Cultivation

Container cultivation of kohuhu, tawhiwhi

Pittosporum tenuifolium Gaertn.

Growing Pittosporum tenuifolium in containers requires the use of compact cultivars, strict drainage control to prevent root rot, and ensuring protection of the root system from freezing during the winter period.

In the reference 8 varieties crop Kohuhu, where this is mentioned in the description.

For container cultivation of Pittosporum tenuifolium, dwarf cultivars such as 'Golf Ball', 'Tom Thumb', and 'Silver Queen' are preferred, as they allow for limiting root system development and the dimensions of the aerial part. Given the plant's high sensitivity to waterlogging, it is critical to use pots with drainage holes and a mandatory layer of expanded clay or gravel at the bottom.

The substrate must ensure efficient water drainage while maintaining moderate moisture levels. In containers, the plant requires regular watering, especially during the summer, although the risk of overwatering remains high. Repotting into larger containers is carried out every 2–3 years as the roots occupy the substrate.

Overwintering requires special conditions: due to the limited cold hardiness of the root system in container conditions, plants must be moved to protected, unheated greenhouses or provided with reliable insulation for both the container and the canopy in regions with low temperatures.

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

Sources8

Varieties of Kohuhu 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.