February is a liminal month for houseplants. The days are noticeably longer than they were in December — you can feel it in the afternoon light — but most tropicals are still in dormancy, and the worst spider mite conditions of the year are happening right now in your heated, dry apartment. This is a month for watching closely and holding the line on winter care, not for experimenting.

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What's happening to your plants in February

By mid-February in the Northern hemisphere, day length has increased by roughly 45–60 minutes compared to the solstice. That is a meaningful change, and the plants that respond most quickly to photoperiod — pothos, heartleaf philodendron, tradescantia — may show their first faint signs of new growth by the end of the month. I usually notice it as a swelling at a node tip rather than a fully unfurled leaf.

Most tropicals, however, are still in what I'd call late dormancy. Monstera deliciosa, snake plant, ZZ plant, fiddle leaf fig — these are not moving yet. Their soil is still absorbing water slowly. Their leaves are not expanding. If you mistake the longer days for a signal to resume summer care, you will water too much and fertilize too soon, and you'll undo the careful restraint you practiced in January.

The physiological reality, per NC State Extension, is that tropical foliage plants respond to light intensity and photoperiod together — longer days help but are insufficient without corresponding light intensity. February's sun angle is still low, and cloud cover in many parts of the Northern hemisphere makes February one of the cloudiest months of the year. The plants know the difference between a long cloudy day and a genuinely bright day.

Southern hemisphere readers: your February is equivalent to our August — peak late-summer growth, your last repotting opportunity before fall.

Light this month

February light is a step up from January, but only a modest one. The sun's angle is rising, which means south-facing windows are becoming slightly less penetrating (the sun is no longer cutting as far into the room as it did in January) but east and west windows are starting to receive more direct light.

South-facing windows remain the best position for light-hungry plants through February. The transition away from peak south penetration hasn't happened yet in most of the Northern hemisphere — February is still a south-window month.

East-facing windows are waking up. By late February, east-facing windows in many regions are receiving noticeably more direct morning sun than they did in January. This is a good time to begin consolidating plants with moderate light requirements near east windows.

North-facing windows remain essentially unusable for anything other than the most shade-tolerant plants — cast iron plant, ZZ plant on a good day, perhaps a very tolerant heartleaf philodendron.

One practical adjustment worth making in February: look for places to temporarily boost light while keeping plants in the same general area. Placing a plant on a stool or plant stand rather than on the floor can gain several feet of elevation closer to the window, which matters when light is still weak and coming from a low angle.

If you use grow lights, maintain them through February. There is no reason to reduce supplemental lighting this month.

Watering adjustments

February watering guidance is essentially the same as January: water less than you think you need to, and let soil dry more thoroughly between waterings than you would in any warmer month.

The one adjustment I begin making in February is to watch for the early-responder plants that may begin taking up a slightly increased amount of water as new growth emerges. A pothos that has a new leaf unfurling needs a bit more water than a pothos that is completely dormant. But the key word is "slightly" — we are not shifting to spring watering yet.

For succulents, cacti, and dormancy-specialist plants like ZZ plant, February watering is minimal. Once, possibly twice, for the month. These plants are storing water in rhizomes and leaf cells, and they do not need your help.

For actively growing tropicals (if any of yours are showing early growth), check soil more frequently than you would for dormant plants. A plant with active new leaves is using more water than one that isn't.

Use the watering frequency calculator to dial in your specific situation — pot size, soil type, light level, and temperature all affect how quickly soil dries.

Humidity

February is peak spider mite season, which is directly tied to indoor humidity. The same heating-dried air that's been running since November is still running, still removing moisture from your indoor environment, and still creating the warm, dry conditions that spider mites prefer.

Per NC State Extension, maintaining qualitatively higher humidity around tropical foliage plants reduces stress and makes them less hospitable to pests. This is not just a comfort measure — it is a pest-prevention measure.

If you set up pebble trays in January, keep them filled with water. If you didn't, now is a good time to do it, specifically because of spider mite risk. The plants most vulnerable to mite damage in dry air — calathea, monstera, fiddle leaf fig — are also the ones that benefit most from localized humidity.

Heating systems typically run hardest during cold snaps, and February cold snaps are common throughout the Northern hemisphere. When the furnace is running at full capacity for days at a time, even well-humidified rooms can experience significant dips in relative humidity. Monitor your plants' leaf tips as an early indicator — new brown tip development on calathea or prayer plants during a cold snap often means the humidifier needs to run more frequently.

Pest pressure this month

February is the worst month of the year for spider mites (Tetranychus urticae) in my experience. The conditions that favor them — warm temperatures combined with very low humidity — have been building since November and are fully established by February. Per UC IPM, spider mites can complete a generation in less than a week under warm, dry conditions, which means populations that seemed manageable in January can explode in February.

Where to look: undersides of leaves on monstera, fiddle leaf fig, heartleaf philodendron, and calathea. The telltale signs are fine stippling or bronzing on the upper leaf surface (where the mites have been feeding from below), and fine silken webbing at leaf nodes and stem junctions in heavier infestations. Run a white piece of paper under a suspect leaf, tap the leaf, and look at the paper — you'll see moving specks if mites are present.

Fungus gnats may persist if you overwatered in January. If you see small dark flies around your plants or rising from the soil when you disturb it, the breeding habitat is still there. The fix is still the same: let soil dry more thoroughly. Fungus gnat adults are largely harmless but the larvae can damage roots. Yellow sticky traps help reduce adult populations.

For detailed identification help, see spider mites vs thrips vs whiteflies.

Tasks for this month

Plants to focus on this month

Heartleaf philodendron (Philodendron hederaceum)

Heartleaf philodendron is one of the first tropicals I watch in February because it often shows the first sign of the season's new growth — a small cataphyll (the papery sheath that protects emerging leaves in philodendrons) swelling at a node tip. It's a reliable early indicator that longer days are having some effect.

