Fertilising a Mandevilla sanderi
To ensure the Mandevilla sanderi thrives and produces its captivating red blooms throughout its flowering months, a consistent fertilizing schedule is key. Starting in the spring and continuing through the end of summer, a bi-weekly application of a balanced, water-soluble fertilizer is recommended. This will support vigorous growth and the development of the plant's distinctive pyramid shape.
The species prefers moderate water, so it is crucial to water the plant after fertilizing to help dissolve the nutrients and make them available to the roots. During the winter months, when growth slows and the plant enters dormancy, especially in areas where temperatures align with USDA zone 10b, reduce fertilizing to prevent the accumulation of excess salts in the soil which could potentially damage the root system.