Clerodendrum thomsoniae

bright indirect light (3-6 feet from a south or west window, or right next to an east window. Under a grow light, 6-10 inches away works well) with some direct morning sun is ideal for reliable blooming. An east or west-facing window works well. Too little light results in leggy growth and no flowers. Avoid intense afternoon sun that scorches the foliage.

Prefers high humidity (60-80%. Group your plants together, set them on a pebble tray with water, or run a humidifier nearby) - aim for 60% or above. This is genuinely important: low humidity causes bud drop and poor bloom development. A pebble tray or cool-mist humidifier is the most effective approach. Using a humidity gauge rather than guessing is worthwhile for this plant.

Fertile, humus-rich, well-drained potting mix with slightly acidic pH (6.0-6.5). A blend of peat, perlite, and vermiculite works well for container growing. Avoid heavy or compacted soil. Good drainage is essential.

Mealybugs and spider mites in dry conditions. Bud drop before opening is a humidity alarm - increase moisture immediately. Root rot from overwatering. The vine blooms on new growth, so regular pruning after each bloom period is necessary to keep flowers coming. Without pruning, it becomes woody and sparse.