In February, I keep my heartleaf philodendron slightly more moist than my pothos — "slightly moist" is the NC State preference for this species (NC State Heartleaf Philodendron), meaning I check it a bit more frequently and don't let it dry as completely between waterings. This preference holds through dormancy.

Toxicity note: heartleaf philodendron is toxic to cats and dogs via insoluble calcium oxalates per the ASPCA Heartleaf Philodendron entry.

Monstera deliciosa (Monstera deliciosa)

Monstera is not quite ready to grow in February, but February is when I start watching it. The new growth point on a monstera — a tightly rolled new leaf emerging from the center of the plant — is unmissable once it appears. In my collection, it usually shows up in mid-to-late March, but I start paying attention in February.

For now: hold watering at winter levels. Monstera in low-light winter conditions should be watered infrequently, allowing the top several inches of soil to dry before watering again. Monstera in February is also a prime spider mite target — check the undersides of its large leaves.

Monstera is toxic to dogs and cats via insoluble calcium oxalates per the ASPCA Swiss Cheese Plant entry.

Golden pothos (Epipremnum aureum)

Pothos is likely to be your first actual new-growth sighting of the season. I have consistently seen pothos nodes swell and begin pushing leaves in the last week of February in my experience, which tells me this plant is more responsive to increasing photoperiod than most.

When you see the first new leaf emerging, you can begin very slightly increasing your watering frequency — still less than summer levels, but the plant is telling you it's using more water. Pothos prefers to dry out between waterings per NC State Extension, so wait for that first emergence before adjusting.

Toxic to dogs and cats per the ASPCA Golden Pothos entry.

Calathea (Calathea spp.)

Calathea is the plant most likely to be struggling in February, and it's worth giving it specific attention. Its need for high humidity combined with the peak dry-air conditions of late winter make it a reliable indicator of whether your humidity management is working. If your calathea's leaf edges are browning aggressively and new leaves are emerging rolled or distorted, your air is too dry.

The intervention in February: relocate the calathea closer to a pebble tray or humidifier, and confirm the humidifier is running enough. Calathea will also show spider mite damage earlier than many other plants — the mottled, stippled look on upper leaves is often confused for the natural calathea leaf pattern, so look closely.

The ASPCA lists Calathea as non-toxic to cats and dogs, which makes it one of the genuinely safe large tropical plants for pet owners.

Snake plant (Sansevieria trifasciata)

Your snake plant is still perfectly dormant in February. It does not need anything from you except to be left alone. If you watered it in January, check whether the soil is fully dry before watering again. In many setups, a January watering carries a snake plant all the way through February without needing another drink. This is normal and fine.

Toxic to dogs and cats via saponins per the ASPCA Snake Plant entry.

What NOT to do this month

Do not repot yet. March is the earliest I repot, and even that is on the early side for plants still showing no growth. Repotting a fully dormant plant in February just creates root disturbance with minimal upside.

Do not fertilize. I know it's tempting when you see the first signs of life on a pothos node. But one swelling bud does not mean the plant is ready to process fertilizer. Wait until you have clearly emerged, unfurled new leaves, and even then, start with quarter-strength application.

Do not assume spider mites are gone. Even if you treated in January, check again now. Spider mite populations do not voluntarily leave dry, warm conditions. An incomplete treatment in January means you likely have a small surviving population ready to explode in February.

Do not start moving plants around to experiment with positioning. Light is still weak enough that disrupting a plant that has found its equilibrium can set it back. Wait until March when there is more light to recover with.

Do not increase watering frequency across the board because the days are longer. Adjust individual plants based on what you observe — soil moisture, new growth emergence, root-bound status. Don't apply a blanket schedule change.

Frequently asked

Should I start fertilizing when I see the first new leaves in February?

Not yet. The first sign of new growth — a swelling node, a cataphyll emerging — means the plant is transitioning, not that it's in full spring mode. If you fertilize too early, you add salts to soil that may still be draining slowly in cold conditions, and you risk root burn. My rule: wait until a new leaf has fully unfurled and expanded. For most plants in February, that means you are still a few weeks away. Start at quarter-strength and build from there.

My calathea looks terrible in February. Is it dying?

Probably not — calathea in winter is almost always suffering from low humidity rather than a disease or root problem. If the symptoms are brown, crispy leaf edges and tips, curling leaves, and otherwise normal soil moisture, the diagnosis is almost certainly dry indoor air. Relocate closer to a humidifier or pebble tray. Trim the crispy tips and edges with clean scissors if you want — removing the dead tissue does not hurt the plant. New leaves that emerge will be healthier if humidity is improved. If the plant has mushy stems, yellowing throughout, and soggy soil, that's root rot from overwatering — different problem, different solution.

I see tiny flies around my plant soil. Is this a crisis?

Fungus gnats. They are annoying but not usually a crisis unless the infestation is severe enough that larvae are densely colonizing the root zone. The fix: let soil dry more thoroughly between waterings to eliminate the moist conditions the larvae need. Sticky yellow traps catch adults. If the infestation is significant, a top dressing of fine sand or grit discourages adults from laying eggs. Hydrogen peroxide soil drench (one part 3% hydrogen peroxide to three parts water) kills larvae without harming plant roots. Most February fungus gnat infestations are a consequence of January overwatering and resolve when watering habits change.

Sources: NC State Extension Plant Toolbox, NC State Heartleaf Philodendron, NC State Pothos, UC IPM Spider Mites, ASPCA Heartleaf Philodendron, ASPCA Swiss Cheese Plant, ASPCA Golden Pothos, ASPCA Calathea, ASPCA Snake Plant