Fertilising a Ilex crenata 'Convexa'
Fertilizing this species should be done with care to ensure the plant maintains its lush, evergreen appearance and supports its modest growth rate. Apply a balanced, slow-release fertilizer in early spring to encourage vibrant foliage and healthy development throughout the growing season. It's important to follow the manufacturer's instructions to avoid over-fertilization, which can lead to excessive growth and potential vulnerability to winter damage.
Given its winter hardiness, ranging from -17.8°C to -23.3°C, and corresponding to USDA zone 6, it's crucial to cease fertilizing by late summer to allow the Japanese holly 'Convexa' to harden off before the cold season. This timing helps ensure that the plant enters dormancy properly, fortified against the winter conditions.