Half my plant collection has died over various winters. The other half got killed by spring, ironically — that’s a different post. But the winter losses taught me something useful: most indoor plants in Australian apartments don’t die from cold. They die from the things that go wrong when the cold comes and we change our behaviour around them.

A practical guide to keeping your indoor plants alive through the cooler months.

The actual problems in Australian winters

Australian apartment winters aren’t cold by global houseplant standards. Most of the country sits in a climate that’s well within the comfort range of common indoor plants. Sydney indoor minimum temperatures are typically 16-19°C in winter. Melbourne is a few degrees cooler. Even Hobart apartments are usually above 12°C indoors with heating.

The plants aren’t dying from temperature. They’re dying from:

Overwatering. The plant’s growth slows in winter. Its water needs drop dramatically. If you maintain the same watering schedule you used in summer, you’ll waterlog the roots and trigger root rot. This is the number one killer of Australian indoor plants in winter.

Heating-induced dryness. Reverse-cycle air-conditioning running on heat dries the indoor air aggressively. The humidity in a heated apartment can drop to 25-35%, well below what most tropical houseplants need. The plant looks like it needs more water (because it’s wilting), so people water more (which makes the root rot worse), and the plant dies confused.

Light insufficiency. Australian winter days are shorter and the sun angle is lower. Plants positioned by windows in summer can find themselves in dim conditions through winter. The plant slows, weakens, and becomes vulnerable to pest infestation.

Position changes that aren’t thought through. People move plants away from cold windows toward heat sources, then wonder why the plant’s leaves crisp up. Direct heater airflow is brutal for most houseplants.

What to actually do

Cut watering back hard. The single most important winter adjustment. Most indoor plants need maybe a third of their summer water in winter. Check the top 3-4cm of soil before watering. If it’s still damp, wait. The plants that need consistent moisture (ferns, calatheas) are exceptions — but even they need less than summer.

Manage humidity, not temperature. A 16°C apartment with 55% humidity is more pleasant for most houseplants than a 22°C apartment with 30% humidity. If you can’t run a humidifier, group plants together to raise local humidity, and put pebble trays under the larger pots.

Move plants toward light, not toward heat. A north-facing window (in the southern hemisphere) is the brightest indoor position in winter. Plants that were happy in an east-facing position in summer often need to move to north-facing for winter. Don’t put plants near heater vents.

Stop fertilising. The plant isn’t growing actively. Adding nutrients it can’t use just builds up salt in the potting mix and stresses the roots. Resume fertilising in early spring when you see new growth starting.

Check for pests weekly. Indoor winter conditions are ideal for spider mites, mealybugs, and several scale species. Catch infestations early. The pest problem you ignore in June becomes the plant disaster in August.

Plant-specific notes

A few notes on common indoor plants that have specific winter requirements in Australian conditions.

Fiddle leaf figs. The drama queens of indoor planting. They drop leaves when stressed, often in response to humidity changes, draughts, or position moves. Keep them in stable conditions, water sparingly, and accept they’ll look slightly sad through winter. They recover quickly in spring if the root system is healthy.

Monsteras. Pretty tolerant of winter conditions. The main risk is overwatering. Let the soil dry out meaningfully between waterings. New leaves slow or stop through winter; this is normal.

Pothos and philodendrons. Among the most winter-tolerant common houseplants. They handle low light, lower humidity, and reduced watering well. Main winter risk is mealybug infestation in the leaf axils.

Snake plants. Practically indestructible through winter. The main risk is overwatering. Water once a month at most through winter. Cold draughts can damage the leaves but the plant generally survives even significant adverse conditions.

Ferns. The high-maintenance category. Most ferns need consistent moisture and humidity that’s difficult to maintain in a heated apartment. Bathrooms are often the best winter position for ferns. If you have a fern dying in your living room, move it to the bathroom and see what happens.

Calatheas and prayer plants. Like ferns, these want humidity. They also prefer warmer winter conditions than most other houseplants. They’re not great choices for Melbourne or Tasmanian apartments without active humidity management.

Cacti and succulents. Want bright light and minimal water through winter. Most species actually need a cool, dry winter dormancy to flower well in spring. Resist the urge to coddle them. They’re happier ignored than fussed over.

Orchids (phalaenopsis). Most are in active growth or building toward flowering through Australian winter. Maintain normal watering but check that the bark medium dries between waterings. The cool night temperatures of winter actually help trigger blooming for many varieties.

Pest management

The pest issues that emerge in winter are predictable. A few specific patterns:

Spider mites. Thrive in the dry conditions of heated apartments. Look for fine webbing between leaves and faint stippling on the upper leaf surface. Treat with horticultural oil or insecticidal soap, paying close attention to leaf undersides where they live.

Mealybugs. Show up as white cottony patches in leaf axils and on stem joints. Easily controlled if caught early with a cotton bud dipped in rubbing alcohol. Untreated, they multiply rapidly.

Scale insects. Various species, all looking like small bumps on stems and leaves. They’re under the bump, not on top of it. Scrape off with a fingernail or treat with horticultural oil.

Fungus gnats. The flying nuisance from over-moist soil. Let the soil dry out properly between waterings — this is the single most effective control. Sticky yellow traps catch the adults. The larvae in the soil are the actual damaging stage.

What to plan for spring

The work you do at the end of winter sets up the season. Specifically:

Repotting. Late winter (around August in southern Australia) is ideal for any plant that’s been root-bound. The plant comes out of winter dormancy into a fresh root environment and grows strongly.

Pruning. Most plants tolerate winter pruning better than summer pruning. The wound heals over slowly through the dormant period and the spring growth is from a tidier baseline.

Pest control. If you’ve had pest issues through winter, the late-winter resolution is much easier than waiting for spring. The pest populations are still small and the plants haven’t put on new growth that hides infestations.

Soil top-up. Adding fresh potting mix to the top of established pots refreshes the nutrient supply and improves the soil structure for spring growth.

The plants don’t need much from you in winter. The mistake most apartment dwellers make is doing too much, not too little. Reduce watering, manage humidity, hold off on fertiliser, move toward light. The plants that get through winter quietly come into spring strong. The plants that get fussed over often go into spring weakened, even if they look fine in May.