Plant Profile & Key Characteristics
Overview: A large evergreen tropical aroid 1-5 m (3-16 ft) across, grown for its huge, deeply cut heart-shaped leaves. It is a popular ornamental foliage plant for warm gardens and as an indoor specimen.
Quick Specifications
| Specification | Attribute |
|---|---|
| Plant Type / Life Cycle | Perennial (evergreen aroid) |
| Foliage Type | Evergreen |
| Mature Size | 1-5 m (3-16 ft) tall and wide |
| Growth Rate | Moderate to slow |
| Root System | Produces thick aerial roots (semi-climbing aroid) |
| Toxicity | Toxic if chewed — all parts contain insoluble calcium oxalate crystals that irritate the mouth and skin of people and pets |
| Hardiness | USDA zones 9+; grown as a houseplant elsewhere |
Growth Form & Structure
- Height & Spread: Builds a broad mound up to 1-5 m (3-16 ft) in warm gardens; stays considerably smaller and more restrained in a pot, where it is a favourite indoor foliage plant.
- Growth Habit & Form: Robust self-heading to semi-climbing aroid; a stout stem carries a rosette of very large leaves and sends out thick aerial roots.
- Lifespan & Maturity: A long-lived perennial that grows steadily larger over years, leaves becoming more deeply cut as it matures.
Anatomy & Physical Features
- Leaves & Foliage: Very large glossy green leaves, heart-shaped and deeply cut into finger-like lobes.
- Flower Characteristics: A large white-yellowish spathe with a honeycomb-textured spadix, seldom seen on indoor plants.
Primary Uses & Landscape Value
- Functional & Ornamental Roles: A bold ornamental foliage plant for shaded tropical gardens, large containers and as one of the most popular indoor houseplants.
Care Guide: Planting, Soil & Watering
Overview: This philodendron is a warm-climate aroid that thrives in bright, indirect light in rich, moisture-retentive but well-drained soil. It likes steady moisture and warmth and is sensitive to cold and harsh direct sun. As a climber it appreciates a moss pole or trellis.
Quick Care Requirements
| Requirement | Ideal Condition |
|---|---|
| Planting Season | Spring, summer or autumn in warm conditions; year-round indoors |
| Growth Rate | Slow to moderate |
| Soil Type | Rich, well-draining, moisture-retentive aroid mix |
| Water Need | Moderate to high — keep evenly moist, letting the surface dry slightly |
Planting & Establishment
- Best Planting Season: Plant in spring, summer or autumn during warm weather; indoors it can be potted year-round.
- How to Plant:
- Hole Preparation: Dig a hole about as deep as and a little wider than the root ball, and set a moss pole or trellis for climbing stems.
- Soil Amendments: Enrich the soil with compost and coarse organic matter so it holds moisture yet drains freely and stays airy.
- Planting Depth: Set the root ball level with the surface, keeping the crown and stem base at soil level rather than buried.
- Growth Speed & Expectations: Expect slow-to-moderate growth, reaching 1–5 m in ideal warm, humid conditions.
Soil, Watering & Drainage Care
- Soil Mix & Drainage Needs: Use a chunky, aerated aroid mix (with bark or perlite) that stays moist but drains fast; sharp drainage prevents root rot in the fleshy roots.
- Watering Schedule & Technique:
- Young / Newly Planted: Keep newly planted or potted plants evenly moist in a warm, humid, sheltered spot out of harsh sun.
- Established: Water when the top few cm of soil begin to dry, then water thoroughly and let excess drain away.
- Seasonal Adjustments: Water more in warm active growth and cut back in cool weather; protect from cold, which it resents.
Climate, Light & Hardiness
Philodendron selloum is a large tree philodendron for tropical, subtropical and mild Mediterranean climates and a popular foliage houseplant, growing best in warm, humid, part-shaded conditions. It is cold-sensitive, but at zone 9 it is one of the hardier philodendrons and an established plant tolerates brief light frost.
