Temperature

written on Oct 15, 2017

Haworthias grow best in a subtropical climate that has warm days (20~26° C) and cool nights (10~16° C) in spring and fall. In such weather conditions, they reach the peak growth, actively absorbing water and nutrients. Various propagation (for example, germinating seeds) and care (for example, applying systemic insecticide) are best done during these periods.

In winter, Haworthias prefer days between 14° and 25° C with nights between 4° and 10° C. If temperatures fall below 4° C, they slow down growth and may even suffer from freezing injury. In summer, they prefer days between 25° and 38° C with nights between 14° and 20° C. When overnight temperatures go above 24° C, plants will gradually enter dormancy because high temperatures can inhibit their collection of carbon dioxide for photosynthesis. During these periods, water supply should be reduced or even stopped to avoid rotting.

A thermometer that records daily high and low temperatures is useful for deciding the timing of watering and other activities.
A thermometer that records daily high and low temperatures is useful for deciding the timing of watering and other activities.