Watering an Anthurium: frequency, water, epiphyte substrate

Watering an Anthurium is more subtle than other houseplants because this plant was originally epiphytic (aerial roots clinging to trunks in tropical forests). Very draining substrate + measured watering + high ambient humidity: the winning combination.

Why substrate is crucial for Anthurium

Anthurium andraeanum naturally grows as epiphyte or hemi-epiphyte in Colombian and Ecuadorian forests: roots cling to tree trunks and draw water and nutrients from humid air and decomposing organic matter (mosses, lichens, bark).

Consequence: roots adapted to very aerated and draining environment. In ordinary too-dense substrate (pure potting), water stagnates around roots which rot in weeks.

Ideal substrate:

• 40% pine bark (special orchid mix, in garden centers)
• 30% green plant potting
• 20% perlite (aeration)
• 10% sphagnum moss (controlled retention)

Pot with drainage mandatory.

Frequency by season

These frequencies are indicative. Finger test remains reliable.

The finger test

Insert finger 2 cm into substrate before each contemplated watering:

• Dry on surface: water
• Slightly moist at 2 cm: wait 2-3 days
• Moist or saturated: don’t water, wait 1 week

Anthurium wants substrate slightly moist permanently (not saturated, not completely dry).

Which water to use

Anthurium is less fluoride-sensitive than Dracaenas or Calatheas, but still prefers soft water:

By preference:

1. Rainwater: ideal, free, no limescale or fluoride
2. Brita-filtered water: acceptable
3. Tap water settled 24h (removes chlorine, not fluoride)
4. Direct tap water in soft-water region: OK

Avoid:

• Direct tap water in hard-water region (long-term brown tips)
• Salt-softened water (toxic)

Temperature: room-temperature water (18-22°C). Cold direct water can shock.

Watering method

Standard method:

1. Remove pot from cachepot
2. Pour water slowly across whole substrate surface, not on plant heart (rot risk for emerging spathes)
3. Continue until water flows from drainage holes
4. Wait 30 minutes
5. Empty saucer (critical step). Stagnant water = guaranteed root rot.

Bath method (occasional): Use every 1-2 months for deep hydration.

1. Plunge pot in basin of lukewarm water (lower 1/3 of pot height)
2. Wait 10-15 minutes (draining substrate absorbs fast)
3. Drain 30 minutes
4. Replace without full saucer

Ambient humidity: critical

Anthurium wants 60-80% ambient humidity. In heated apartment in winter, you’re at 25-35%. The #1 challenge for Anthurium in continental Europe.

Solutions by effectiveness:

1. Humidifier in room (ideal, measurable with hygrometer)
2. Pebble tray with water under pot (local humidity around)
3. Group with other plants (mutual transpiration)
4. Daily misting morning with sprayer (temporary effect)
5. Bathroom or kitchen (naturally higher humidity)

Without sufficient humidity, Anthurium survives but progressively loses spathes and accumulates brown tips.

Common mistakes to avoid

Ordinary substrate (pure potting). The #1 mistake. Too dense, roots rot. Always orchid mix.

Watering plant heart. Rot of emerging spathes. Target the substrate.

Saucer with stagnant water. Cause #1 of death. Empty 30 min after watering.

Ignoring ambient humidity. Anthurium doesn’t survive long-term at 30% humidity.

Fertilizer at every watering. Too much. Every 15 days only, half-dose.

Fertilizer: essential for reblooming

Anthurium is phosphorus-greedy for spathe production:

• Flowering plant fertilizer (NPK type 10-30-20 or 5-15-30)
• Every 15 days April-September
• Half-dose
• No fertilizer in winter

Without phosphorus fertilizer, Anthurium makes leaves but no spathes.

See also Anthurium not flowering for reblooming diagnosis, Anthurium yellow leaves if overwatering suspected, and Anthurium brown leaves for humidity problem.