Cultivation

Container Cultivation: Pelargonium grandiflorum

Pelargonium grandiflorum (Andrews) Willd.

Growing Pelargonium grandiflorum in containers requires strict adherence to a temperature cycle for flower induction and ensuring high substrate aeration to prevent rot.

In the reference 13 varieties crop Regal pelargonium, where this is mentioned in the description.

A period of cold dormancy is critical for successful flowering of regal pelargonium: after rooting, plants must be kept at +5…+8°C for 6–8 weeks. Ignoring this stage leads to an absence or extreme weakness of budding, which cannot be compensated for by other cultivation methods.

The root system of this crop is highly sensitive to waterlogging and the risk of Phytophthora and Botrytis infection, requiring the use of highly aerated substrates and effective drainage systems. During the budding period, the plant requires a shift to potassium-based fertilizers to ensure the quality of the inflorescences.

Although the species is not strictly photoperiod-dependent, supplementary lighting for up to 16 hours per day promotes faster flowering. Unlike other species, modern varieties of Pelargonium grandiflorum have a high capacity for self-branching, which reduces the need for pinching, while the plant habit is controlled primarily through light regime and specialized growth regulators.

General information about the subject — on the page Container culture.

Sources8

Varieties of Regal 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.