Plant Profile & Key Characteristics
Overview: A twining evergreen climber reaching 2-4 m, famous for flowers with pure-white inflated calyces and contrasting crimson corollas — the classic “bleeding heart”. It is evergreen in warm climates and popular as a trellis, container and conservatory plant.
Quick Specifications
| Specification | Attribute |
|---|---|
| Plant Type / Life Cycle | Perennial (evergreen to deciduous vine) |
| Foliage Type | Evergreen in warm climates; deciduous where cool |
| Mature Size | 2-4 m (6-12 ft) |
| Growth Rate | Fast to moderate |
| Hardiness | USDA zone 10b+ |
Growth Form & Structure
- Height & Spread: 2-4 m (6-12 ft) on a support; container- or conservatory-growable in warm rooms
- Growth Habit & Form: Twining evergreen vine that needs a trellis or support
- Lifespan & Maturity: Fast-establishing flowering plant reaching size within a couple of seasons
Anatomy & Physical Features
- Leaves & Foliage: Green to dark-green ovate leaves
- Flower Characteristics: Clusters of flowers with pure-white inflated calyces and contrasting crimson-red corollas — the classic “bleeding heart”
Primary Uses & Landscape Value
- Functional & Ornamental Roles: Popular ornamental flowering climber for trellises, containers and conservatories; also a hedge or screen
Care Guide: Planting, Soil & Watering
Overview: Clerodendrum thomsoniae (bleeding-heart vine) is a fast-to-moderate evergreen climber for warm climates (hardy to about zone 10b) grown in full sun to half shade. It needs rich, well-draining soil kept consistently moist and a support to climb.
Quick Care Requirements
| Requirement | Ideal Condition |
|---|---|
| Planting Season | Spring–summer in zone 10b, spring–autumn in 11, year-round in 12+ |
| Growth Rate | Moderate to Fast |
| Soil Type | Rich, moisture-retentive yet well-draining |
| Water Need | Moderate to High – keep the soil moist |
Planting & Establishment
- Best Planting Season: Plant in spring to summer in zone 10b, spring to autumn in 11, and year-round in zone 12+.
- How to Plant:
- Hole Preparation: Dig a hole larger than the root ball.
- Soil Amendments: Mix in organic matter, chopped dead leaves and humus.
- Planting Depth: Set the plant in and cover it lightly, keeping the root collar at soil level.
- Growth Speed & Expectations: Fast to moderate, climbing 2–4 m (6–12 ft); train it onto a trellis or support.
Soil, Watering & Drainage Care
- Soil Mix & Drainage Needs: Use soil that holds moisture without staying waterlogged, and mulch to keep roots cool and moist; in pots use potting mix or peat with perlite and refresh it every few years as drainage declines.
- Watering Schedule & Technique:
- Young / Newly Planted: Keep the soil moist for the first few weeks until the plant establishes.
- Established: Water regularly so the soil never fully dries; these plants like an average-to-generous supply.
- Seasonal Adjustments: Increase in summer heat; reduce in cooler months.
Note: Best grown in a container, since named cultivars are propagated by grafting or cuttings rather than seed; if planting in the ground, allow about 1-2m (3-6ft) between plants.
Climate, Light & Hardiness
Clerodendrum thomsoniae is a tropical, twining flowering vine that needs consistently warm conditions and grows best in full sun to half shade with something to climb on. It is reliably hardy outdoors only in USDA zone 10b and warmer, and as a true tropical it has essentially no frost tolerance.
Quick Climate Specifications
| Climate Zones | Tropical, subtropical, Mediterranean |
|---|---|
| USDA Hardiness Zones | 10b+ |
| Optimal Temp Range | Generally warm, broadly 21–25°C (70–77°F) and above during active growth |
| Approx. Survival Minimum | Not documented precisely, but as a zone 10b+ tropical species it is unlikely to tolerate any frost; treat 0°C (32°F) as an approximate outdoor danger threshold |
| Frost Tolerance | Very Low |
| Light Conditions | Full Sun to Half Shade |
| Wind Tolerance | Low to Moderate |
Sunlight & Light Exposure
Optimal Light Setup
Full sun to half shade, with a trellis, fence, or other support since it is a twining climber.
