Centranthus ruber

I think the feathery fruits are spread by wind; however I removed it also from notorious dumping sites in the nature reserve east of Mackenzie street, Hackett.

These were far from anywhere in a site where water spread could be a factor and did you note there were lots of them? Also notice the cleavers in the photo with them.

Barb, as I said I think the spread of seeds by wind and dumping of garden waste (the latter was most likely not at this site unless the farmer dumps waste).
A decade ago or so I tried to make the point to change the management of this area to exclude the drain lines and steep slope from horse holding but there seems to be resistance from government agencies.
I'm afraid the goal is to allow rampant degradation to make the case for bulldozing - I saw this with the grassy woodland south of the Australian Heritage Village which was gifted to the developer to build the Fair.
The area is close to a drain line and should have never be used for grazing, neither for cattle and definitely not for horses. As Ingwersen et al said in their 1974 vegetation study of Mts Ainslie and Majura, the (steeper slopes and) drain lines are not suitable for grazing. Seems clear to experts and volunteers but not to land manager unless of course there is a secret agenda to develop. I met 2 or 3 times with Parks staff, when Parks was still the manager (not a contractor) to suggest different management. The response was always negative and defensive, including that I should PROOF that degradation is from inappropriate management and lack of weed control.
This totally disrespectful request was of course to keep community an arm length away.
I requested one of the meetings when Parks announced superphosphating (!) of the horse holding paddock during drought (!!). The paddocks were overstocked with horses, and rabbits and kangaroo numbers were very high (it was before any control was carried out) and the Superphosphate was spread over close to bare soil. Superphosphate attaches to the minerals of clay and is transported with clay during rain events. The soils of the Watson Woodland (JRHP) have extreme phosphorous readings, probably the highest in the ACT. The phosphorous was transported via culverts under Antill street - I took photos after rain events that show the fan-shaped flow of water onto the Watson woodland but of course Parks ignored the documentation entirely.
And isn't the frequent change of staff fantastic? no one knows and no one has responsibility.
The horse holding paddocks east of Antill Street are now much degraded. I'm afraid the next step is to officially assess the degradation as being beyond improvement in preparation to bulldoze and develop as it was done with the land south of the previous Australian Heritage Village. I think it is always the same pattern.....
And of course, volunteers will be permitted to kill themselves to improve the fucked remaining grassy woodland with totally inadequate means (we are not even allowed to use our tools) and support.

Glad you were not at the meeting this morning Waltraud!