Gadenin日本語Get the appThe droop is a signal, not a schedule
A peace lily wilts more dramatically than almost any other houseplant. The leaves go from upright to lying flat over the rim of the pot in a few hours, and they stand back up within two to twelve hours of watering. Because the recovery is so complete, plenty of people end up using the collapse as their reminder to water.
That works, and it does not damage the plant once or twice. Used as a routine it does real harm: every collapse means the fine root hairs have dried and died back, and a plant repeatedly taken to that point loses vigor, browns at the leaf tips and stops flowering. Aim to water at the point just before the droop, and use the droop only as a signal that you left it too long.
| What you see | What it means | What to do |
|---|---|---|
| Leaves softening, losing their gloss | The right moment to water | Water until it runs from the base |
| Leaves flat over the pot rim, compost dry | Left too long, roots dried back | Water now, and shorten the interval |
| Leaves flat, compost wet | Root rot, not thirst | Stop watering, check the roots |
| Droops, waters, droops again in two days | The pot is root bound | Read the repotting guide |
A plant that does not stand up again within a day of a thorough watering is not thirsty. Slide it out of the pot and look at the roots before you water it again.
How to tell it is time
The compost surface dries long before the middle of the pot does, so what you can see is close to useless on its own. Use two of these together and you will be right nearly every time.
- Finger to the second knuckle Push a finger straight down at the edge of the pot. If it is dry and crumbly at your fingertip, water. If it is cool and damp, wait two or three days and check again.
- Learn the weight Lift the pot just after watering, then again a week later. The difference is obvious once you have felt it, and weight tells you about the whole pot rather than one spot.
- Watch the gloss A well watered peace lily leaf is stiff and glossy. The first thing to go is the shine: the leaf looks slightly matt and feels softer to the touch. That is your cue, a day or two ahead of the collapse.
- A skewer in the pot Push a wooden skewer halfway down and pull it out. Dark and damp means wait. The most reliable check in a large pot.
Rough intervals through the year
These assume a pot around eight inches (21 cm) across in an ordinary living room. A plastic pot or a shaded corner runs slower, terracotta and a bright window run faster. Adjust from what the compost is doing, not from the calendar.
The single most useful record you can keep for a peace lily is the date of each watering alongside the room temperature. After two or three months you will see your own plant's rhythm, and it will be different from any figure printed on a label. Write down the dates of any collapse too: if the gap that used to be comfortable now ends in a droop, the plant has filled its pot and needs repotting rather than more water.
| Season | Room temperature | Interval | How to water |
|---|---|---|---|
| Spring | 59 to 75F (15 to 24C) | Every five to seven days | Thoroughly, until it drains |
| Summer | Above 77F (25C) | Every three to five days | Morning, and empty the saucer |
| Autumn | 59 to 68F (15 to 20C) | Every seven to ten days | Stretch the gap gradually |
| Winter | 50 to 60F (10 to 16C) | Every ten to fourteen days | Tepid water, on a mild morning |
Reduce the frequency in winter, not the amount. A half watering wets the top of the pot and leaves the lower roots dry, which is the worst of both.
Water it properly when you do
Small, frequent top-ups are the habit that produces a peace lily with brown tips and no flowers. The lower half of the rootball never wets, salts build up in the compost, and the roots that matter most sit permanently dry.
- Water until it runs out Pour slowly around the whole surface until water comes freely from the drainage holes. That is the only way to know the bottom of the pot is wet.
- Empty the saucer within the hour Water standing under the pot keeps the base of the compost saturated, which is where root rot and fungus gnats begin. Tip it away every time, and especially in winter.
- Lift it out of the cachepot Watering a plant while it sits inside a decorative outer pot hides the water collecting in the bottom. Take it out, water, let it drain for ten minutes, put it back.
- Rehydrate a bone dry pot by soaking If the compost has shrunk from the sides and water runs straight down the gap, stand the pot in a few inches of water for twenty to thirty minutes and let it drink from below. Then drain it fully.
Brown tips are usually about water quality
Peace lilies are more sensitive than most houseplants to fluoride, chlorine and dissolved salts, and the symptom is a dry brown tip with a thin yellow margin between the brown and the green. It is cosmetic rather than dangerous, but it tells you something is accumulating.
Three things cause it, often together: hard or heavily treated tap water, fertilizer residue from feeding too often or too strong, and chronic underwatering that concentrates whatever is in the pot. Fix all three and new leaves come out clean, though the damaged ones never repair.
- Let tap water stand Leaving water out overnight lets chlorine gas off. It does nothing for fluoride or hardness, but it is free and it helps.
- Use rainwater or filtered water If your water is hard or fluoridated, switching is the single most effective change. Collected rainwater is ideal and costs nothing.
- Flush the pot twice a year Run water through the pot for a couple of minutes, letting it drain freely, to wash accumulated salts out. Do this in spring and again at the end of summer.
- Trim to shape Cut the brown tip off following the natural outline of the leaf, leaving a hairline of brown. Cutting into green tissue just creates a new brown edge.
Brown tips on a few leaves with everything else healthy is a water quality issue. Brown tips together with yellowing and a sour smell from the pot is root rot, and that is a different problem.
Humidity, misting and what actually helps
A peace lily comes from a humid forest floor and does noticeably better above about fifty percent humidity. In a heated room in winter, indoor humidity can fall below thirty percent, and that is when tips brown fastest even with perfect watering.
Misting raises humidity around the leaves for a matter of minutes, so as a humidity measure it is close to useless. It is still worth doing for two other reasons: it washes dust off the large flat leaves so they photosynthesise properly, and wetting the leaf undersides suppresses spider mites, which thrive in exactly the dry warm air that browns the tips.
- Group your plants Several plants standing together raise the humidity in their own small pocket of air, and it holds. This works better than misting and takes no effort.
- Use a pebble tray Stand the pot on stones in a tray of water, with the pot base clear of the water. Evaporation raises local humidity without the pot ever sitting wet.
- Move it away from the heater A direct draft of hot dry air will brown the tips of a well watered plant within a fortnight. Position matters more than any humidity gadget.
- Wipe the leaves monthly Support each leaf with one hand and wipe both faces with a damp cloth. Dust on a peace lily leaf measurably cuts the light reaching it.