Quick Climate Specifications
| Climate Zones | Tropical, subtropical, mild Mediterranean; elsewhere a houseplant |
|---|---|
| USDA Hardiness Zones | 9+ (site data) |
| Optimal Temp Range | Approx. 18–30°C (64–86°F) |
| Cold Damage Begins | Below about 10°C (50°F); foliage is damaged by frost |
| Approx. Survival Minimum | Established plants may survive brief light frost near 0°C (32°F); young plants are more sensitive |
| Frost Tolerance | Low |
| Light Conditions | Part to full shade (leaves burn in full sun) |
Sunlight & Light Exposure
Optimal Light Setup
Bright, filtered light or part shade is ideal; although the site lists a range up to full sun, it also notes the plant is sensitive to full sun, which scorches the leaves.
Shade & Heat Management
In hot climates give it shade during the harshest midday sun; dappled light keeps the big divided leaves lush.
Best Exposure / Orientation
Indoors, near a bright window out of direct sun; outdoors, an east-facing or tree-shaded position.
Temperature Extremes & Hardiness
USDA Hardiness & Regional Limits
Site data rates it hardy to zone 9, notably tougher than most tropical philodendrons. Cold tolerance still varies with plant age, exposure duration and conditions.
Cold Damage & Winter Protection
Growth stops below about 10°C (50°F), and frost marks the foliage; an established plant recovers from brief light frost, while young plants need covering and mulch. A warm, sheltered site improves overwintering at the cold margin.
Frost Sensitivity
Low - the site flags it as sensitive to cold, but it endures more than the strictly tropical philodendrons.
Extreme Heat Tolerance
Good in warm, humid heat with shade and moisture; hot direct sun scorches the leaves.
Wind, Humidity & Microclimate
Humidity Preferences
Prefers moderate to high humidity for the lushest foliage.
Dry-Air Tolerance
Moderate; dry air browns leaf edges but is tolerated better than by tender aroids.
Wind Tolerance
Low to moderate; the large leaves tear in strong wind, so give it some shelter.
Microclimate Recommendations
A warm, humid, sheltered, part-shaded spot suits it best; young plants especially benefit from frost protection.
Growing in Pots, Balconies & Indoors
Selloum, the tree philodendron, is a very popular houseplant grown for its big, deeply lobed leaves – the grower confirms it for both indoors and pots. It forms a broad, leafy specimen in a large container.
Quick Details
- Container Size: A large, sturdy pot – it spreads wide even though it reaches 1-5 m (3-16 ft)
- Indoor Suitability: Yes – a popular foliage houseplant
- Best Spot: Full sun to full shade – bright, indirect light indoors
- Soil & Drainage: Airy, free-draining mix
- Watering in Pots: Average to plenty; let the top just dry
Indoors & On the Windowsill
- A popular foliage houseplant: Give it space and bright, indirect light; it spreads wide, so allow room, and wipe the big leaves clean.
- Warmth & humidity: Keep it warm with a little humidity and away from cold draughts.
- Safety: Sap contains calcium oxalate – keep it from children and pets.
On a Balcony or Patio
- Bright shade: Best in bright shade or part sun outdoors; shelter the big leaves from wind.
- Water & drainage: Keep evenly moist with free drainage; do not let the pot stand in water.
Choosing the Pot, Soil & Long-Term Care
- Pot & mix: A large, sturdy pot with an airy, free-draining mix and strong drainage.
- Feeding: Feed through the growing season – pots leach nutrients faster.
- Repotting: Pot up every couple of years as it broadens.
Growing this plant in a greenhouse
A greenhouse can give philodendron selloum frost protection, cold protection, humidity control and extra warmth. In the right climate it may also be kept growing through winter, depending on how much warmth and light are provided.
Greenhouse at a glance
| Greenhouse suitability | Good - clearly useful |
|---|---|
| Main benefits | frost protection, cold protection, humidity control, extra warmth |
| Season extension | earlier spring & later autumn |
| Outdoor protection advisable below | about 10°C |
| Maintain greenhouse minimum | around 10°C for active growth |
| Suitable types | heated greenhouse, polycarbonate greenhouse |
| Heating | Heating is recommended in cold climates for continuous growth. |
Related greenhouse guides
- Greenhouses: How to Choose the Right Greenhouse
- Best Greenhouse Heaters
- Greenhouse Climate Control: Temperature, Ventilation and Humidity
- Polycarbonate Greenhouses: What to Look for Before Buying
Fertilizing & Feeding
A light to moderate feeder: feed with a balanced fertilizer only while the plant is in active growth, and hold off in low light or cool conditions. A large-leaved warm-climate philodendron grown for foliage indoors or in shade; keep feeding steady but dilute in active growth and ease off in cool or dim spells.
