Q - if a young tulip tree (Liriodendron tulipifera) were to be topped off at say 4 metres, and generally kept to size over time, how would it do? Flowering takes years with tulip trees anyway but how would the 'dwarfing' of the tree affect this?? All thoughts welcome!!
They're naturally big trees and want to get big. If you don't have room for a big tree, go for something smaller.
The natural shape and structure of a liriodendron will be ruined by pruning and, as they are vigorous, you'll have to keep pruning and you'll lose its flower power.
If you want a tree about 4m high with lovely fan shaped leaves that turn golden in autumn, try a ginkgo biloba compacta instead -
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw