Plant Profile & Key Characteristics
Overview: Elleanthus is an evergreen tropical orchid growing as reed-like stems from about 0.3 up to 3 m (12-120 in) tall depending on species. It is grown as an ornamental and fragrant cut flower for its dense, beehive-like clusters of small trumpet blooms.
Quick Specifications
| Specification | Attribute |
|---|---|
| Plant Type / Life Cycle | Herbaceous perennial (orchid) |
| Foliage Type | Evergreen |
| Mature Size | 0.3-3 m (12-120 in) tall |
| Growth Rate | Slow to moderate |
| Hardiness | USDA zone 10b-12 |
Growth Form & Structure
- Height & Spread: Reed-like leafy stems 0.3-3 m (12-120 in) tall; well suited to pots and indoor culture.
- Growth Habit & Form: Clumping reed-stem orchid with slender upright canes.
- Lifespan & Maturity: Long-lived perennial orchid.
Anatomy & Physical Features
- Leaves & Foliage: Green elliptic leaves with pointed tips arranged along the stems.
- Flower Characteristics: Small trumpet-shaped flowers in yellow, pink, purple, red or orange, packed into dense beehive-shaped clusters (full detail in the Bloom guide).
Primary Uses & Landscape Value
- Functional & Ornamental Roles: Grown as an ornamental and fragrant cut flower; suited to containers and greenhouse or indoor culture.
Care Guide: Planting, Soil & Watering
Overview: Elleanthus is a tropical epiphytic orchid that thrives in warm, humid conditions (roughly 24-30C by day and 10-16C at night) with bright but filtered light. Rather than garden soil it needs a loose, fast-draining bark-based orchid mix that stays lightly moist while never becoming waterlogged.
Quick Care Requirements
| Requirement | Ideal Condition |
|---|---|
| Planting Season | Warm season (spring to summer) |
| Growth Rate | Slow to moderate |
| Soil Type | Loose, airy bark or cork orchid mix (free-draining) |
| Water Need | High – keep the bark evenly moist, never soggy |
Planting & Establishment
- Best Planting Season: Pot or repot in spring and summer, during active warm-season growth.
- How to Plant:
- Hole Preparation: Choose a pot only slightly larger than the root mass – an oversized pot stays wet and rots roots; a transparent pot lets you watch the roots and moisture.
- Soil Amendments: Use a chunky mix of bark or bark chips, adding cork and a little Styrofoam to keep air around the roots; avoid dense garden soil.
- Planting Depth: Settle the plant so the base of the growth sits at the surface of the mix and the roots are anchored, without burying the crown.
- Growth Speed & Expectations: Expect slow to moderate growth even in ideal conditions; steady care rewards you with a gradually larger plant.
Soil, Watering & Drainage Care
- Soil Mix & Drainage Needs: The bark medium must drain freely and stay open so air reaches the roots; refresh it before it breaks down and turns acidic, which suffocates and rots the roots.
- Watering Schedule & Technique:
- Young / Newly Planted: Water often enough to keep new roots from drying, using clean, low-salt water such as room-temperature rainwater.
- Established: Water generously and keep the bark evenly moist while making sure excess drains away, and hold humidity above 50%.
- Seasonal Adjustments: Water more in warm, active growth and ease off as temperatures and light drop; keep temperatures as steady as possible.
Climate, Light & Hardiness
Elleanthus is a subtropical terrestrial-type orchid tolerant of a wide range of light from full sun to full shade, needing consistently ample water and stable temperatures. It has no genuine outdoor frost tolerance and is sensitive to sudden temperature changes.
Quick Climate Specifications
| Climate Zones | Subtropical, or greenhouse/houseplant |
| USDA Hardiness Zones | 10b–12 |
| Optimal Temp Range | Day approximately 24–30°C (75–85°F); night approximately 10–16°C (50–60°F) |
| Frost Tolerance | None |
| Light Conditions | Full Sun / Half Shade / Full Shade |
Sunlight & Light Exposure
Optimal Light Setup
Adaptable across full sun to full shade.
Temperature Extremes & Hardiness
USDA Hardiness & Regional Limits
Zone 10b–12 reflects a subtropical orchid with no genuine outdoor frost tolerance; grown under protection outside this range.
Cold Damage & Winter Protection
Very sensitive to changing temperatures - stability matters as much as staying within its warm-day/cooler-night range.