Quick Fertilizing Specs
| Feeding Level | Light to moderate feeder |
|---|---|
| Main Nutrient Priority | Balanced feeding with adequate nitrogen for healthy foliage |
| Best Feeding Period | Spring through the warm, brighter active growing season |
| Organic Options | Compost or worm castings worked into the potting mix, plus a diluted complete liquid feed |
| Reduce/Stop Feeding | Hold off feeding in low light, cool weather, and right after repotting |
| Micronutrients | Usually supplied by a complete fertilizer; correct only diagnosed iron or manganese shortages |
| Soil pH | Slightly acidic to near neutral |
Feeding by Growth Stage
Settling in after potting or repotting
Let fresh roots establish in new mix before any feeding begins.
| Nutrient direction | None – withhold fertilizer while the plant is not in active growth. |
|---|---|
| Timing | The first weeks after potting up or repotting into fresh mix. |
| Frequency | No feeding at this stage; resume only when active growth returns. |
| Fertilizer types | No feeding at this stage; hold off fertilizing until active growth resumes. |
| Precautions | Withhold fertilizer now; feeding a plant that is not actively growing wastes nutrients and risks salt buildup in the root zone. |
Warm-season active growth
Support steady, well-colored foliage while the plant is actively growing.
| Nutrient direction | A balanced complete fertilizer with adequate nitrogen to fuel leafy growth, kept dilute for a containerized plant. |
|---|---|
| Timing | Through the warm, brighter part of the year when new leaves are forming. |
| Frequency | Light, regular feeding spread across the active growing season. |
| Fertilizer types | A balanced complete liquid fertilizer, applied dilute, Compost or worm castings top-dressed into the mix |
| Routine trace nutrients | iron, manganese |
| Precautions | Keep feeding light and always water first; overfeeding a containerized foliage plant scorches roots and dulls leaf color. |
Low-light or cool-season slowdown
Let the plant coast through low light or cool conditions without pushing weak growth.
| Nutrient direction | None – withhold fertilizer while the plant is not in active growth. |
|---|---|
| Timing | During short winter days, low indoor light, or cool spells when growth stalls. |
| Frequency | No feeding at this stage; resume only when active growth returns. |
| Fertilizer types | No feeding at this stage; hold off fertilizing until active growth resumes. |
| Precautions | Withhold fertilizer now; feeding a plant that is not actively growing wastes nutrients and risks salt buildup in the root zone. |
Nutrient Deficiency Signs & Corrections
Older, lower leaves fade to pale green or uniform yellow and overall growth slows.
| Possible causes | low available soil nitrogen, nitrogen leaching from heavy watering or rain, thin, low-organic-matter soil |
|---|---|
| Appears first on | older, lower leaves |
| What to check | recent feeding history, soil organic matter, watering and drainage |
| Possible correction | Apply a nitrogen-containing complete fertilizer and build soil organic matter, then water evenly. |
New leaves yellow between the veins while the veins themselves stay green.
| Possible causes | low available iron, high soil pH locking up iron, cold or waterlogged roots limiting uptake |
|---|---|
| Appears first on | youngest leaves |
| What to check | soil pH, drainage and root health, whether symptoms are on new growth |
| Possible correction | Correct soil pH and improve drainage, then apply a chelated iron product per its label if new growth stays chlorotic. |
Leaf margins and tips brown or scorch and growth stalls despite adequate watering.
| Possible causes | fertilizer salt buildup in the root zone, under-watering that concentrates salts, excessive or too-frequent feeding |
|---|---|
| Appears first on | leaf margins and tips |
| What to check | recent fertilizer amounts, watering consistency, drainage, especially in containers |
| Possible correction | Ease off feeding, water thoroughly to flush accumulated salts from the root zone, then return to lighter feeding. |
Pruning, Training & Seasonal Maintenance
Despite being labelled a vine, Philodendron selloum (now Philodendron bipinnatifidum) is a self-heading arborescent aroid: it builds a single crown of huge, deeply cut leaves on a thickening trunk marked with old leaf scars, and it does not climb or branch. That single growing point means there is no framework to prune and no topping without spoiling the plant — maintenance is removing old lower leaves as they yellow (ideally before winter), spent flowers and damaged fronds. Size can only be eased by taking off outer/lower leaves; the sap is an irritant, so wear gloves.
