How to Grow Pink Siam
Wikimedia Commons
Pink Siam
Anthurium andraeanum 'Pink Siam'
flowerPink Siam is a tropical flowering plant with distinctive heart-shaped pink spathes and contrasting spadices, prized as an ornamental houseplant. This cultivar produces long-lasting exotic flowers that can bloom year-round indoors with proper care. It is an epiphytic aroid native to Central and South America, making it well-suited to warm, humid indoor environments.
When should you plant Pink Siam in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Pink Siam timeline · Pittsburgh, PA (Zone 6b)
-
Plant Pink Siam
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
First Pink Siam blooms
Around Aug 15≈ 120 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Pink Siam dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in USDA zones 11-12; grown as houseplant in cooler climates
Sign up free to see if Pink Siam grows in your zone — and get a personalized planting timeline.
Get my Pink Siam timeline →Growth Stages
Establishment
4-8 weeksYoung plant with 3-5 leaves; root system developing in pot
Maintain humidity above 60%; avoid moving plant frequently; monitor for root establishment before increasing watering
Vegetative Growth
8-12 weeksPlant develops new leaves regularly; stems elongate; foliage becomes lush and dense
Fertilize bi-weekly with diluted balanced fertilizer; increase humidity with misting or humidifier; provide bright indirect light
Pre-Flowering
2-4 weeksPlant reaches mature size; leaf production slows; flowering buds begin to form at leaf axils
Maintain consistent warmth (65-80°F); increase phosphorus-rich fertilizer to encourage blooming; ensure adequate light
Flowering
4-8 weeks per bloom cycle; may repeat 3-4 times yearlyHeart-shaped pink spathes emerge with yellow or contrasting spadices; flowers persist for 4-8 weeks
Maintain humidity and consistent watering; avoid pesticide sprays on flowers; deadhead spent blooms to encourage new flowers
Maintenance & Repeat Bloom
OngoingPlant continues producing leaves and new flower buds throughout year with proper conditions
Prune aerial roots if desired; repot every 18-24 months; maintain steady feeding and humidity for continuous blooming
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Increase humidity; spray with water to dislodge; apply neem oil or insecticidal soap if severe
-
Remove with rubbing alcohol on cotton swab; spray with insecticidal soap; isolate infested plant
-
Scrape off manually; apply horticultural oil or insecticidal soap; treat every 7-10 days
-
Use yellow sticky traps; spray with neem oil; increase air circulation
-
Repot in fresh, well-draining soil; remove affected roots; reduce watering frequency
Uses
Not for consumption
CulinaryPink Siam contains calcium oxalate crystals and is toxic if ingested; all parts should be kept away from children and pets. [source]
Cut flower arrangements
HouseholdLong-lasting pink spathes are prized in floral arrangements and can remain fresh for 4-8 weeks in water, making them ideal for formal displays and exotic bouquets. [source]
Tropical indoor decoration
HouseholdThe exotic pink heart-shaped flowers and glossy green foliage make Pink Siam an elegant specimen plant for warm indoor spaces, adding tropical ambiance to homes and offices. [source]
Pollinator attraction
WildlifeIn tropical regions where grown outdoors, the distinctive spadix attracts native insects and provides nectar; grown indoors, it requires hand pollination for seed production. [source]
Air purification properties
MedicinalLike other Anthurium varieties, Pink Siam is reported to filter indoor air pollutants such as ammonia and formaldehyde, though research on efficacy is limited. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flower stems at the base when spathe is fully open and shows true color; flowers last 4-8 weeks in a vase; change water every 3-4 days; remove lower leaves from cut stems. For houseplant display, remove spent flowers to encourage continuous blooming.
Fun Facts
- 🌱 Pink Siam flowers are actually an inflorescence composed of a modified leaf (spathe) surrounding a spike-like appendage (spadix); the true flowers are tiny and embedded on the spadix surface.
- 🌱 Anthurium plants can bloom year-round indoors if provided with consistent warmth, humidity, and light, with individual flowers lasting 4-8 weeks—longer than almost any other cut flower.
- 🌱 The name 'Anthurium' comes from Greek words meaning 'flower tail,' referring to the distinctive protruding spadix that resembles a tail emerging from the heart-shaped spathe.
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Pink Siam planting timeline
Tell us your zip code and we'll calculate exactly when to start Pink Siam seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Pink Siam timeline →