Indoor Plant Care: Light, Water, Feeding and Fixes

Taking care of indoor plants comes down to four habits: put each plant in the light it needs, water only when the top of the mix has dried, feed lightly while the plant is growing, and move it to a slightly bigger pot when the roots fill the old one. Most houseplants that die indoors are drowned, not starved: Clemson University's Home & Garden Information Center names overwatering as the cause of root rot and plant death, and notes that its symptoms look like underwatering.

For a first plant, choose one that forgives mistakes. The snake plant, spider plant and pothos all survive a missed watering, and each has its own care page on this site. The sections below cover the rules that apply to nearly every houseplant; the species pages cover the exceptions.

Light is the one thing you cannot fix with a watering can, so decide it first. Clemson HGIC sorts indoor light into four levels, measured in foot-candles, and ties each one to a window:

• Low, about 100 foot-candles. Several feet from an east or north window.
• Medium, 100 to 150 foot-candles. Within several feet of an east window.
• High, 150 to 1,000 foot-candles. West or south windows.
• Very high, over 1,000 foot-candles. Only a sunroom or greenhouse gets there.

Homestead and Chill's guide puts the same idea in plant terms: succulents and cacti want bright direct sun, most tropical houseplants want bright indirect light, and pothos and snake plant cope with moderate to low light. Where a window falls short, it suggests fluorescent or LED grow lights for 8 to 12 hours a day.

The exceptions are worth knowing before you buy. A ponytail palm wants six or more hours of direct sun (NC State Extension), while a spider plant is intolerant of direct sun. Our watering and light basics guide has more on reading a room's light.

There is no correct number of waterings per week, because the right interval depends on the plant, the pot and the room. Clemson HGIC lists the variables: the species and its growth stage, the pot (porous clay dries faster than plastic or glazed pots), how big the plant is for its pot, how much peat is in the mix, and how warm and sunny the spot is. Homestead and Chill's rough rule is about once a week for most houseplants, but only after checking.

Clemson gives four ways to check:

• Finger test. Push a finger into the mix up to the first joint; water when it feels dry. UC Marin Master Gardeners give the same threshold as the upper inch.
• Tap test. Rap the side of a clay pot: a dull sound means moist, a hollow ring means dry.
• Weight. A pot of dry mix is noticeably lighter.
• Colour. Mix darkens when wet and lightens as it dries.

When you water, water thoroughly until it runs out of the drainage holes, then empty the saucer; both Clemson and UC Marin say not to let pots stand in water. Clemson adds details most guides skip: use water between 62 and 72 F, avoid softened water because it adds sodium and chloride to the mix, and if a pot has dried out completely, water it twice about 30 minutes apart so the mix actually takes it up. It also warns not to use wilting as your only signal, because a plant with roots damaged by overwatering wilts too.

UC Marin Master Gardeners give 70 to 80 F in the day and 65 to 70 F at night as the ideal range for most houseplants, and say to keep plants out of drafts and away from heat sources. A plant pressed against a cold window pane in winter, or sitting over a radiator, is outside that range even when the thermostat is not.

Most homes are drier than tropical houseplants would like, UC Marin notes. Its three fixes are to stand pots on trays of pebbles and water, to group plants together, and to mist occasionally with distilled water. Homestead and Chill adds that most houseplants tolerate average household humidity, with occasional misting in dry climates; it singles out staghorn ferns as plants that appreciate regular misting.

Houseplants need far less fertiliser than garden plants, and only while they are growing. Clemson HGIC recommends a balanced formula such as 20-20-20 for foliage plants and a higher-phosphorus formula such as 15-30-15 for flowering plants, applied in one of three ways: at label strength every two to three months, at one-tenth strength with every watering, or at every seventh watering. It says plants resting through short winter days should get none until growth resumes in spring.

UC Marin's version is a diluted liquid fertiliser once a month in summer and nothing in winter, with a warning that overfeeding causes salt buildup and leggy growth. Clemson gives the sign to look for: a white crust on the soil surface or the rim of the pot means salts have accumulated. Flush the pot with plenty of plain water and cut back.

Every pot needs a drainage hole; Homestead and Chill calls drainage holes essential, and Clemson says to choose pots that have them. If you love a decorative pot without one, Clemson's answer is double-potting: keep the plant in a plain draining pot and set that inside the decorative one on a layer of gravel. Clay pots breathe and let the mix dry naturally, which suits succulents; plastic and glazed pots hold water longer, which suits thirstier plants.

For soil, Homestead and Chill uses bagged potting mix lightened with perlite or pumice, and a cactus mix for succulents. Repot when roots start coming out of the drainage holes, UC Marin says, ideally in late winter or spring, into a pot only about 2 inches wider, using sterile mix that you moisten before planting. Jumping to a much larger pot leaves a mass of wet soil the roots cannot reach, which is how root rot starts.