Quick Pruning & Maintenance Specs
| Pruning Tolerance | Low for structure (single crown); leaf-removal tolerated |
| Primary Pruning Window | Before winter — remove old and tired leaves |
| Secondary Maintenance Window | Ongoing grooming through the growing season |
| Typical Frequency | Occasional grooming; slow-to-medium grower |
| Main Objective | Remove old lower leaves, spent blooms and damaged fronds; keep a tidy crown |
| Young Plant Priority | Let the crown form; remove only damaged leaves |
| Mature Plant Priority | Remove aging lower/outer leaves; manage aerial roots |
| Best Tool Type | Bypass secateurs; loppers for very thick petioles |
| Avoid Heavy Pruning During | Any time — never cut the central growing crown |
Pruning by Plant Age & Size
Newly Established
Remove only damaged leaves; let the plant build its crown and root system.
Young / Formative
No structural training — it self-heads into a single rosette. Simply keep it clean of damaged fronds; if grown on a support for the vining look, tie loosely, but it naturally forms a self-supporting trunk.
Mature / Established
Remove aging lower and outer leaves at the petiole base to lift and tidy the trunk, take off spent inflorescences, and manage the thick aerial roots (leave them, guide them to soil, or trim lightly). Removing lower leaves is the main way to reduce bulk.
Seasonal Pruning & Ongoing Maintenance
Groom continuously as leaves age, and do the main tidy of old foliage before winter as the source suggests, so the plant enters the cool season clean. There is no dormant structural pruning — it keeps a single evergreen crown.
Structural Pruning & Training
With one growing point there is no branch framework to build or thin. The only structural action is removing lower/outer leaves to expose and lift the trunk. Cutting the crown out stops the plant, so avoid it — if a specimen is far too tall, it can sometimes be beheaded and the top re-rooted, but this is drastic and loses the established form.
Special Growth to Remove
Remove aging lower leaves, spent inflorescences and damaged fronds. Aerial roots are natural support/feeding structures — retain or guide them rather than routinely cutting. Basal offsets can be removed to propagate or to keep a single clean trunk.
Container & Small-Space Pruning
A very popular container plant, but note you cannot dwarf it by topping — size is limited by removing the largest lower leaves and by root-pruning or potting-on. Keep it to scale by leaf removal and pot size, not by cutting the crown.
Tools
The leaf stalks are thick and fibrous: bypass secateurs handle most, and loppers deal with the stoutest petioles on a large plant. No shearing — every cut is a selective leaf removal.
Tool Hygiene & Disease Risk
Routine — keep blades clean; no major pruning-borne disease in normal culture. Wear gloves for the irritant aroid sap and wash your hands afterwards.
Cut Placement & Technique
Cut each leaf petiole cleanly close to the trunk without gouging the trunk itself, which would scar the plant and invite rot.
Heavy Pruning & Rejuvenation
Not tolerated as structural pruning. This single-crown plant cannot be cut back like a shrub for rejuvenation; heavy cutting removes the growing point. A too-tall specimen can only be renewed by air-layering or beheading and re-rooting the top — a propagation technique, not routine pruning.
Post-Pruning Care
Keep warm, moist and out of harsh direct sun (it scorches) after grooming; each big leaf is a major energy source, so do not strip many green leaves at once.
Common Pruning Mistakes
- Cutting or damaging the single growing crown.
- Trying to reduce height by topping — it will not rebush like a shrub.
- Removing too many healthy green leaves and weakening the plant.
- Gouging the trunk when removing petioles.
When NOT to Prune
Never cut the central crown; avoid removing many leaves just before winter cold or during a stress period, and do not prune hard after repotting.
Recommended Tools (by task)
- bypass_secateurs — removing spent and aging leaves.
- loppers — cutting the thickest petioles on a large, mature plant.
Propagation Guide
The quickest reliable way to increase this self-heading Philodendron is to remove rooted basal offshoots or to air-layer a stem, both of which come true to the parent; stem sections carrying a node also root in warm, humid conditions. Seed is possible but slow and rarely used. Overall an easy to moderate plant to propagate.
