I have seen Paulownia do 6-8' in one year after it had established a root system...but why would you want this darned thing> It is flowery - true - but the wood is weaker than balsa, it is very short lived, it makes a hell of a mess, and it is an invasive exotic.
I bought a Paulownia at (of all places) Home Depot. It is a Paulownia kawakamii. It was 2 feet tall when I bought it. The first year it grew 8 feet, this is it's second year (third growing season) and it is about 20 feet tall. These are very fast growning trees, and they are actually also hardwood.
Not sure about the "weed" issue! I guess what you are talking about are a Paulownia tormentosa (syn. P. imperialis) and definatley not related to Poinciana! This is a tree from China growing up to 50ft tall - and yes indeed wery farst the first years, I would say up to
5-6ft the first year. But it does not send out runners and it does not flower the first years! So it will deffinately not pop up in your lawn the first years - what happens when it do flower and set seed i don't know though! I think the other guys have an other plant in mind! best wishes
It can actually put on upto 10-12' feet annually when established (it is often cooppiced each year to maintain a smaller size and increase foliage production) and is not the slightest bit invasive in many cooler parts of the country where the seeds are unable to ripen. And while it can colonize areas, it demures to hardier competition in time, so should not be considered a threatening exotic species. The wood is soft and can be brittle when green but is hard and strong once dried and is extremely valuable for furniture making and construction purposes, specially in Asia where it orginated and where other timber sources are in short supply.
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