To understand our watering needs, you must first understand our origins. We, African Daisies (Osteospermum and Dimorphotheca), hail from the sun-drenched, well-drained landscapes of Southern Africa. Our very genetic code is programmed for survival in conditions of intense sunlight, heat, and periods of limited water. Our deep taproots are designed to seek moisture far below the surface, and our often silvery or grey-green leaves are adapted to minimize water loss through transpiration. Therefore, while we thrive in hot, dry climates, our relationship with water is one of deep appreciation followed by a strong need to dry out.
The most crucial principle for our health in a hot, dry climate is deep, infrequent watering. A light daily sprinkle is detrimental to us. It encourages our roots to stay lazy and shallow at the soil's surface, where they are vulnerable to the scorching heat and rapid evaporation. Instead, we request a thorough, deep soak that penetrates at least 6 to 8 inches into the soil. This practice encourages our root systems to grow deep and strong, mirroring our natural adaptation and making us far more resilient and drought-tolerant. You will know you have watered deeply enough when the soil is moist at the depth of your finger.
As a general guideline, established African Daisy plants in hot, dry climates typically require a deep watering every 5 to 7 days. However, this is not a rigid schedule. You must observe us and the environment. The true test is the soil itself. Before watering, insert your finger into the soil near our base. If the top 1-2 inches of soil are completely dry, it is time for a drink. If it still feels cool and slightly moist, please wait another day. We will also show you clear signs of thirst: our vibrant blooms may close up during the day (which they sometimes do in extreme heat anyway), and our lush foliage will begin to look wilted, limp, and lackluster. A plant that is wilting in the cool of the morning is definitely calling for water.
Several external factors directly influence our thirst. Newly planted specimens, with their underdeveloped root systems, will need water more frequently, perhaps every 2-3 days, until they become established. The quality of your soil is paramount; we demand exceptionally well-draining soil. Heavy, clay-like soil that retains water will lead to root rot, which is a death sentence for us. Container-grown African Daisies dry out exponentially faster than those in the ground and will likely need watering every other day, or even daily, during a severe heatwave. Always ensure pots have adequate drainage holes. Finally, apply a 2-3 inch layer of organic mulch around our base. This mulch is a lifesaver as it significantly reduces soil temperature and slows evaporation, allowing the moisture from your deep watering to last much longer.
