I read here that the size of the plants is 3-4 ft high ?? are those BS
trees
? I live in the land of BS where plants are typical 1.5 ft high and they
are
a typical "winter" crop many times they are harvested when it is already
freezing outside .. and indeed they thrive best on heavy clay like soils
like abundantly available around Brussels

My BS plants are easily 4-5 ft. high.