The vigor of Pelargonium zonale is a qualitative indicator of plant development energy, used in variety testing according to UPOV guidelines to determine cultivation technology.
In the reference
118
varieties
crop Horseshoe pelargonium,
where this is mentioned in the description.
The trait is assessed visually and recorded in categories of low, medium, or high vigor. It is important to distinguish this indicator from plant height, as vigor reflects the overall rate of vegetative biomass accumulation and the developmental energy of the variety, which is taken into account when planning planting density.
High vigor requires larger volumes of substrate and feeding areas to prevent shoot stretching, as well as stricter adherence to temperature regimes and the use of growth regulators. Utilizing this parameter helps avoid habit deformation and loss of aesthetic appeal, depending on the chosen type of container.
Under production conditions, a decrease in vigor in varieties characterized by energetic development often serves as an indicator of phytosanitary problems, including infection with viral diseases or bacteriosis caused by Xanthomonas pelargonii.
General information about the subject — on the page
Vigor.
Varieties of Horseshoe pelargonium 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.