Frost Sensitivity
No frost tolerance.
Wind, Humidity & Microclimate
Rainfall & Seasonal Moisture
Needs a big amount of water and consistent moisture.
Microclimate Recommendations
A sheltered, stable-temperature spot (greenhouse or bright indoor location) suits it better than one prone to swings.
Growing in Pots, Balconies & Indoors
Elleanthus (Elleanthus) is a larger orchid (about 0.3-3 m) and a genuine houseplant – the grower confirms it grows well indoors, and orchids are almost always grown in a pot rather than open ground. Give it bright, indirect light near a window and it makes a rewarding, long-flowering indoor plant. It also takes brighter light than most orchids, so it can enjoy a sunnier window or a lightly shaded spot outdoors in summer. It also wants high humidity, so a bright bathroom, a humidity tray or regular misting helps.
Quick Details
- Container Size: A pot only about 20-40% larger than the root ball – orchids like to be snug
- Indoor Suitability: Yes – a true houseplant in bright, indirect light
- Best Spot: Adaptable – from bright indirect light to some direct sun
- Soil & Drainage: Never ordinary potting soil – use a coarse, open orchid medium (bark or cork chips) with lots of drainage holes
- Watering in Pots: Keep the medium consistently moist and humid – don’t let it dry out fully; let excess drain away and never leave the pot standing in water
Indoors & On the Windowsill
- A true houseplant: The grower confirms it thrives indoors – keep it near a bright window but out of harsh, direct midday sun.
- Windowsill growing: An east or shaded-south window is ideal; a clear pot lets you watch the roots and see when to water. It also wants high humidity, so a bright bathroom, a humidity tray or regular misting helps.
- Overwintering: As a tropical plant it is happiest indoors year round in cool climates – keep it warm, bright and away from cold draughts and frost.
On a Balcony or Patio
- Summering outdoors: It can spend warm spells on a shaded, sheltered balcony or patio in bright but indirect light – protect it from direct sun, drying wind and any chill. It also wants high humidity, so a bright bathroom, a humidity tray or regular misting helps. Pots and open orchid media dry quickly, so check moisture often.
Choosing the Pot, Soil & Long-Term Care
- Pot & drainage: A snug pot with many holes; a transparent pot is useful for watching the roots. Never let it sit in standing water – the fastest route to rot.
- Medium: A coarse, free-draining orchid mix of bark or cork chips (some more terrestrial types appreciate a little added coir or humus), not garden soil.
- Feeding & water quality: Feed with a dilute orchid fertiliser a few times a year; where possible use rain or distilled water, which orchids prefer.
- Repotting: Refresh the medium about every two years – bark breaks down and loses structure over time – and pot on when roots fill the container.
Fertilizing & Feeding
A light feeder, but because this cane-like orchid is watered heavily and can range from a compact to a quite tall grower, more frequent light feedings suit it better than infrequent heavy ones – nutrients are easily washed from the root zone between waterings.
Quick Fertilizing Specs
| Feeding Level | Light feeder |
|---|---|
| Main Nutrient Priority | Light, balanced feeding fed a little more often to offset leaching from this plant’s heavy water needs |
| Best Feeding Period | The spring-to-summer growing and flowering season |
| Organic Options | A diluted organic liquid feed made for container-grown plants can substitute for a synthetic fertilizer |
| Micronutrients | Usually supplied by a complete, weak fertilizer formulated for orchids or container plants |
| Soil pH | Grown in a free-draining, moisture-retentive mix rather than garden soil; keep the mix fresh so it continues to drain well despite heavy watering |
Feeding by Growth Stage
New stem and leaf growth
Support new stem and leaf growth on this cane-like orchid, since flower clusters form at the tips of maturing stems.
| Nutrient direction | A weak, balanced fertilizer, fed a little more often than a typical bark-grown orchid given this plant’s heavier water needs. |
|---|---|
| Timing | Through the main growing months as stems lengthen and put out new leaves. |
| Frequency | Light, regular feeding through the growing season; frequent heavy watering can wash nutrients out of the root zone between feedings, so favor smaller, more frequent doses. |
| Fertilizer types | A weak, balanced fertilizer diluted for container-grown orchids, A fertilizer suited to a free-draining, moisture-retentive mix |
| Routine trace nutrients | iron, manganese |
| Precautions | This plant is sensitive to sudden temperature changes, so keep shifts in feeding, watering, and environment gradual. |
Cluster bloom
Support the plant as it produces its beehive-shaped clusters of small trumpet flowers at the stem tips.
