Variety traits

St. John's wort plant height

Hypericum L.

An important morphological trait of Hypericum perforatum that determines the suitability for mechanized harvesting and the overall productivity of the plantation.

In the reference 13 varieties crop St. John's wort, where this is mentioned in the description.

The stem height of Hypericum perforatum usually ranges from 30 to 100 cm, although in specific field experiments, values are more frequently 55–73 cm. This parameter is subject to significant changes depending on light intensity, soil fertility, and cultivation methods, including the potential for forming prostrate shapes under varying lighting conditions.

Measurements are taken during the mass flowering phase, as this is the period when medicinal raw materials are harvested. Height is measured as the distance from the soil surface to the tip of the main stem or inflorescence. For breeding purposes, selection focuses on developing an optimal habitus that ensures ease of mechanized harvesting of the upper part of the plant and a high yield of marketable biomass.

General information about the subject — on the page Plant height.

Sources8

Varieties of St. John's wort mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.