAX

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Planted Hawthorn trees in Northbourne Ave. are (allowed) to Fruit prolifically, ensuring that the Seeds are spread Far & Wide by Birds into many Canberra Nature Park RESERVES. I have lost count of the 1000's of Hawthorn seedlings in Mt Majura Nature Reserve that Friends of Mt Majura Volunteers have to continuously remove / treat with Herbicide. Hawthorn is a Highly Invasive Exotic Species ! Why are these trees in Northbourne Avenue not being REMOVED ?? They contribute HUGELY to the continuous spread of this species into Nature reserves. This really is a No Brainer making 1000's of hours of Removal work for Volunteers and Parkcare Staff. High Time that the source of this problem is permanently removed. Come on "Managers" be Brave and take some initiative here. I really am tired of removing / treating Hawthorns from our Nature Reserves. Save some money too, because the continuous cost of treatment and removal is huge in both time and dollars. I hope this message doesn't fall on deaf ears please.

8 comments

   25 Mar 2024
Max I am away at the moment so can't be definitive but I think this is Crataegus smithanii while the hawthorn you are removing is C. monogyne - I still think your point of the government not growing wee
dy species is a good one - will check weed rating off. smithanii - or whatever species this is
   27 Mar 2024
Yes Crataegus smithiana - a hybrid that supposively spontaneously developed at Yarralu,la Nursery in teh 1920s - Probably not as invasive as Cratagues monogyna but one to watch for and is not recommended for use near a nature reserve
waltraud wrote:
   31 Mar 2024
Max
I think all Crataegus we remove from the nature reserve around the Fair is C. monogyna. There were huge monogyna hawthorns growing in the Fair residential estate which Village Building Company removed on my request in 2011, and in Valour Memorial Park. It took me more than 2 years and the support from a General during the launch of the refurbished park to have the Valour park specimens removed; ACT who manages Valour park on behalf of Fed Gov refused to tackle the Valour park hawthorns because of their heritage value...
There were a lot of quite large hawthorns which we removed from the Fair project site and further south. We now come across small ones which I think are mostly suckers from large specimens that we previously tackled ( I also noticed re-sprouting from previously cut & painted small specimens during our work party in Feb), and some may originate from the large hawthorns growing in the horse holding paddock south of Oldfields Lane where ParkCare volunteers are not permitted to work. From what I gathered, seeds have a short viability. Removal of parent C. monogyna combined with follow up should reduce the amount of small hawthorns over time.
I don't think that pollies follow CNM discussions but documenting new recruits of hawthorn can be useful to lobby the gov and gov agencies to remove / permit removal of specimens in the horse holding paddock.
Crataegus smithiana is listed as a suitable species in the Municipal Infrastructure Standard Part 25 Plant Species for Urban Landscape Projects; a fact sheet recommends to not plant the species close to nature reserves, creeks and waterways. To my knowledge MIS25 is regularly reviewed and species are taken from the list for a number of reasons including for being invasive (for instance Celtus australis). ParkCare volunteers may play a role by documenting invasive species that pop up in reserves.
cc
abread111
MichaelMulvaney
abread111 wrote:
   31 Mar 2024
In MIS25 there are currently 75 exotic trees listed for landscape use - many genera have several horticultural varieties listed - which are designated as restricted as they are not suitable for landscape use in natural areas because they are or have the potential to be invasive. (These are not on the pest species list which does now include Celtis australis Nettle Tree, Crataegus monogyna Hawthorn and some other invasive species.)
I think it would be valuable to include all the species designated in MIS25 as not suitable for natural areas in the list of sleeper weeds so they will be identified on CNM, and if necessary removed from the MIS25 recommended lists at the next review.
MAX wrote:
   31 Mar 2024
