Peace lilies (Spathiphyllum) are the plant most often recommended to beginners, and for good reason. They’re forgiving, they flower indoors, and they tell you when they’re thirsty by drooping dramatically — then perk right back up after watering. I’ve had a large peace lily on my Melbourne balcony for six years, and it’s gone through heatwaves, neglect, overwatering, and a questionable repotting job. Still alive, still flowering.

But there’s a difference between a peace lily that’s surviving and one that’s genuinely thriving. Most of the ones I see in people’s homes are okay — alive, some green leaves — but they could look much better with a few adjustments.

Light

This is where most care guides get it wrong. They say peace lilies are “low light plants.” They tolerate low light. They don’t love it.

A peace lily in a dim corner will survive but it won’t flower, and its growth will be slow and sparse. Move that same plant to a bright spot (indirect light, no direct sun) and the difference within a few months is dramatic — more leaves, bigger leaves, and actual flowers.

Best spot: Within 1-2 metres of an east or north-facing window (in the southern hemisphere). Bright enough to read a book without turning on a lamp. That’s the sweet spot.

Avoid: Direct afternoon sun, which scorches the leaves — you’ll see brown, crispy patches if the sun hits them. Morning sun (before about 10am) is usually fine and can actually boost flowering.

I keep mine in a spot that gets bright indirect light most of the day with about an hour of gentle morning sun. It pushes out flowers consistently from spring through autumn.

Watering

Peace lilies are the drama queens of the plant world. When they’re thirsty, they droop their entire body in a display that makes you think they’re dying. Water them, and two hours later they’re standing bolt upright like nothing happened.

How often: Don’t water on a schedule. Water when the top 2-3cm of soil is dry. In summer on my balcony, that’s every 3-4 days. In winter, it’s every 7-10 days. The frequency varies with temperature, humidity, and pot size, so checking the soil is always more reliable than counting days.

How much: Water thoroughly until it runs from the drainage holes. This ensures the entire root zone is moistened, not just the surface layer. Pour slowly and let the water soak in rather than running straight through.

The drama droop: If your peace lily droops, it’s telling you it needs water. It’s not dying — this is normal behaviour. Water it immediately and it’ll recover within a couple of hours. However, repeatedly letting it droop stresses the plant over time. Occasional drooping is fine; regular drooping means you’re watering too infrequently.

Water quality: Peace lilies are sensitive to chlorine and fluoride in tap water. If your tap water is heavily treated, you might notice brown leaf tips. Leaving water in an open container overnight lets the chlorine evaporate. Or use rainwater if you collect it. In Melbourne, our tap water is decent and I’ve never had issues using it straight.

Humidity

Peace lilies are tropical plants that appreciate humidity above 40%. Melbourne’s air is usually fine in warmer months but gets dry in winter, especially with heating running.

Signs of low humidity: brown, crispy leaf edges that aren’t caused by underwatering or sunburn.

Solutions: Group plants together (they create a microclimate of slightly higher humidity). Place the pot on a tray of pebbles with water — the evaporating water raises humidity around the plant. Mist the leaves in the morning. Or just put it in the bathroom if you have a window in there.

Feeding

Peace lilies aren’t heavy feeders. Over-fertilising is more common than under-fertilising and causes brown leaf tips and edges, salt buildup on soil, and generally unhappy plants.

What to use: A balanced liquid fertiliser diluted to half the recommended strength. I use Powerfeed or Seasol mixed at half dose.

How often: Once a month during spring and summer. Nothing during autumn and winter when the plant is growing slowly.

If in doubt, don’t feed. A peace lily that’s never fertilised will still grow — just slower. A peace lily that’s overfertilised will show damage. Err on the side of less.

Flowers

Peace lily “flowers” are actually a spadix (the yellow/cream spike) surrounded by a spathe (the white hood). They’re beautiful and can last 4-6 weeks before gradually turning green, then brown.

To encourage flowering:

• Give it enough light. This is the number one factor. A peace lily in a dim corner won’t flower regardless of what else you do.
• Feed it during growing season. Phosphorus supports flowering — most balanced fertilisers contain enough.
• Let it become slightly rootbound. Mildly rootbound peace lilies tend to flower more than freshly repotted ones. This is well-documented across the University of Florida’s Environmental Horticulture research.

Brown flowers: Once the spathe turns brown, cut the entire flower stem down to the base of the plant. This redirects energy to new growth rather than a spent flower.

Common Problems

Brown leaf tips

The most common peace lily complaint. Almost always caused by one of these:

• Low humidity (crispy, dry brown edges)
• Tap water chemicals (fluoride is the usual culprit)
• Over-fertilising (salt burn)
• Underwatering (dehydration damage)

Identify the cause and address it. You can trim the brown tips off with scissors for a tidier appearance — cut at an angle to mimic the natural leaf shape.

Yellow leaves

A few yellow lower leaves are normal — the plant naturally sheds old leaves. If you’re seeing widespread yellowing, check for overwatering (soggy soil, mushy roots) or insufficient light.

No flowers

Almost always a light issue. Move it to a brighter spot and wait a season. Some peace lily varieties flower more readily than others — the dwarf varieties tend to be more generous with flowers than the large-leaved types.

Root rot

Caused by overwatering or poor drainage. Symptoms: yellowing leaves, mushy brown roots, a sour smell from the soil. If caught early, remove the plant, trim rotting roots, repot in fresh soil with good drainage, and water more carefully going forward.

Pests

Peace lilies are relatively pest-resistant. The main threats are mealybugs (white cottony clusters in leaf joints) and scale (small brown bumps on stems). Both can be treated with neem oil or rubbing alcohol on a cotton bud.

Repotting

Every 1-2 years, or when the plant is clearly outgrowing its pot (roots through drainage holes, water running straight through). Go up one pot size — 2-5cm larger in diameter.

Spring is the best time. Use a quality indoor potting mix. Don’t bury the crown (where leaves emerge from) any deeper than it was in the old pot.

Dividing

Large peace lilies can be divided when you repot. Each section needs at least 2-3 leaves and a section of root system. Pull sections apart gently or use a clean knife if the root mass is tightly bound. Pot each division into its own container and water well.

Division is the easiest way to get new peace lilies — and they make genuinely good gifts because they’re so forgiving.

Peace lilies are one of those rare plants that reward both attentive and neglectful owners. Give them decent light, water when they droop (or preferably just before), and they’ll keep producing those elegant white flowers for years. The bar for keeping one alive is low. The bar for keeping one thriving is only slightly higher.