| Nutrient direction | Keep feeding balanced rather than switching to a high-phosphorus bloom product. |
|---|---|
| Timing | Spring into summer, as flower clusters develop and open. |
| Frequency | Continue the same light, regular feeding through flowering; the many small flowers in each cluster do not call for heavier feeding. |
| Fertilizer types | The same weak, balanced fertilizer used during vegetative growth, Avoid high-phosphorus bloom-booster products |
| Routine trace nutrients | iron, manganese |
| Precautions | Do not increase fertilizer strength while flower clusters are developing or open. |
Cooler-season rest
Let growth slow through the cooler part of the year once flowering has finished.
| Nutrient direction | None – withhold fertilizer while growth is minimal. |
|---|---|
| Timing | Autumn through winter. |
| Frequency | No feeding at this stage. |
| Fertilizer types | No feeding at this stage; feeding begins again once new stem growth starts in spring. |
| Precautions | Do not fertilize during this rest, and avoid sudden temperature swings, which this orchid tolerates poorly. |
Nutrient Deficiency Signs & Corrections
New stems grow noticeably thinner than earlier growth and older leaves fade to a dull, pale green.
| Possible causes | nutrients leaching away quickly because of this plant’s heavy water needs, low light limiting overall growth and nutrient demand, stem or root damage limiting nutrient uptake |
|---|---|
| Appears first on | older leaves and the thickness of new stems |
| What to check | feeding frequency relative to watering, stem and root condition, light levels |
| Possible correction | Feed lightly but more regularly, since heavy watering can wash nutrients out of the root zone between feedings. |
Leaf tips and margins show yellowing or scorch-like browning, and flower clusters are smaller or fewer than expected.
| Possible causes | a feeding program low in potassium relative to nitrogen, made worse by heavy watering that leaches nutrients, buildup of salts or minerals on the growing medium interfering with nutrient balance, root damage limiting overall nutrient uptake |
|---|---|
| Appears first on | older leaf margins and tips |
| What to check | fertilizer balance and feeding frequency, signs of buildup on the medium surface, root condition |
| Possible correction | Use a balanced fertilizer that supplies adequate potassium and flush the medium periodically given how much this plant is watered. |
New leaves near the stem tips emerge pale yellow while the veins stay distinctly greener.
| Possible causes | a medium or water source that has pushed the root zone outside the range this orchid prefers, waterlogged or poorly aerated medium from this plant’s heavy water needs, an extended period without micronutrient feeding |
|---|---|
| Appears first on | newest leaves near the stem tips |
| What to check | medium drainage given how heavily this plant is watered, water quality, recent feeding history |
| Possible correction | Improve drainage first, then apply a chelated iron product per its label if chlorosis persists. |
Pruning, Training & Seasonal Maintenance
Elleanthus is a clump-forming reed-stem orchid whose thin canes carry a dense terminal cluster of small tubular flowers rather than a single large bloom. Pruning tolerance is low: the main jobs are removing the spent flower cluster once it is fully finished and clearing whole canes only after they have completely browned, not shaping or size-reducing live growth. The safest window follows the spring/summer bloom period once flower clusters have dried; cutting a cane while its cluster is still fresh ends that display early.
Quick Pruning & Maintenance Specs
| Pruning Tolerance | Low |
| Primary Pruning Window | Late summer/autumn, once flower clusters and canes have fully finished |
| Secondary Maintenance Window | Year-round removal of dead leaves |
| Typical Frequency | Light, occasional; cane removal only as growth declines |
| Main Objective | Clear spent clusters and dead canes without removing productive growth |
| Young Plant Priority | Allow new canes to reach full height before any cutting |
| Mature Plant Priority | Thin only fully dead canes at the base to keep the clump open |
| Best Tool Type | Precision snips |
| Avoid Heavy Pruning During | Active flowering (spring-summer) |
Pruning by Plant Age & Size
Newly Established
Leave newly potted or divided plants uncut while new canes establish; this genus can take a full season to reach flowering size.
Young / Formative
No structural training applies. Where several canes are grown together in a pot, thin only overcrowded thin canes that are shading each other out, not healthy productive ones.
