Bleeding glory-bower Care (Clerodendrum thomsoniae)

Clerodendrum thomsoniae performs best in bright, indirect light with some gentle direct sun.

• Provide 4–6 hours of morning sun or filtered light daily; avoid strong midday sun that can scorch leaves and fade Bleeding glory-bower flowers.
• Outdoors, place in light dappled shade under taller plants; indoors, set near an east- or bright north-facing window with sheer curtains.
• In winter, move closer to the brightest window or supplement with grow lights if stems stretch and leaves lose color, indicating low light.

Clerodendrum thomsoniae prefers evenly moist, well-drained soil that never stays soggy.

• Water when the top 2–4 cm of soil feel dry, using enough water to moisten the whole root zone, then let excess drain away completely.
• Reduce watering in cooler months when growth slows, allowing the soil to dry slightly deeper while still preventing total dryness or leaf wilt.
• Watch for yellowing, soft leaves or a sour smell as signs of overwatering, and crisp leaf edges or drooping, dry stems as signs of underwatering.

This species grows best in warm, stable conditions without cold drafts or sudden temperature swings.

• Aim for 65–80°F (18–27°C) during active growth, which supports flowering and healthy foliage development.
• Protect from temperatures below 50°F (10°C), as light frost can damage stems and leaves and prolonged cold may kill the plant.
• In hot periods above 86°F (30°C), provide extra shade, good airflow, and closer monitoring of soil moisture to prevent heat stress.

This species benefits from moderately high, consistent humidity for best leaf health and flowering.

• Aim for 50–60% humidity; it tolerates short dips lower but prolonged air below 40% often leads to leaf edge browning.
• Dry indoor air causes curling leaves, crispy tips, and stalled buds in Bleeding glory-bower.
• Increase humidity with a pebble tray under the pot or grouping plants, but avoid misting foliage heavily to reduce fungal risk.

Clerodendrum thomsoniae prefers an airy, moisture-retentive yet sharply draining substrate.

• Use a loose, loamy mix of roughly 50% peat or coco coir, 30% compost, and 20% perlite or bark for structure and drainage.
• Keep pH slightly acidic to neutral, around 6.0–7.0, to support nutrient availability and root function.
• Improve aeration by adding extra perlite or fine bark if the mix feels heavy or compacts after watering.
• Avoid dense garden soil, unamended clay, or constantly soggy mixes that promote root rot and poor growth.

This vine is well suited to container growing when the pot supports its vigorous, climbing habit.

• Choose a relatively deep, heavy pot to counterbalance climbing growth and prevent tipping once the plant is trained on a support.
• Select containers with large, unobstructed drainage holes so water exits quickly and the lower root zone does not stay saturated.
• Use a slightly wider pot than the current root spread to allow lateral root expansion without creating a large volume of unused, wet mix.

Clerodendrum thomsoniae benefits from consistent feeding during its active growing season for strong growth and flowering.

• Use a balanced liquid fertilizer (e.g., 10-10-10 or 20-20-20) diluted to 1/2 strength every 2–4 weeks in spring and summer.
• Alternatively, top-dress with a thin layer of compost or use a slow-release fertilizer at the start of the growing season.
• Suspend or greatly reduce feeding in fall and winter when growth slows, especially for Bleeding glory-bower kept indoors.
• Always water before applying liquid fertilizer to reduce the risk of root burn and salt buildup.

Clerodendrum thomsoniae responds well to thoughtful pruning that maintains shape and encourages blooming wood.

• Carry out main pruning in late winter or very early spring before strong new growth begins.
• Remove dead, damaged, or crossing stems first, then thin crowded interior shoots to improve light and air flow.
• Shorten long, leggy stems by 1/3–1/2 to keep a compact form and stimulate new flowering shoots.
• Use clean, sharp hand pruners, making angled cuts just above healthy outward-facing buds.

This plant grows vigorously in containers and benefits from periodic repotting to refresh soil and support root health.

• Check for roots circling the pot, emerging from drainage holes, or slowed top growth as signs it needs a larger container.
• Plan to repot every 2–3 years in late winter or early spring, just before the main flush of new growth.
• Move to a pot 1–2 in wider with fresh, well-draining mix, keeping the root ball at the same planting depth.
• Gently loosen circling roots, water thoroughly after repotting, and keep in bright, indirect light for 1–2 weeks to limit stress.

Clerodendrum thomsoniae is most commonly propagated from softwood or semi-ripe stem cuttings taken during the warm season.

• Take 8–12 cm cuttings in late spring or summer from non-flowering shoots, removing lower leaves.
• Dip the cut end in rooting hormone to improve root formation and reduce rot risk.
• Insert cuttings into a moist, well-draining medium such as perlite and peat or a fine seed-starting mix.
• Provide bottom warmth around 70–75°F, bright indirect light, and high humidity until roots form in several weeks.

This tropical species is frost sensitive and needs protective winter care in most temperate climates.

• In USDA zones colder than 10, grow Clerodendrum thomsoniae in containers and move indoors before temperatures drop below 50°F.
• Overwinter indoors in bright, indirect light with temperatures around 60–70°F and reduced watering.
• In mild climates, mulch the root zone with 5–8 cm of organic material to moderate soil temperature.