Direct Sun Requirement
Tolerates full sun in humid tropical or subtropical climates; in hotter, drier Mediterranean-type conditions, half shade helps prevent leaf and flower scorch.
Shade & Heat Management
Provide some afternoon shade in intense, dry heat to protect the delicate white-and-red flower clusters.
Best Exposure / Orientation
A warm, sheltered wall or trellis in full sun to half shade is ideal, taking advantage of a support structure for its climbing habit.
Temperature Extremes & Hardiness
USDA Hardiness & Regional Limits
Outdoor-hardy only in zone 10b and warmer per site data; in cooler climates it must be grown as a container plant that is moved under cover for winter.
Cold Damage & Winter Protection
Keep well above freezing; container specimens should come indoors before the first frost, and even brief cold snaps can cause significant leaf drop or dieback.
Frost Sensitivity
Very low – a genuine tropical to subtropical species with little to no frost tolerance.
Extreme Heat Tolerance
Generally good in humid warmth, but very hot, dry conditions call for afternoon shade and reliable moisture, matching the rich, well-drained, evenly moist soil the site data recommends.
Wind, Humidity & Microclimate
Humidity Preferences
High – native to humid tropical Africa; benefits from consistently humid air, especially indoors or in dry climates.
Dry-Air Tolerance
Low – dry air, including indoor heating in winter, can cause bud and flower drop.
Wind Tolerance
Low to moderate; as a twining vine on a support structure, a sheltered position reduces wind stress and stem breakage.
Rainfall & Seasonal Moisture
Prefers consistently moist, humid conditions rather than a pronounced dry season; avoid letting the root zone dry out for extended periods.
Microclimate Recommendations
A warm, humid, wind-sheltered spot with a trellis or support and some protection from the most intense midday sun suits it best.
Growing in Pots, Balconies & Indoors
Bleeding-heart vine (Clerodendrum thomsoniae) is a twining flowering climber reaching 2-4 m (6-12 ft). The grower does not list it as a houseplant, but this popular vine can be kept indoors near a bright, sunny window with support – treat it as a windowsill/sunroom plant; it flowers best with good light and room to climb, and excels in a large patio container.
Quick Details
- Container Size: A pot 100-200% larger than the root ball, or a smaller pot if you trim the roots at planting
- Indoor Suitability: Not the grower’s pick as a houseplant, but it can grow by a bright, sunny window with support
- Best Spot: Full sun to half shade; the more light, the better the flowering
- Soil & Drainage: Potting mix or peat with perlite; well-drained, refreshed every few years
- Watering in Pots: Average to plenty in growth – keep it moist but never waterlogged
Indoors & On the Windowsill
- Indoor reality: The grower marks it as not a houseplant – it is a vigorous flowering vine. That said, with a very bright, sunny window and a support to climb, a manageable plant can be kept and flowered indoors.
- Flowering: It needs good light and some maturity to bloom well; give it the brightest spot and a trellis or hoop, and prune after flowering to keep it in bounds.
- Overwintering: Tender – keep it warm indoors over cold months; it may drop some leaves and rest in the cooler, darker season, so ease off watering then.
On a Balcony or Patio
- Light & support: A warm, sunny, sheltered balcony or patio is ideal; give it a trellis or railing to twine up. Shelter the soft new growth from strong wind.
- Practicalities: It is a strong grower – a large, stable pot and regular pruning keep it tidy; pots dry fast in sun, so check moisture in warm weather.
Choosing the Pot, Soil & Long-Term Care
- Pot & drainage: Choose a pot 100-200% larger than the root ball, or use a smaller pot and trim the roots when planting. Strong drainage holes; skip a standing-water saucer.
- Potting mix: Potting mix or peat with perlite; note that after a few years the mix drains less well, so replace it with fresh.
- Feeding: When potted, add organic matter and feed at least once a year – potted plants leach nutrients faster than those in the ground.
- Repotting: Every few years refresh the soil (and pot up or root-prune as needed) to restore drainage and vigour.
Fertilizing & Feeding
A moderate feeder: this fast-growing climbing or hedging vine benefits from balanced feeding through its active growing season, paired with organic matter worked into rich soil, to support both foliage and its clustered white-and-red blooms.
