I can say from experience that i have seen tagasaste grow in a wet climate.... we had some growing at our colledge that received a lot of water and that was in sub-tropics.... so not sure where that info comes from that it doesnt like wet feet.
I will say though that there are other alternatives worth consideration. I have at least a dozen good sized Leucaena with many more young ones that have self sown in the front of my property that has been used to establish some rainforest species.(was going to transplant the young ones into pots this arvo when its a bit cooler) This plant will crop close to 4 times in one season which bees love!! with my chooks making a bee-line to them b4 any other plant when i let them free range to collect the seeds that fall to the ground when rdy.
The other consideration is Pidgeon Pea. Both these plants are high in yield and protein, fixing nitrogen, establishing other trees and Leucaenas' roots can smash through rocks! Plus work well in the 'chop and drop' as the are fantastic in establishing alley cropping and are drought proof. Wild life like 'water dragons' have made themselves there home in this are where its been chopped and dropped as well.(Something that freaked out my sister when we were harvesting some seeds she no longer goes into that area!)
Overall we used pidgeon pea above tagaste at colledge as yields and growth and use in making compost seemed to exceed that of tagaste.... .just an observation.... but then that is my climate as well and not sure how these plants go in southern areas. We do get occassional frost here and the Leucaena pulled up fine.
That's all from me.... i think this is a good follow up topic on experimenting all 3 of these plants on you properties guys and then letting us know the results!
Township of Boonah (pop 3,000)
2.7 acres of gently sloping volcanic soil
"Progress is a spiral; the pendulum swings back as well as forward. The new postindustrial world, for which many of us are striving, will see an ecological renaissance".... Rober Hart