Mature / Established
Manage the clump by removing whole canes at the base once they are fully brown and leafless, making room for vigorous new canes from the rhizome; live canes with green foliage are left in place even after their cluster has finished, since foliage continues feeding the plant.
Seasonal Pruning Schedule
| Stage | Objective | Remove | Do Not Remove | Expected Response / Flowering Impact |
| Post-Flowering | Tidy after bloom | Fully dried terminal flower cluster | The cane and its foliage | Cane persists as foliage; does not rebloom from the same cluster but continues to support the plant |
| Ongoing Sanitary | General hygiene | Fully dead, browned canes and dead leaves | Any cane still green | Improves airflow through the clump; premature cane removal reduces the plant’s foliage/energy reserve |
Special Growth to Remove
- Fully dried terminal flower clusters
- Dead leaves along the canes
- Whole canes only once completely brown and leafless, cut at the base
Container & Small-Space Pruning
In a pot, crowded thin canes compete for light more than they would in the open — thin out only the weakest, non-flowering canes to maintain airflow, rather than cutting back live productive growth for compactness. Divide at repotting once the clump is dense, rather than pruning for size.
Tools
- precision snips — for clusters, dead leaves and thin canes
Tool Hygiene & Disease Risk
High-risk. Orchid-transmissible viruses spread readily on unsterilized blades; disinfect between plants and between cuts on any cane showing unusual streaking or dieback.
Cut Placement & Technique
Cut spent flower clusters just below the cluster, above the topmost healthy leaf. Cut fully dead canes flush at the base rather than leaving a stub.
Heavy Pruning & Rejuvenation
Elleanthus does not tolerate hard cutting-back of live canes. Rejuvenation is achieved by dividing an overgrown clump at repotting into sections with several canes and healthy roots each.
Post-Pruning Care
Let base cuts dry before the next watering to reduce rot risk. No extra feeding is needed after routine grooming.
Common Pruning Mistakes
- Cutting a cane back while its cluster is still fresh, mistaking early fading for fully spent
- Removing live green canes to control height instead of thinning only dead ones
- Leaving dead stubs rather than cutting flush at the base
When NOT to Prune
Avoid cutting during active flowering (spring-summer) and avoid disturbing a recently divided plant beyond removing clearly rotten tissue.
Recommended Tools (by task)
- precision_snips — the only tool needed for spent clusters, dead leaves, and thin dead canes on this small-stemmed genus
- blade_disinfectant — to limit orchid virus spread between cuts and plants
Propagation Guide
Elleanthus is best propagated by dividing established clumps of its cane-like stems, since the site’s own data describes sowing as very hard and states vegetative reproduction is required. Division is Moderate in difficulty, complicated mainly by the genus’s sensitivity to temperature change, while seed remains a specialist technique rarely used outside breeding programs.
Quick Propagation Specs
| Best Propagation Method | Division of clumps (canes with attached roots and rhizome) |
| Alternative Methods | Seed (very hard to sow per site data; specialist/lab technique) |
| Propagation Difficulty | Moderate (division); Specialist (seed) |
| Seed True-to-Type | Variable – seedlings may not match the parent plant, and this genus spans many species |
| Vegetative True-to-Type | Yes |
| Best Propagation Season | Spring to summer, during active growth |
| Seed Germination Time | Not detailed by the site beyond being very difficult; orchid seed generally germinates slowly (weeks to months) under sterile conditions |
| Germination Temperature | No reliable species-specific figure; sterile flask culture is typically run around 20–25°C (68–77°F) |
| Seed Sowing Depth | Not applicable – fine orchid seed is surface-sown on sterile medium, not soil |
Growing from Seed
Seed Handling & Viability
Site data describes sowing as very hard; as with most orchids the dust-like seed lacks food reserves and needs sterile in-vitro sowing rather than soil, which is why vegetative propagation is the practical default.
Division, Offsets & Pups
Divide congested clumps in spring as new growth begins. Because plant size varies considerably by species within this genus, judge division vigor by the individual clump; each division should keep several canes with their own roots and a section of connecting rhizome.
Given the genus’s flagged sensitivity to temperature swings, keep new divisions warm, humid, and shaded from direct sun while re-establishing, potted in a well-drained bark or cork-chip mix as described in the site’s general care guidance.