Quick Fertilizing Specs
| Feeding Level | Moderate feeder |
|---|---|
| Main Nutrient Priority | Balanced feeding with adequate nitrogen for vigorous climbing growth |
| Best Feeding Period | Through the warm active growing season |
| Organic Options | Organic matter, chopped leaves, and humus worked into rich, well-drained soil |
Feeding by Growth Stage
Establishment after planting
Help a newly planted vine root in and begin climbing or filling out as a hedge.
| Nutrient direction | A light, balanced feeding with organic matter supports root establishment without forcing too much soft top growth right away. |
|---|---|
| Timing | At planting and through the following weeks as roots establish. |
| Frequency | A single light feeding at planting is usually enough to start the vine off well. |
| Fertilizer types | A balanced general-purpose fertilizer at a light rate, Organic matter and humus worked into the planting hole |
| Precautions | Keep the soil consistently moist while roots establish; this vine does not tolerate drying out at this stage. |
Active climbing growth
Support the vine’s fast to medium climbing growth as it fills its trellis or hedge space.
| Nutrient direction | A balanced fertilizer with adequate nitrogen fuels the vigorous vining growth this plant is known for. |
|---|---|
| Timing | Through the warm active growing season. |
| Frequency | Several light feedings through the growing season support steady growth. |
| Fertilizer types | A balanced complete fertilizer, A top-dressing of organic matter to keep soil rich and moist |
| Precautions | Provide support such as trellising to match the vine’s vigorous growth; overfeeding without adequate support can lead to a tangled, top-heavy plant. |
Bloom support
Support the clustered white-and-red, bowl-shaped flowers through their bloom period.
| Nutrient direction | Continue balanced feeding with adequate nitrogen; a high-phosphorus product is not needed to drive bloom. |
|---|---|
| Timing | During the spring to summer bloom period. |
| Frequency | A light feeding as flowering begins is usually enough to support the bloom cycle. |
| Fertilizer types | A balanced complete fertilizer at a light rate |
| Precautions | Ease feeding back after bloom finishes so growth doesn’t stay soft heading into cooler weather or the pruning season. |
Nutrient Deficiency Signs & Corrections
Older, lower leaves fade to pale green or yellow and climbing growth slows noticeably.
| Possible causes | low available soil nitrogen, soil low in organic matter, root competition in a crowded planting or container |
|---|---|
| Appears first on | older, lower leaves |
| What to check | soil organic matter, recent feeding history, root crowding or container size |
| Possible correction | Apply a balanced fertilizer and refresh organic matter in the soil, then watch for greener, more vigorous regrowth. |
New leaves emerge yellow while the veins remain green.
| Possible causes | soil pH too high for good iron availability, waterlogged or compacted soil limiting root uptake, cool temperatures temporarily slowing nutrient uptake in this tropical vine |
|---|---|
| Appears first on | newest leaves at the growing tips |
| What to check | soil pH and drainage, watering consistency, recent temperature conditions |
| Possible correction | Improve drainage, correct pH toward neutral where practical, or apply a chelated iron product per its label. |
Leaf margins brown or scorch, especially in containers, despite adequate watering.
| Possible causes | fertilizer salt buildup from overfeeding, inconsistent watering that concentrates salts, poor drainage in a container |
|---|---|
| Appears first on | leaf margins and tips |
| What to check | recent feeding amounts, container drainage, watering consistency |
| Possible correction | Ease off feeding, water thoroughly to flush accumulated salts, and return to lighter feeding afterward. |
Pruning, Training & Seasonal Maintenance
Clerodendrum thomsoniae (Bleeding-heart vine) is a fast, twining vine that needs a trellis or other support and tolerates a moderate-to-high level of pruning. Its own care notes call for one main structural/design prune a year, done after flowering finishes – into autumn or early winter depending on exactly when the plant blooms – to remove dead and weak growth and control its size on the support. Because flowers form on new growth produced after this cut, the timing doesn’t cost the current display and instead builds the wood that will carry next season’s bloom.