Dust on leaves blocks light. Clemson HGIC's method for smooth leaves is to wipe both sides with a soft cloth dampened with water, and to use a soft cosmetic brush on hairy leaves such as African violets. It advises against commercial leaf-shine products, because their waxy residue can interfere with the leaf's gas exchange.

UC Marin's grooming list is short: wash leaves with warm water, remove dead flowers, yellowing leaves and dead branches, and trim brown or dry leaf tips with sharp scissors. Trimming is cosmetic, though. Clemson lists what causes brown tips and edges in the first place: hot, dry air, improper watering, insect feeding and salt accumulation. Its fixes are rainwater where possible, drenching the pot now and then to wash salts out, emptying saucers, not overfeeding, and repotting periodically in fresh mix.

Most houseplant problems show up in the leaves first. This list pairs each common symptom with the causes Clemson HGIC gives for it:

• The whole plant is turning yellow. Often overwatering, but also too little light, too little fertiliser or pests. Check the soil before anything else.
• Only the lower leaves are yellowing. Usually a shortage of nitrogen or iron, especially in a plant that has filled its pot. Feed, and repot into fresh mix.
• Leaves are dropping. Either over- or under-watering, or a pot that is too small. A big change in conditions, such as a move to a new room, can cause leaf drop that Clemson says typically lasts about three weeks.
• Brown tips and edges. Dry hot air, watering, insects or salts; see the section above.
• White crust on the soil. Salt from fertiliser. Flush with plain water.
• Small flies around the pot. Homestead and Chill ties fungus gnats to soggy soil, so let the mix dry out more between waterings.

If the plant's name is uncertain, identify it first; the right fix for a succulent is the wrong one for a fern. Our guide to spotting and treating common plant pests covers insects in more detail.

Not as a top dressing for a pot. University of Minnesota Extension reports that coffee grounds have not been shown to consistently lower soil pH, so they are not a way to acidify soil. Grounds do contain carbon, nitrogen and other compounds that feed soil organisms, and the Extension calls them an excellent addition to compost, with modest amounts in the garden being beneficial.

A pot is not a garden bed. It has no worms and far less soil life to break the grounds down, and a damp layer of organic matter on the surface works against the dry-between-waterings rule above. Put the grounds in the compost, and use the finished compost when you repot.

None of the sources we opened gives a fixed number of hours or days to leave a houseplant outside. What they agree on is the method: change the light gradually. Clemson HGIC says plants moved from indoors into direct outdoor sun should be introduced to it gradually to avoid bleached or scalded leaves, and Wisconsin Horticulture gives the same advice for ponytail palms, which need gradual acclimation to prevent sunburn.

In practice that means starting in shade or morning sun and moving the plant into brighter light over a week or two, watching the leaves for pale or scorched patches. Bring it back in before nights fall below its minimum. Examples from NC State Extension: keep spider plants above 45 F, and bring ZZ plants indoors when temperatures drop below 60 F. Look over the leaves and their undersides before a plant comes back in, so you do not carry insects to the rest of your collection.

The general rules above cover most houseplants; these are the species where a single rule matters most, from the care pages on this site:

• [Snake plant](/lookup/houseplant-care/snake-plant-care). Water only every one to two months in winter (NC State Extension).
• [Spider plant](/lookup/houseplant-care/spider-plant-care). Fluoride and chlorine in tap water cause the brown tips; use distilled or rainwater.
• [Ponytail palm](/lookup/houseplant-care/ponytail-palm-care). Full sun, six or more hours a day, and very little water.
• [Monstera](/lookup/houseplant-care/monstera-plant-care). Let the top quarter to third of the mix dry, and give it something to climb.
• [Peace lily](/lookup/houseplant-care/peace-lily-care), [orchid](/lookup/houseplant-care/orchid-plant-care), [Christmas cactus](/lookup/houseplant-care/christmas-cactus-care) and [aloe vera](/lookup/houseplant-care/aloe-vera-plant-care) each have their own watering and flowering rules on their pages.

If you do not know which plant you have, a photo of a leaf and any flower is usually enough to find out; our guide to identifying a plant from a photo shows what to photograph.

Some of the most common houseplants are toxic if chewed. Homestead and Chill singles out lilies and azaleas as extremely toxic to cats; see our pages on lilies and azaleas, and the guide is my houseplant safe for cats? for how to check a plant you already own.

If a pet has chewed a plant, call your veterinarian or ASPCA Animal Poison Control on (888) 426-4435. If a child or adult has eaten part of a plant, call your local poison control centre or a doctor. Keep the plant label or a photo to hand; the species name is the first thing they will ask for.

Research and drafting for this page were done with the help of AI, and every figure was then checked line by line against the sources listed at the end of the page. Sources were opened on 2026-09-25. If you find a mistake, tell us and we will correct it.