Bloom & Flower Guide
Quick Details
- Bloom Season: Spring to summer
- Flower Appearance: Small tubular flowers packed into a dense beehive-shaped head, in yellow, pink, purple, red or orange
- Edibility: Ornamental only – grown as a fragrant orchid, not eaten
Detailed Blooming Overview
Elleanthus is a terrestrial orchid from humid, cool tropical highlands. Its charm is in the flower head: many small, tubular blooms crowded together into a tight cone or beehive shape, often in glowing warm colors and sometimes more than one color at once. In the wild these nectar-filled tubes are worked by hummingbirds and insects. It is fragrant, makes a good cut flower, but is fussy about steady temperatures.
Flower Characteristics
- Small trumpet-shaped flowers in yellow, pink, purple, red or orange, sometimes multicolored.
- Flowers clustered into a dense, beehive-like head.
Bloom Care & Thinning
- Steady conditions: This orchid is very sensitive to temperature swings – keep it even and humid to hold buds and flowers.
- After flowering: Remove spent flower heads once they finish.
Pests, Diseases & Troubleshooting
Overview: Elleanthus are Neotropical orchids that share the whole family’s pest and disease profile – scale, mealybugs, mites and thrips above ground, and rots and viruses in wet, unventilated conditions. As with all orchids, prevention through clean tools, airflow and careful watering matters far more than spraying.
Quick Troubleshooting Overview
| Issue / Pest | Main Symptom | Primary Solution |
|---|---|---|
| Boisduval scale | Round straw/white scales in leaf axils, yellowing | Isolate; scrub off; horticultural oil |
| Mealybugs | White cottony masses in crevices, honeydew | Dab with alcohol; hort oil; isolate |
| Spider mites | Silvery stippling/webbing, dull leaves in dry air | Raise humidity; rinse; insecticidal soap |
| Thrips | Silvery scarring, deformed new growth/flowers | Sticky traps; sanitation; spinosad/neem |
| Black rot | Water-soaked black spreading rot on leaves/crown | Cut into clean tissue; cinnamon; reduce wetness |
| Bacterial soft rot | Foul-smelling mushy collapse, fast spread | Excise; dry off; improve airflow; bactericide |
Common Pests & Management
- Boisduval scale (Diaspis boisduvalii):
- Symptoms: The classic orchid scale: circular straw-coloured to white armoured scales clustered in leaf axils, on pseudobulbs and under sheaths, with fluffy white male stages. Causes yellow spotting, weakening and, if unchecked, colonies that engulf the plant.
- Prevention & Control: Isolate affected plants immediately. Peel off old sheaths and scrub scales away with a soft toothbrush and soapy water or alcohol, then coat with a horticultural oil to smother survivors, repeating every couple of weeks to catch crawlers. Keep plants uncrowded and inspect new arrivals before adding them.
- Mealybugs (Pseudococcus / Planococcus spp.):
- Symptoms: White, cottony, waxy insects hiding in leaf axils, sheaths, roots and around new growth; honeydew, sooty mould and stunted, distorted shoots.
- Prevention & Control: Dab colonies with a cotton bud dipped in rubbing alcohol, rinse the plant, and follow with horticultural oil or insecticidal soap; check the roots and repot into fresh mix if they are infested. Isolate and re-treat regularly, as eggs hatch in flushes.
- Spider mites (Tetranychus urticae):
- Symptoms: Fine silvery or bronzed stippling on leaf surfaces, faint webbing beneath, and a dull, pitted look – worst in warm, dry, still air.
- Prevention & Control: Raise humidity and rinse foliage, especially undersides; wipe leaves clean. Conserve predatory mites and treat persistent infestations with insecticidal soap or a light horticultural oil, ensuring thorough undersurface coverage.
- Thrips (Thrips / Frankliniella spp.):
- Symptoms: Silvery streaking and scarring on leaves, deformed new growth, and flecked, distorted or spotted flowers; tiny slender insects that scatter when disturbed. Also a virus vector.
- Prevention & Control: Hang blue sticky traps to monitor, remove spent blooms and debris, and improve sanitation. Treat with neem or spinosad if numbers rise, spraying in the evening to spare pollinators.
- Aphids (Aphis / Myzus spp.):
- Symptoms: Soft green, black or yellow insects clustering on tender flower spikes, buds and new growth; honeydew, sooty mould and distorted, aborted blooms. Can transmit orchid viruses.
