How Often to Water an Anthurium: Check the Mix, Not the Date

There is no single correct interval for watering an anthurium. The right moment is when the top layer of mix has dried, and how long that takes depends on your pot, your mix, your light and the season.

The extension guidance agrees on the trigger. NC State Extension says to water Anthurium andraeanum when the top 2.5 cm (1 in) of soil feels dry. The RHS anthurium growing guide says to water only once the compost is approaching dryness, checked with a finger about 5 cm (2 in) below the surface. UF/IFAS Extension’s interiorscape anthurium guidelines say to let plants dry slightly between waterings, then water thoroughly.

How to check before you water

1. Push a finger into the mix 2.5–5 cm (1–2 in) deep, near the edge of the pot.
2. If it still feels damp at that depth, wait and check again in a day or two.
3. If it feels dry, lift the pot. A dry pot feels noticeably lighter than one you have just watered.
4. In a deep pot, check deeper. Virginia Cooperative Extension’s container watering guide suggests probing 2.5–7.5 cm (1–3 in) depending on container size.

A dry surface alone does not mean the root zone is dry. The Virginia guide notes that the upper few inches of mix dry faster than the rest, especially in tall pots.

How much to give

Water until the whole root ball is wet and water runs from the drainage hole. Clemson Extension’s anthurium care notes give the same rule: water thoroughly, then let the soil dry slightly.

Then empty the saucer. Virginia Cooperative Extension advises not leaving a container standing in water for more than 60 minutes. The RHS warns that leaving anthuriums in waterlogged compost for long periods causes root rot.

If water rushes straight through, the mix may have dried hard. Give two or three slow applications so it can soak in, as the Virginia guide recommends.

Why the interval changes

The Virginia guide explains that most houseplants do not need a rigid schedule. These conditions shorten or lengthen the time between waterings:

Condition	Effect on the interval
Small pot	Dries faster; check more often
Large or oversized pot	Holds water longer; check less often
Terracotta pot	Loses water through the walls; dries faster
Glazed or plastic pot	Holds water longer
Coarse, bark-rich mix	Drains and dries faster
Bright light and warmth	Higher water use; dries faster
Autumn and winter	Slower growth; dries slower, so overwatering risk rises
Dry, heated air	More water lost through the leaves

This is why a weekly rule that works in July can rot roots in January. Keep checking the mix, especially as days shorten.

What water to use

The RHS recommends rainwater or filtered water at room temperature. It notes that tap water in hard-water areas is alkaline, which can harm these acid-loving plants. NC State also lists rainwater or purified water as best for the genus.

Avoid cold water. The RHS anthurium overview says anthuriums can be damaged by cold water, so let it reach room temperature first.

For more on hard water and chlorine, see our guide to tap water for houseplants.

Signs the rhythm is wrong

UF/IFAS Extension links anthurium symptoms to watering in its problem table:

• Too much water: yellowing older leaves with damaged roots. Water less often and use an airy mix.
• Too little water: tip burn, root damage and reduced growth. Water more often.

If leaves droop while the mix is still wet, do not add more water. Check the roots first. Our guide to telling overwatering from underwatering walks through the checks.

Set the plant up to need less guesswork

• Use a pot with a drainage hole. The RHS recommends moving up only one pot size at a time, because an oversized pot stays wet too long.
• Use an open mix. The RHS suggests two parts ericaceous peat-free compost, one part perlite and one part orchid bark.
• Keep the plant warm. The RHS gives 18–30 °C (65–86 °F), away from cold draughts and radiators.

The anthurium hub collects our other anthurium pages, and the varieties guide covers how flowering and velvet-leaf types differ.

Related guides

Other anthurium problems we cover: overwatering, spider mites treatment, common problems, brown spots, not blooming.

References

• NC State Extension Gardener Plant Toolbox: Anthurium andraeanum
• RHS: How to grow anthuriums
• RHS: Anthuriums
• UF/IFAS Extension: Cultural Guidelines for Commercial Production of Interiorscape Anthurium (EP159)
• Virginia Cooperative Extension: Properly Watering Container Houseplants (SPES-804)
• Clemson Cooperative Extension HGIC: Anthurium, Easy Houseplants That Offer Long-Lasting Color