Troubleshooting
Large-Leaf Primulina problems — and how to fix them
Large-Leaf Primulina (Primulina grandifolia) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crown rot
Caused by water pooling in the centre of the rosette or excessively wet compost. Water from below by setting the pot in water briefly, then drain; never pour water directly into the crown.
Leaf tip browning
Caused by hard water, fluoride, or very dry air. Use filtered or rainwater and maintain moderate humidity.
Failure to flower
Insufficient light is the most common cause. Move to a brighter position or provide supplemental LED grow lighting for 12-14 hours per day.
Mealybugs
Hide in the textured leaf corrugations. Inspect carefully; treat with isopropyl alcohol on a cotton bud and neem oil spray, accessing all parts of the leaf surface.
Soggy, collapse growth
Overwatering in poor-draining mix. Repot immediately into a gritty, fast-draining mix and allow to dry slightly before resuming watering.
Prevent large-leaf primulina problems before they start
Most large-leaf primulina issues are care-mismatch, not bad luck. Dial in the basics:
Large-Leaf Primulina problems — FAQ
Why is my large-leaf primulina crown rot?
Caused by water pooling in the centre of the rosette or excessively wet compost. Water from below by setting the pot in water briefly, then drain; never pour water directly into the crown.
Why is my large-leaf primulina leaf tip browning?
Caused by hard water, fluoride, or very dry air. Use filtered or rainwater and maintain moderate humidity.
Why is my large-leaf primulina failure to flower?
Insufficient light is the most common cause. Move to a brighter position or provide supplemental LED grow lighting for 12-14 hours per day.
Why is my large-leaf primulina mealybugs?
Hide in the textured leaf corrugations. Inspect carefully; treat with isopropyl alcohol on a cotton bud and neem oil spray, accessing all parts of the leaf surface.
Why is my large-leaf primulina soggy, collapse growth?
Overwatering in poor-draining mix. Repot immediately into a gritty, fast-draining mix and allow to dry slightly before resuming watering.