6

Is it true that some varieties of Paulownia are sterile? And if so, where are they sold?

3

Pollarded trees do not produce flowers, as these only form on mature wood. However this is a labour intensive solution. If you plant an invasive variety and stop pollarding you have gifted the neighbourhood with a problem.

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2

There is a species listed as non invasive, although they produce seeds. Paulownia elongata, a fast growing tree with many various uses. Sources may rise and fall, but Amazon is currently selling it.

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