Quick Pruning & Maintenance Specs
| Pruning Tolerance | Moderate – High |
| Primary Pruning Window | After flowering, into Autumn – early Winter (timing varies with bloom) |
| Secondary Maintenance Window | Light shaping and tie-in adjustments through the growing season |
| Typical Frequency | 1 main structural prune per year, plus ongoing training |
| Main Objective | Control size/shape on its support; remove dead and weak growth |
| Young Plant Priority | Train leading shoots onto the trellis/support; minimal cutting |
| Mature Plant Priority | Annual cutback for shape, remove dead/weak/crossing growth |
| Best Tool Type | Bypass secateurs (loppers for thicker old stems) |
| Avoid Heavy Pruning During | Active spring – summer bloom |
Pruning by Plant Age & Size
Newly Established
Focus on tying and training young stems onto the trellis or support rather than cutting; remove only damaged growth.
Young / Formative
Trellis training suits this twining vine habit: select and tie in main climbing stems, and pinch lateral tips to encourage bushier, more floriferous side growth.
Mature / Established
Annual after-bloom prune to control size and shape, remove dead and weak (“week”) branches, and thin crowded growth on the support.
Seasonal Pruning Schedule
Post-Flowering
Objective: reset the vine for the next cycle and keep it within its support’s footprint.
Remove: dead and weak/spindly branches, spent flowering shoots, overly long or wayward growth.
Do not remove: healthy vigorous stems needed to rebuild the framework on the trellis.
Expected response: fresh flowering laterals through the following spring – summer.
Flowering/fruiting impact: since flowers form on new growth, this timing maximizes next season’s bloom rather than cutting it off.
Ongoing Sanitary
Monitor for aphids, spider mites and mealybugs, and remove visibly pest-damaged growth as needed through the season.
Flowering & Fruiting Wood
This vine flowers on the current season’s new growth rather than on older persistent wood. Pruning immediately after the current bloom – rather than mid-season or right before/during flowering – avoids removing developing flower buds and gives the longest possible window for new wood to mature and flower the next cycle. A hard prune delays bloom while the vine first rebuilds vegetative growth.
Structural Pruning & Training
As a twining vine on a trellis: select and retain the main climbing stems, remove crossing or rubbing growth that tangles on the support, control height and spread to the trellis’s footprint, and thin dense growth so light reaches the inner flowering laterals.
Special Growth to Remove
- Dead branches.
- Weak or spindly stems.
- Overly long, unsupported trailing shoots that aren’t tied in and risk tangling or snapping.
Not a grafted plant, so there is no rootstock-sucker concern.
Container & Small-Space Pruning
This vine can be grown in a container, but at 2–4m it is vigorous for a pot-and-trellis setup. Prune harder and more often to keep it in proportion to a smaller support; without regular size control it will quickly outgrow a container.
Tools
Bypass secateurs for most stems; loppers for thicker, older basal growth on a mature specimen; soft ties or stakes for training new growth onto its trellis or support.
Tool Hygiene & Disease Risk
Increased. Aphids, spider mites and mealybugs are all present and can be carried between plants on tools or hands; clean tools between plants, especially when removing pest-infested growth.
Cut Placement & Technique
Cut dead or weak stems back to a healthy node or the main stem, avoiding flush cuts into the framework. Tie new leading shoots loosely to the support to avoid girdling as the stems thicken.
Heavy Pruning & Rejuvenation
Moderate-to-high tolerance – an overgrown or leggy vine can be cut back hard after flowering to renew its framework on the trellis. Expect vigorous regrowth and a temporary reduction in flowering the following cycle while it rebuilds; spread a very hard rejuvenation of an old, heavily tangled specimen over two seasons rather than doing it all at once.
Post-Pruning Care
Retie remaining and new growth to the support after cutting back. Watch for a flush of aphids or mealybugs on tender regrowth. Water normally; the plant’s own care notes already call for fertilizing once a year, so no extra feeding is needed purely for pruning recovery.
Common Pruning Mistakes
- Pruning during active spring – summer bloom, sacrificing the current flower display.
- Leaving cut stems untied so new growth flops instead of climbing.
- Letting the vine outgrow its support before the annual prune, forcing a much harder cutback than necessary.