Unfortunately I remain Very Far from convinced that this Hawthorn "variety" is not invasive. I have seen various Hawthorn species growing in various countries in Europe and also Asia. The Berries are spread very long distances (ie 100 km+) by multiple species of Birds, especially migratory birds. I think if anyone was able to carry out a Genetic study of various Hawthorn species/ varieties/ Cultivars in Australia, their extensive Bird dispersal over large distances would come to light. There are multiple Bird species who feed on Hawthorn berries in Australia. The only solution is to remove ALL Hawthorn species altogether, everywhere, including socalled " Heritage" trees. Looking at these mature Hawthorn trees in Northbourne Avenue, They produce many 1000's of seeds for Birds, Bats, Possums, rats etc. To feast on. The woody seeds are indigestible and will pass through, with a free dose of fertiliser poop for miles around. We need to be much more vociferous about Invasive (woody) Weed Control measures. Our current policies are a hypocritical laughing stock joke, and what's worse, make even more work for everybody. Most disappointing and disheartening. No long term Leadership and Vision from policymakers and politicians alike. With all due respect.
waltraud wrote:
   1 Apr 2024
Max,
there are a lot of C. monogyna planted by humans in Hackett quite close to nature reserve, for instance along a lane way between French and Selwyn Streets. Interestingly, I don't see the species popping up in the reserve east of Hackett where I have been working regularly over the past 20 years. There is definitely no shortage of birds spreading seeds of species such as Privett, Ivy and Nettle tree of which I remove literally 100's each year from the drainage line; see for instance Ligustrum lucidum (Large-leaved Privet)
I think CNM is not the right place to lobby - it is certainly excellent for recording - and I'd suggest to write to your local members of the Assembly or the Conservator or the Commissioner or Biosecurity or the PCS director.
waltraud wrote:
   3 Apr 2024
Max, here is an example of a Crataegus monogyna resprouting after being tackled a while ago: Crataegus monogyna (Hawthorn)
I came across a number of similar re-sprouting situations and think quite a few of the small hawthorns we currently tackle in the reserve north of Oldfields Lane are either re-sprouts or suckers from the large plants tackled over the past 12 years. It is so important to cut low at the base and immediately paint / dab / spray with a 1:3 Glyphosate water mix not older than 2 weeks (depends on temperature). Often I find it is more work to tackle multi-stemmed re-sprouts than a single stemmed plant.
So don't despair! I think, over time the hawthorn numbers will go south particularly when the source at the horse holding paddock will be diminished.
Since about two years we noticed 2 new species - Viburnum tinus Viburnum tinus and Callery Pear Pyrus calleryana - popping up in the nature reserve close to The Fair estate. We haven't seen the species before in the area and numbers are quite alarming.... So by all means write to Biosecurity and your local members that these species should be declared pests and deleted from any list of species recommended for landscape projects such as planting along roads. The use of plants in the new North Watson landscaping is something to watch. If government uses for instance the invasive Callery pears such as those street trees at The Fair it will be a job forever to remove the recruits from the nature reserve. This is something I'm worrying about. With CNM and Field Maps, we have the tools to document invasive plant species in the reserves and I think the task is now to ensure government agencies respond accordingly.
cc
abread111
MichaelMulvaney
MAX wrote:
   3 Apr 2024
Hi Waltraud, Thanks for your additional comments and observations 🙂 Regarding the Viburnum and Pyrus weed seedlings increasingly being found in Mt Majura Nature Park, I can confirm with a high level of probability that the source of these new recruit seedlings is from the CTS10 The Fair Housing Estate, where both species have been widely planted unfortunately, Without due consideration for their known ability to go. "Feral". As a personal Anecdote, I removed one of the Viburnum shrubs from my own Townhouse garden because new seedlings were so problematic (100's every year). Even now 4 years or so later, I am still getting new Viburnum seedlings coming up in my garden every month, from the Berries/seeds dispersed from my original shrub. My inference is that the viability of Viburnum seeds lasts at least for 4+ years. Both Pyrus and Viburnum need to be REMOVED with Urgency from Urban Planting guides and lists ASAP as they are Clearly invasive into Nature Reserves.

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Location information

Sighting information

  • 16 - 100 Abundance
  • 24 Mar 2024 10:42 AM Recorded on
  • MAX Recorded by

Additional information

  • Berries around 1 cm diameter, 1000's of them ! Flower dimension
  • Greater than 5 metres Plant height
  • True In flower
  • True Shrub(s) planted

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