How often to water monstera: use the soil test

There is no fixed interval, only a test

Nobody can tell you how often to water your monstera (Monstera deliciosa), because the answer depends on your pot, light and growing medium. The same plant in a 15 cm (about 5.9 in) terracotta pot beside a large window uses water three times faster than its twin in a 30 cm (about 11.8 in) plastic pot two meters (about 6.6 ft) from the window.

That leaves one reliable method: push your index finger 2 to 3 cm (about 0.8–1.2 in) into the growing medium. If it is dry throughout that depth, water. If it is still moist or sticks to your fingers, wait two days and test again.

The second check is just as useful: the weight of the pot. Lift it just after watering, then again four or five days later. The difference is clear. After three or four cycles, your hand recognizes a dry pot without touching the soil. This is especially valuable for large plants, where the surface dries well before the bottom.

Water thoroughly in one go, until it drains

Water a monstera in one generous session, until water comes out through the pot's drainage holes. Pour slowly across the entire surface of the growing medium, rather than into one corner, and stop as soon as excess water runs out.

This drainage serves two purposes. It ensures that the root ball is moistened throughout its depth, including the roots at the bottom that do most of the work. It also flushes out mineral salts accumulated from fertilizer and tap water, which form the whitish crust on the surface.

The opposite habit, half a glass every two days, creates exactly what you want to avoid: a constantly damp upper layer, a bottom that never gets wet again, and roots confined to the top ten centimeters (about 3.9 in).

A pot without a drainage hole makes all this impossible. If your monstera sits in a sealed decorative container, keep it in a nursery pot with holes inside and lift that out for watering.

Always empty the saucer

Let the pot drain thoroughly, then empty the saucer. Water left in the saucer no longer benefits the growing medium: it only drowns the roots at the bottom.

Approximate seasonal intervals

Allow roughly one watering a week in summer and one every 10 to 14 days in winter, where those seasons correspond to active growth and winter slowdown. These figures are a starting point to adjust using the finger test, never a rule. Match the periods below to your local light and growth conditions.

Period	Approximate interval	What changes
Spring and summer	About 7 days	Active growth, long daylight hours, rapid evaporation
Autumn	About 10 days	Growth slows and the growing medium dries more slowly
Winter	10 to 14 days, sometimes longer	Little light, almost no growth, reduced needs

Heating complicates matters: it dries the air without increasing the roots' water consumption. Leaves may need more humidity while the root ball is still wet. In that case, mist or move a humidifier closer, but do not water.

Too much or too little water: different signs

Many gardeners water a plant already suffering from overwatering because its leaves droop in both cases. The table below distinguishes the two sets of symptoms.

Sign	Overwatering	Underwatering
Yellow leaves	Soft, widespread yellowing, often at the bottom	Uncommon; edges are more often dry and brittle
Plant posture	Collapsed and does not recover after watering	Drooping, then straightens within a few hours of watering
Growing medium	Waterlogged for several days	Shrunken and pulled away from the pot walls
Smell around the pot	Stagnant soil, sometimes sour	None
Stem bases	Soft and brown	Firm

The simplest test is recovery: a thirsty plant straightens within six to twelve hours of thorough watering. An overwatered plant stays the same or continues to deteriorate. In the latter case, stop watering and consult the overwatering guide before considering taking it out of its pot.

Bottom watering: useful, but not the only method

It is mainly useful when the growing medium has become water-repellent, meaning that water poured from above slides down the sides and comes out within ten seconds without wetting the root ball. The classic sign is shrunken soil with a gap between it and the pot.

Stand the pot in a basin containing 3 to 5 cm (about 1.2–2 in) of water and let it absorb water for 20 to 30 minutes, until the surface feels moist. Then lift it out and let it drain.

Its limitation is the direction of water movement. Entering only from below, water flushes nothing out: mineral salts rise and concentrate at the surface, where they eventually burn shallow roots. Plan a conventional watering from above, until water flows freely out, every three or four cycles.

Which water to use

Tap water is suitable in the vast majority of cases, on two conditions: leave it standing uncovered for 24 hours so the chlorine evaporates, and use it at room temperature. Cold water straight from the tap shocks tropical roots, particularly in winter.

In very hard-water areas, a whitish deposit forms on the growing medium's surface and around leaf edges. Monstera tolerates this better than many houseplants, but alternating with rainwater limits the build-up. Avoid water treated by a domestic water softener: it exchanges hardness minerals for sodium, which roots tolerate poorly.

Semi-hydroponics and stems kept in water

A monstera grown in clay pebbles or lava rock is maintained at a water level rather than watered conventionally. The reservoir should cover a quarter to a third of the container's height, never more: the upper roots stay exposed to air, allowing them to breathe. Let the reservoir empty completely before refilling, renewing the oxygen around the roots.

Fertilizer is essential with this method because the inert medium supplies nothing. A hydroponic solution diluted to half strength at each refill during the growing period is enough.

A simple stem in a vase survives for a long time but makes little progress. Without nutrients, it produces smaller and smaller leaves over the months. Change the water weekly to prevent bacterial growth, and plan to move it into growing medium or semi-hydroponics once its roots exceed 5 cm (about 2 in).