Meanings of spread head in English

They grow from forty to sixty feet high, and have large spreading heads.

This is a very vigorous-growing species, with a wide, spreading head of rather upright-growing branches.

He noticed that the dwarf pine, under whose spreading head his darling sat when he saw her first, had been cut down.

Fine, spreading heads adorned the tops of the stubs of trees that had received such (apparently) cruel treatment eighteen months before.

Don't expect more pointed information about humanity's production and consumption; global inequalities hardly get a look-in, even in a two-page spread headed "One Day's Food".