PEP BB greywillow.sand.fivetrees - Plant Five "Poop Beast" Trees

Planted 5 cottonwood trees on a lush and green area of a berm that seems to get a lot of water.

I have read through the requirements for plant 5 trees and have some questions on the types of trees that are required to be planted.
Do the trees have to be weeping willow, cotton wood or poplar or can they be something else which does the same thing?

My take on achieving the BB is to get rid of water and waste lying around which is likely to be a pollutant to the surrounding area and can potentially get into waterways.
I have found this site.  It provides a plant resource for Australia. https://www.acs.edu.au/Info/Hobby/Landscaping/Wet-Soil-plants.aspx

Willows are a weed of national significance and cannot be sold or planted in NSW
https://weeds.dpi.nsw.gov.au/WeedListPublics/CategoryResults?showImages=True&categoryId=15&pageTitle=Plants%20that%20must%20not%20be%20sold%20anywhere%20in%20NSW
In short, to plant willow, we would be breaking the law.

Cottonwood and poplar species are reasonably difficult to establish in this area because during summer, the days can get to 45deg C (113 deg F) and be accompanied by a dry hot wind.  They are more suited to temperate climates with a higher rain fall. I have seen the wind cook all the leaves off a tree.  The other thing with these two plants is that they are not native to our area.  

Casurina species are naturalised/ native  to our area and achieve the same end result.
https://www.nurseriesonline.com.au/plant-index/australian-native-plants/casuarina/   As a serendipity, the seed pods are a food source for the endangered black cockatoo and other parrot species.
Can casurina be used as an alternative species to achieve the BB?
Thanks,  Appreciate your consideration and advice
Cheers

Well, this is where not living near Montana can be a challenge.  I can't plant some things from PEP due to local regulations as well.

Substituting doesn't count but I think any type of willow would be fine (not just weeping).

Keep in mind it just says you have to plant them, they don't have to grow to get the BB.  Montana gets up to 107F so maybe poplar would do ok in your area.  One way to find out...

I got cuttings from the local park and planted them along my fence line.

Mike Haasl wrote:  Montana gets up to 107F.

Montana's average high temp is 85F, yes it has gotten all the way up to 117F but only for a day and the number of days it has gotten above 90F in a row is 38 set back in 1922, completely different climate than anywhere in Australia.

Planting 5 poop beasts (and one spare). Willow rooted cuttings bought from a local Farmer's market.

I write about my experience with SKIP and collecting badge bits in a blog here: https://skipthejourney.wordpress.com/ please do consider checking it out.

I've been planning a quiet spot out near my garden. I first made a gazeebo out of dead trees, and now I am planting baby aspens in-between them to weave in and eventually give me more shade in the structure.  a TREE-ZEE-Bo lol! They came in pots, pretty cheap.  I planted them around my sun-set-sitting-spot. I'd like to NOT run all the way back to the house whenever I have to pee, (I'm super pregnant, so that happens a lot...) so now I have pee-loving aspens near my peaceful spot. YAY!