Exposure to hot, dry winds may damage the trees, even if irrigated. Soils, drainage and salinity Grows best on deep, well-drained fertile soils such as loam or sandy loam. Grows poorly on shallow soils and shallow duplex soils. If waterlogged, even for periods as short as a few days, paulownia defoliates and may die. At least 1.5 metres of well-drained soil above the water table is recommended.
Growth is retarded by saline soil or water.
Fertiliser Large amounts of NPK fertiliser are needed for young trees, to produce rapid growth and a tall, straight stem in the early years. Once established, the trees may need less fertiliser, depending on the fertility of the site and the desired growth rate. Minor elements may need to be applied. There is little information available for Australia. In Asia, paulownia is affected by many pests and disease, including anthracnose, mistletoe and insect attack.