I haven't tried to grow a catalpa from seed. However, the way that catalpa seedlings grow abundantly near mature trees I have observed--both in eastern and western Massachusetts--suggest they grow easily. My theory is that snow plowing has a lot to do with getting the beans buried and off to the sides of roads or parking lots, where they manage to grow without interference from lawn mowers or other controlled landscaping.
Bignonia Catalpa
Yes, Kentucky bean is an angiosperm. Angiosperms are flowering plants that produce seeds enclosed within fruits, and Kentucky bean produces seeds within pods, which make it an angiosperm.
Catalpa - The Indian Bean Tree
Yes they can. You can use rockwool cubes or a mixture of perlite/vermiculite to start bean seeds off.
They aren't edible, but some people report that they can be used to keep moles out of your yard.
It could be a Catalpa (http://en.wikipedia.org/wiki/Catalpa).
Does bean plant produces seeds in long pods
Japanese Empress Tree or Paulownia tomentosa
about around 5&7 seeds
A squash plant grows faster than bean plant
a bean plant produces seeds in long pods ( yes or not)
where do green bean grow