When NOT to Prune
Avoid pruning during active flowering (spring – summer), and avoid a hard cutback right after transplanting while the vine is establishing on new support.
Recommended Tools (by task)
- Bypass secateurs – most of the annual cutback and thinning cuts on pencil-to-finger-thick stems.
- Loppers – thicker, older basal growth on a mature vine.
- Soft ties/stakes – training and securing climbing stems to the trellis or support.
Pruning Troubleshooting
| Problem | Possible Cause | What to Check | Corrective Action |
| Poor flowering after pruning | Pruned too late or during bud formation | Timing relative to the bloom cycle | Prune only after flowering finishes, not mid-bloom |
| Legginess / bare base | Insufficient annual cutback or too little light | Pruning frequency and light exposure on the support | Prune harder annually and ensure the support gets good light |
| Tangled, unsupported growth | Shoots not tied in as they grew | Trellis attachment and tie-in frequency | Retie growth promptly and prune wayward shoots |
| Pest buildup on new growth | Aphids/mealybugs favor tender regrowth after pruning | Inspect fresh shoots after cutback | Treat pests promptly; avoid over-fertilizing, which pushes soft growth |
Propagation Guide
Clerodendrum thomsoniae can be propagated vegetatively from stem cuttings. Seed is also possible where viable seed is produced and is appropriate for the species or genus-level plant.
Quick Propagation Specs
| Best Vegetative Method | Stem cuttings |
| Seed | Possible where viable seed is produced |
| Grafting | Not required |
Cuttings root best in early spring at around 21-25°C (70-77°F), in moist, humid conditions using a peat-based mix and a rooting hormone; a greenhouse or a small perforated plastic box helps hold humidity, and the first roots typically take a few weeks to form. For seed, a peat mix with vermiculite (or another well-ventilated medium) in a sunny, humid spot at the same 21-25°C range works well.
Stem Cuttings
Take healthy non-flowering stem material with viable nodes. Remove lower leaves, place the cutting in a clean, free-draining propagation medium, and maintain humidity without keeping the medium waterlogged until roots develop.
Growing from Seed
Use mature, viable seed when seed propagation is desired. Seed-grown plants may vary, especially on cultivated or genus-level pages.
Aftercare
Keep rooted cuttings protected from severe stress while they establish, then increase light and normal watering gradually.
Bloom & Flower Guide
Quick Details
- Bloom Season: Spring to summer
- Flower Appearance: Clusters of flowers with a puffy white calyx from which a red, bowl-shaped corolla emerges – the bleeding-heart look
- Edibility: Ornamental only; the flowers are not eaten and the plant is best kept out of reach of pets and children.
Detailed Blooming Overview
The bleeding-heart vine is grown for its striking two-toned flowers. Each bloom starts with an inflated, lantern-like white calyx, and the red corolla then pushes out through it, so the clusters look like little white hearts dripping red. Flowering runs from spring into summer on this twining, warmth-loving climber.
Flower Characteristics
- Puffy white calyx with a red, bowl-shaped corolla emerging.
- Borne in showy clusters.
Bloom Care & Thinning
- Encouraging flowers: It blooms on new growth, so a prune after the main flush encourages fresh flowering shoots; give warmth, humidity and bright, indirect light.
- Tidying: Remove faded clusters to keep the display fresh.
Bloom Health & Protection
- Whitefly, mealybugs and spider mites: These are the common indoor pests on Clerodendrum, gathering on soft growth and buds; insecticidal soap or neem oil, plus a little added humidity against mites, keeps the flowering shoots healthy.
Pests, Diseases & Troubleshooting
Overview: Bleeding-heart vine and its relatives are classic tender ornamentals that are magnets for whitefly and other greenhouse sap-suckers, which bring sticky honeydew and sooty mold. Keep plants vigorous in bright, humid, airy conditions, inspect leaf undersides often, and treat sap-suckers early with soaps and oils.
