Alocasia watsoniana, commonly known as Watson's Alocasia, is a striking tropical plant appreciated for its large, arrow-shaped leaves and dramatic appearance. Here are some key points about this plant:
Light
Accustomed to the dappled light of the rainforest understory, Alocasia watsoniana does best with bright indirect light. Avoid exposure to direct sunlight as it is susceptible to leaf burn. Ensure that you rotate your plant regularly to keep the growth even on all sides.
Soil
Alocasia watsoniana need a chunky, well-draining potting mix. A soilless mixture of equal parts coco coir, perlite, and orchid bark is ideal, but you can also substitute the coco coir for a sandy potting soil. Avoid using straight potting soil as the plant is more likely to suffer from root rot in a dense medium.
Water
Alocasia watsoniana requires regular watering and soil should not be allowed to dry out. That being said, it is more tolerant of missing the occasional watering than some other varieties of alocasia. Allow the top 1 to 2 inches of soil to dry out between waterings and then water thoroughly.
If you are growing your Alocasia watsoniana in a soilless potting mix it is best to bottom-water the plant. Place it in a small container or bowl filled with water and leave it to soak for 10 to 15 minutes. Let the excess water drain from the pot before returning it to its original location.
Temperature and Humidity
Like most alocasias, Alocasia watsoniana thrives in high humidity—60% to 80% humidity is ideal. It does well in terrariums or mini-greenhouses, or with a small humidifier placed nearby.
They do well in typical indoor temperatures from 55 to 80°F. Be aware that consistent exposure to low temperatures may cause the plant to enter dormancy.
Fertilizer
Alocasias are considered heavy feeders and the Alocasia watsoniana is no exception. In addition to a potting mix that has plenty of organic materials, the dragon scale alocasia appreciates regular fertilizing during the spring and summer months.
These aroids grow naturally on limestone outcrops in Borneo and grow best in calcium-rich, slightly alkaline conditions. Amending your potting mix with calcium carbonate or another calcium-rich fertilizer like bone meal will provide your dragon scale with the conditions it loves. It is also recommended that you feed your dragon scale alocasia with a balanced liquid fertilizer once or twice a month during the growing season.