Quick Propagation Specs
| Best Propagation Method | Division of basal offshoots / stem cuttings |
| Alternative Methods | Air layering; seed |
| Propagation Difficulty | Easy to Moderate |
| Seed True-to-Type | Usually true-to-type (species), but slow |
| Vegetative True-to-Type | Yes |
| Best Propagation Season | Spring, once cold has passed (site) |
| Cutting / Layer Rooting Time | A few weeks to a few months (site) |
Stem Cuttings
Cutting Type
Semi-woody stem sections, each including at least one node (ideally with an aerial-root bump).
Best Timing
Spring, when there is no longer any danger of cold (site).
Rooting Setup
Moist, warm and shaded, under high humidity (site: moist, warm, shade).
Rooting Hormone
Optional — nodal aroid cuttings usually root without it.
Rooting Time
Typically a few weeks to a few months, depending on warmth and humidity (site).
Air & Ground Layering
Wound and wrap a stem just below a node in moist medium; the site reports rooting takes from a few weeks to a few months depending on conditions. Sever below the new root mass once it is well formed.
Division, Offsets, Pups & Suckers
Mature plants form basal offshoots that can be separated with roots attached in spring and potted individually.
Growing from Seed
Fresh aroid seed sown on a warm, humid, moist surface can germinate, but seed is slow and is rarely the practical choice for this plant.
Bloom & Flower Guide
Quick Details
- Bloom Season: Late spring to summer (late winter to summer in warm climates)
- Flower Appearance: A creamy white-yellow spathe (10-30 cm) around a spadix with a beehive-like surface
- Edibility: Not edible – contains calcium oxalate
Detailed Blooming Overview
This philodendron has a remarkable thermogenic bloom – the spadix actually heats up in the evening, releasing scent that draws in scarab beetles, which the grower correctly names as the pollinator. It flowers late spring to summer, and earlier in warm climates.
Flower Characteristics
- Creamy white-yellow spathe, 10-30 cm.
- Spadix with a beehive-like interior that warms to release scent.
Bloom Care & Thinning
- Pollination: By beetles drawn to the warm, scented spadix.
- Safety: Sap is an irritant; the flower is not for eating.
Pests, Diseases & Troubleshooting
Overview: Philodendrons are famously tough aroids, and the great majority of their problems are cultural rather than pest-driven – the brown leaf edges people notice come from dry air, fertiliser salts, tap-water fluoride/chloride or overwatering. When insects do appear they are the usual houseplant sap-suckers: aphids, mealybugs, scale, spider mites and thrips. Their main disease risk is root and stem rot from a soggy mix.
Quick Troubleshooting Overview
| Issue / Pest | Main Symptom | Primary Solution |
|---|---|---|
| Brown leaf edges/tips | Crisp brown margins and tips | Raise humidity, flush salts, use filtered water |
| Root rot | Yellow lower leaves, mushy stem base | Let mix dry, improve drainage, repot |
| Mealybugs | White fluff in leaf axils | Alcohol swab, horticultural oil, isolate |
| Spider mite | Fine stippling, webbing in dry air | Raise humidity, rinse leaves, horticultural oil |
| Scale | Brown bumps on stems and midribs | Scrape off, horticultural oil |
| Fungus gnats | Flies over constantly damp mix | Let surface dry, sticky traps, top-dress grit |
Common Pests & Management
- Aphids (Aphidoidea spp.):
- Symptoms: Small soft-bodied green, black or grey insects clustered on new leaves and unfurling growth; causes curled, distorted foliage, sticky honeydew and sooty mould. Look-alikes: whitefly (which flies up when disturbed).
- Prevention & Control: Encourage ladybirds, lacewings and parasitic wasps; blast colonies off with a firm jet of water; remove badly infested tips. Persistent outbreaks respond to insecticidal soap or a light horticultural oil applied to leaf undersides in the cool of the evening to protect pollinators.
- Mealybugs (Pseudococcidae spp.):
- Symptoms: White cottony masses in leaf axils, on stems and around the crown; feeding causes yellowing, stunting and honeydew with sooty mould.
