The Cultivation Method of Malva Rotundifolia
When growing ornamental plants on the balcony, Malva rotundifolia is deeply loved for its fluffy flower balls and heart-shaped leaves. Although this plant, native to the Mediterranean, is adaptable, scientific care methods can make it display a fuller flower shape and a longer viewing period.
Three Elements of Environmental Control
Soil Mixture Selection
It is recommended to use a mixed matrix of decomposed leaf soil + coarse sand + perlite (5:3:2) to ensure drainage while retaining an appropriate amount of nutrients. Loosen the soil once a month in spring and autumn, and replace the top 5cm of soil in pot plants every 2 years.
Temperature Adaptation Range
The plant grows best at 15-28°C, and needs to be shaded and ventilated when the temperature exceeds 35°C in summer. Maintain above 5°C in winter for safe overwintering, and it is recommended to keep it indoors in northern regions.
Light Demand Cycle
Except for shading 30% during the midday of summer, ensure 4 hours of direct sunlight + 3 hours of scattered light every day in other seasons. When caring for it on a south-facing windowsill, rotate the pot 180° weekly to ensure even light exposure.
Water and Fertilizer Management Points
Watering Frequency Control
Water once every 5-7 days in spring and autumn, thoroughly water every 3 days in summer, and extend to 10-15 days in winter. Use the bamboo stake test: insert the bamboo stake 2/3 into the soil, and water when there is no moist trace when pulled out.
Fertilizing Stage Management
Apply a balanced fertilizer (15-15-15) during the March sprouting period, switch to a high-phosphorus fertilizer (10-30-20) during the May budding period. Apply slow-release organic fertilizer in September and stop fertilizing in winter.
Shaping and Pruning Techniques
Best Time for Pruning
Immediately cut off the residual flower branches after flowering, leaving 2-3 buds at the base. When thinning dense branches in early spring, leave a 45° angle on the main branches, with the cut surface 0.5cm away from the bud.
Disease and Pest Prevention
Spray the back of the leaves with garlic extract (1:50) monthly to prevent red spider mites, and sprinkle diatomaceous earth before the plum rain season to prevent root rot. If aphids are found, apply 75% alcohol with a cotton swab.
By regularly rotating the pot direction, controlling the rhythm of watering and fertilizing, and timely pruning of residual branches, Malva rotundifolia can maintain a compact plant shape and extend the flowering period. It is recommended to create a care calendar based on seasonal changes, recording each pruning and fertilizing time to gradually master the plant's growth patterns.