- Prevention & Control: Rinse them off with water, wipe spikes clean, and treat lingering colonies with insecticidal soap. Because they can spread virus, keep tools clean and inspect new plants.
- Snails & slugs (Gastropoda):
- Symptoms: Nocturnal chewing of tender roots, new leaf tips and especially flower buds and spikes, with slime trails; small bush snails hide in the mix.
- Prevention & Control: Hand-pick at night, set beer or bait traps, remove hiding places, and repot if bush snails infest the media. Iron-phosphate pellets are a wildlife-safer bait if needed.
Diseases & Fungal Issues
- Black rot (Phytophthora / Pythium spp.):
- Symptoms: Water-soaked spots that rapidly enlarge into soft, purplish-black rotting areas on leaves, new growths and crowns; can race through a plant, especially in cool, wet, stagnant conditions.
- Treatment & Management: Cut well back into clean, firm tissue with a sterile blade, dust the cuts with cinnamon or a copper fungicide, and let the plant dry out. Reduce overhead watering and crown wetness, improve airflow, and isolate infected plants.
- Bacterial soft / brown rot (Erwinia / Dickeya spp.):
- Symptoms: Fast-spreading, water-soaked, often foul-smelling mushy patches on leaves and crowns, sometimes oozing; a plant can collapse within days in warm, humid, wet conditions.
- Treatment & Management: Excise infected tissue immediately into healthy green, keep foliage dry, increase ventilation, and treat cut surfaces with cinnamon or a copper bactericide. Never overhead-water sick plants; isolate to prevent spread.
- Fungal leaf spots (Cercospora / Colletotrichum spp.):
- Symptoms: Yellow, brown or black spots and blotches, sometimes with a yellow halo or concentric rings, usually starting on older leaves in humid, crowded conditions.
- Treatment & Management: Remove and destroy affected leaves, space plants for airflow, water early so foliage dries, and apply a copper or broad-spectrum fungicide only if spots keep spreading.
- Orchid viruses (Cymbidium mosaic virus / Odontoglossum ringspot virus):
- Symptoms: Chlorotic or necrotic streaks, mosaic mottling, ringspots and colour-break in flowers; growth is stunted and never recovers. Spread by sap on tools and by sucking pests.
- Treatment & Management: There is no cure – isolate and ideally destroy confirmed infected plants. Prevent spread by sterilising cutting tools between every plant (flame or fresh blades), controlling aphids and thrips, and buying clean stock.
Growing Difficulties & Abiotic Problems
- Sunburn:
- Cause & Symptoms: Excess direct light bleaches leaves and leaves dry, sunken white-to-brown scorched patches, often where water droplets focused the sun.
- Correction Strategy: Provide the bright but filtered light these orchids prefer, increase shading in peak sun, and avoid wetting foliage in strong light. Damaged tissue won’t heal but new growth will be clean.
- Overwatering & root rot:
- Cause & Symptoms: Soggy, airless, or decomposed media suffocates roots, which turn brown and mushy; leaves yellow, shrivel and the plant loses anchorage.
- Correction Strategy: Use a fast-draining bark-based orchid mix, let it approach dryness between waterings, repot every year or two before the medium breaks down, and ensure pots drain freely.
- Dehydration & pleating:
- Cause & Symptoms: Underwatering, salt-damaged roots or low humidity cause limp, accordion-pleated leaves and shrivelled pseudobulbs.
- Correction Strategy: Check the roots, water more consistently, raise humidity, and flush the medium periodically to remove salts. Rehabilitate a poor root system in a humid, shaded spot.
- Salt & fertiliser burn:
- Cause & Symptoms: Over-feeding or hard water leaves crusty deposits and blackened, burnt root and leaf tips.
- Correction Strategy: Feed weakly but regularly (‘weakly, weekly’), flush the medium with plain water monthly, and use rain or low-mineral water where possible.
What Helps – Products & Tools
Orchid pest control leans on physical removal and gentle products: rubbing alcohol on a cotton bud, horticultural oil and insecticidal soap for scale, mealybugs and mites; blue sticky traps and spinosad or neem for thrips; cinnamon powder and copper fungicide/bactericide for rots; and a sterile blade for every cut. Good bark mix, humidity and airflow prevent most problems.
