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well it can be messy dropping both leaves and the papery brown seed capsules the fall (but lots of deciduous trees are doing this now). under the "right" conditions it can seed itself around the garden but don't think it's much of a spreader into wild or natural areas---especially those areas that have dry summers like the "west coast". that said it can be a rather attractive small tree with the interestingly "cut" foliage and the yellow summer flowers combined with good tolerance of heat, alkaline soils, and short periods of drought. "September" is a form which flowers in the fall (hence the name).
that said, there is no perfect tree and most all of them have both objective and subjective good and bad points so it comes down to what you can obtain (relatively) easily and otherwise is suitable for both your particular climate, the space you have to grow it, and what particular purposes you wish to use the plant for---shade, shelter, screening, specimen ornamental, food for you or other creatures, etc., etc.
hope this is of at least a little help and interest to you.
They brought them to FL sometime in the 20's or 30's to suck out the everglades. The people behind me had them lined up in their back yard blocking my west sky when using my scopes when i lived in Tampa. Everytime we had a super freeze they would die back and get stumped to about 10 ft high and then grow 40 ft again only to get cut back again. Super ugly and messy tree.
They brought them to FL sometime in the 20's or 30's to suck out the everglades. The people behind me had them lined up in their back yard blocking my west sky when using my scopes when i lived in Tampa. Everytime we had a super freeze they would die back and get stumped to about 10 ft high and then grow 40 ft again only to get cut back again. Super ugly and messy tree.
yes, some plants can become invasive especially if environmental conditions are optimum for their growth and reproduction. FWIW, the paulownia tree you planted can become invasive as well---again most likely if growing conditions meet all it's needs. FWIW, it appears at this point that for you that's probably not going to be a problem because soil and climate don't appear to be optimal for it's needs but we'll see.
yes, some plants can become invasive especially if environmental conditions are optimum for their growth and reproduction. FWIW, the paulownia tree you planted can become invasive as well---again most likely if growing conditions meet all it's needs. FWIW, it appears at this point that for you that's probably not going to be a problem because soil and climate don't appear to be optimal for it's needs but we'll see.
I have a feeling in Feb it will start to bud and go nuts in the spring. If it drops it leaves in Aug again then we know it must be normal for my area.
I have one that I started from seed off of a tree in Arkansas that was so pretty every year. It has not liked something about where I planted it. It's still alive, but not growing wildly. As a matter of fact, it's the second one I have planted in the same spot (a glutton for punishment). Maybe they like drier soil, like Arkansas (mountainous region), although I did spot a pretty large one blooming nicely in a town about 20 miles from here the other day! I was so surprised, I had never seen that tree before now, and I could tell it had been there for quite a few years.
One good thing, if I ever want any more seeds or maybe seedlings, I know where to get them without having to go to Arkansas.
They're decent small trees, especially for difficult climates like the Denver area and Chicagoland.
There's a related species, Koelreuteria bipinnata: Chinese Flame-Tree that is a LOT more attractive IMO. It's larger, has beautiful salmon/pink lanterns in the fall, then finally drops its leaves for the winter. You'll see a lot of them in southern CA. They don't take as much cold as the one you are inquiring about.
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