Quick Troubleshooting Overview
| Issue / Pest | Main Symptom | Primary Solution |
|---|---|---|
| Whitefly | Clouds of white flies under leaves; sticky honeydew and sooty mold | Yellow sticky traps, insecticidal soap, oil |
| Mealybugs | White cottony masses in leaf axils and stems | Dab with alcohol, insecticidal soap, oil |
| Spider mites | Fine stippling and webbing in warm, dry air | Raise humidity, hose foliage, horticultural oil |
| Aphids | Clustered on soft shoot tips; distorted growth | Water jet, insecticidal soap |
| Scale | Brown or waxy bumps on stems; honeydew | Scrape off, horticultural oil |
| Leaf spot | Brown/black spots and yellowing leaves | Improve airflow, avoid wetting foliage |
Common Pests & Management
- Whitefly (Trialeurodes vaporariorum / Bemisia tabaci):
- Symptoms: Signature pest: tiny white flies rising in clouds when disturbed, with nymphs and honeydew on leaf undersides leading to sooty mold and weakened, yellowing growth.
- Prevention & Control: Yellow sticky traps to monitor; insecticidal soap or horticultural/neem oil to undersides in the evening, repeated to catch hatches; encourage Encarsia parasitic wasps under glass.
- Mealybugs (Planococcus citri / Pseudococcus spp.):
- Symptoms: White cottony tufts wedged in leaf axils, stem joints and undersides, with honeydew and stunted, distorted growth.
- Prevention & Control: Spot-treat with a cotton bud dipped in alcohol; insecticidal soap or oil for wider infestations; isolate new plants and check regularly.
- Two-spotted spider mite (Tetranychus urticae):
- Symptoms: Fine pale stippling, a bronzed dull cast to leaves, and fine webbing beneath in warm, dry indoor air.
- Prevention & Control: Raise humidity and hose or wipe foliage; horticultural or neem oil and insecticidal soap; predatory mites in enclosed spaces.
- Aphids (Aphis spp.):
- Symptoms: Clusters of soft insects on tender shoot tips and buds, causing curling, honeydew and ants.
- Prevention & Control: Dislodge with water, insecticidal soap or oil on heavy colonies; conserve natural predators.
- Soft/brown scale (Coccus hesperidum):
- Symptoms: Flat brown or waxy bumps along stems and leaf veins, with sticky honeydew and sooty mold.
- Prevention & Control: Scrape off light infestations; horticultural oil to smother, repeated; prune out badly encrusted stems.
Diseases & Fungal Issues
- Leaf spot (Cercospora / Phyllosticta):
- Symptoms: Brown to black spots that enlarge and merge, with yellowing and leaf drop in humid, still conditions.
- Treatment & Management: Improve airflow and spacing, avoid overhead watering, remove affected leaves; copper fungicide only if persistent.
- Sooty mold (secondary fungi on honeydew):
- Symptoms: Black sooty film coating leaves and stems wherever sap-suckers have left honeydew, blocking light.
- Treatment & Management: Control the underlying whitefly/scale/mealybug; wipe or wash off the mold once the pests are gone.
- Root rot (Pythium / Phytophthora):
- Symptoms: Wilting, yellowing and collapse from soggy soil; roots dark and mushy.
- Treatment & Management: Use free-draining mix, water only when the surface dries, and never leave pots standing in water.
Growing Difficulties & Abiotic Problems
- Chlorosis / leaf yellowing:
- Cause & Symptoms: Yellowing between veins from high pH, cold, or overwatering locking up iron and magnesium.
- Correction Strategy: Correct watering, feed with a balanced feed plus chelated iron/magnesium, and keep tender types warm.
- Leaf drop & poor bloom:
- Cause & Symptoms: Insufficient light, cold drafts or sudden change causes leaf drop and few flowers on tender species.
- Correction Strategy: Give bright light, steady warmth (avoid drafts) and even moisture; feed in the growing season.
- Sunburn:
- Cause & Symptoms: Scorched, bleached patches when a shade-acclimated plant is moved abruptly into strong sun.
- Correction Strategy: Acclimate gradually and provide light shade in the hottest part of the day.
What Helps – Products & Tools
Lead with cultural control – bright airy conditions, clean foliage, yellow sticky traps and isolating new plants. When needed, insecticidal soap and horticultural/neem oil manage whitefly, mealybug, scale, mites and aphids, and a copper fungicide addresses stubborn leaf spot.