- Prevention & Control: Dab individual colonies with a cotton bud dipped in surgical spirit; isolate affected plants; keep humidity moderate. For wider spread use insecticidal soap or horticultural oil, repeating every 7–10 days to catch newly hatched crawlers.
- Scale insects (Coccidae & Diaspididae spp.):
- Symptoms: Immobile brown or tan bumps along stems and leaf veins, often with sticky honeydew and sooty mould; slow decline and yellowing.
- Prevention & Control: Scrape off light infestations by hand or with a soft toothbrush; prune out heavily encrusted stems. Smother remaining scale with horticultural oil, targeting the mobile crawler stage with repeat applications.
- Two-spotted spider mite (Tetranychus urticae):
- Symptoms: Fine pale stippling on leaves, faint webbing on undersides and leaf axils, and a dusty bronzed look in warm dry conditions. Tiny moving specks visible with a hand lens.
- Prevention & Control: Raise humidity and hose foliage regularly, as mites thrive in hot dry air; introduce predatory mites (Phytoseiulus persimilis) under cover. Treat hotspots with insecticidal soap or horticultural oil, ensuring thorough coverage of leaf undersides.
- Thrips (Thysanoptera spp.):
- Symptoms: Silvery streaks and flecking on leaves and petals, black frass specks, and distorted new growth; slender fast-moving insects.
- Prevention & Control: Use blue sticky traps for monitoring; remove weeds and spent flowers that harbour them; encourage predatory mites and pirate bugs. Spot-treat with insecticidal soap or spinosad-type products following the label.
- Fungus gnats (Bradysia spp.):
- Symptoms: Small dark flies drifting over the soil; larvae in constantly wet mix feed on fine roots and organic matter, weakening young plants.
- Prevention & Control: Let the top of the mix dry between waterings, top-dress with grit or sand, and use yellow sticky traps; a Bacillus thuringiensis israelensis (Bti) drench for persistent larvae.
Diseases & Fungal Issues
- Root & stem rot (Pythium / Phytophthora spp.):
- Symptoms: Yellowing lower leaves, a soft mushy stem base and a plant that wilts in wet soil, from overwatering or a compacted airless mix.
- Treatment & Management: Let the mix dry appropriately, improve drainage and repot into fresh chunky aroid mix, cutting away any blackened roots and stem; do not leave the pot standing in water.
- Bacterial leaf spot / blight (Erwinia / Xanthomonas spp.):
- Symptoms: Dark, water-soaked, sometimes yellow-haloed spots that spread fast and may smell, especially with wet leaves and warm stagnant air.
- Treatment & Management: Remove affected leaves with a sterile blade, keep foliage dry, improve airflow and isolate the plant; avoid overhead watering. Copper products give limited help.
- Fungal leaf spot (Colletotrichum / Cercospora spp.):
- Symptoms: Brown or tan spots, sometimes with a yellow halo, in humid conditions.
- Treatment & Management: Remove spotted leaves, keep foliage dry and improve ventilation; a copper fungicide for stubborn cases.
Growing Difficulties & Abiotic Problems
- Brown leaf edges & tips:
- Cause & Symptoms: The plant’s classic complaint: low humidity, fertiliser-salt build-up, or fluoride/chloride in tap water scorches leaf margins and tips crisp brown.
- Correction Strategy: Raise humidity, flush the pot with clean water every so often to leach salts, ease off feeding, and use filtered, distilled or rainwater on sensitive plants.
- Yellowing leaves:
- Cause & Symptoms: Overwatering (soggy roots) is the usual cause; underwatering, low light or nutrient shortage can also yellow leaves.
- Correction Strategy: Check the roots and let the mix dry appropriately; give bright indirect light and a balanced feed in the growing season.
- Leggy, small-leaved growth:
- Cause & Symptoms: Insufficient light makes stems stretch with widely spaced, undersized leaves.
- Correction Strategy: Move to brighter indirect light and provide a moss pole for climbing types to encourage larger mature foliage.
What Helps – Products & Tools
Because most philodendron problems are cultural, the best ‘products’ are filtered water, a chunky free-draining aroid mix and a moss pole. For the occasional pest, use surgical spirit or light horticultural oil for mealybugs and scale, insecticidal soap for aphids, mites and thrips, and yellow sticky traps plus a Bti drench for fungus gnats. Copper fungicide is reserved for stubborn leaf spot.
