How to Repot a Houseplant: When to Do It, What Pot to Choose and Step-by-Step Method
Roots poking out of the drainage holes or soil that dries in a day often send people searching for how to repot a houseplant. This guide shows how to tell whether your plant truly needs a new pot. You will also learn how to choose the right size and mix, and how to repot step by step without shocking the roots.
- When: spring, and only when roots have filled the pot.
- Pot size: 1 to 2 inches wider than the old one, with drainage holes.
- Mix: fresh, moist potting mix, never garden soil.
- Method: slide the plant out, loosen circling roots, set it at the same depth, fill around it, water well.
- Skip: gravel in the bottom, packing the soil down, and a pot that is far too big.
[PHOTO: The author’s own root-bound pothos lifted out of its nursery pot, roots circling the outside of the root ball.]
Does your plant really need repotting?
Repotting is not routine maintenance. University of Missouri Extension warns that any time you disturb a plant’s roots, you cause it stress. The University of Minnesota Extension puts it simply: spring is ideal for repotting, but only if your plant truly needs more space.
So the first job is to read the signs. NC State Extension calls one sign a sure indicator: roots appearing from the drainage holes or at the soil surface. Others are supporting clues that point the same way.
| Sign | How strong a signal? | What else could cause it |
|---|---|---|
| Roots growing out of drainage holes | Strong | Rarely anything else |
| Roots on the soil surface | Strong | Some plants, like many aroids, naturally grow surface roots |
| Roots circling the inside of the pot | Strong | Check by sliding the plant out gently |
| Soil dries out within a day or two | Moderate | Hot, bright spot; terracotta pot; dry winter air |
| Slow growth in spring and summer | Moderate | Low light, no fertilizer, or the plant’s natural pace |
| Lower leaves turning yellow | Weak on its own | Overwatering, low light, normal leaf ageing |
| White crust on soil or pot rim | Moderate | Fertilizer salt build-up; may only need flushing or a top-up |
Signs compiled from NC State, University of Minnesota and University of Missouri Extension.
The two-minute root check
If the clues are unclear, look at the roots themselves. Water the plant the day before so the root ball holds together. Turn the pot on its side, support the base of the stems between your fingers, and ease the plant out.
If you see mostly soil with a few roots, put it straight back. Your plant is fine. If roots wrap the outside of the root ball in a dense mat, it is pot-bound and ready for a bigger home.
When not to repot
- A plant you just bought. University of Missouri Extension advises waiting, because a new plant needs time to adjust to your home first.
- In the middle of winter. Most houseplants grow slowly then, so damaged roots recover more slowly too.
- A plant in flower. Root disturbance can make it drop buds. Wait until flowering ends.
- A plant that is merely struggling. If the cause is light or watering, a new pot will not fix it and adds more stress.
When to repot a houseplant: timing matters
NC State Extension recommends spring, because the plant then has the whole growing season to settle into its new pot. Longer days and warmer rooms mean roots grow out into fresh mix quickly. Early summer works too.
Emergencies are the exception. A pot that has cracked, soil that smells sour, or roots that are rotting cannot wait for spring. In those cases, repot when you notice the problem and give the plant extra gentle care afterward.
Choosing the right pot
Size: one step up, not three
NC State Extension advises a new pot no more than 2 inches wider than the old one. University of Illinois Extension recommends going up one size, roughly 1 to 2 inches in diameter. It warns against putting a small plant in a much larger pot, because the extra soil stays wet too long.
Here is why that matters. Roots take up water from the soil they can reach. In an oversized pot, the outer soil has no roots in it, so it stays soggy for days. Soggy soil means less air for the roots, which is how root rot starts.
| Current pot (diameter) | Move up to | Avoid going to |
|---|---|---|
| 4 inches (10 cm) | 5 to 6 inches | 8 inches or more |
| 6 inches (15 cm) | 7 to 8 inches | 10 inches or more |
| 8 inches (20 cm) | 9 to 10 inches | 12 inches or more |
| 10 inches (25 cm) | 11 to 12 inches | 14 inches or more |
Based on the 1 to 2 inch guidance from NC State and Illinois Extension. Measure across the top inside rim.
Drainage holes are not optional
Both NC State and Illinois Extension say to use a pot with drainage holes. Illinois notes that pots without them raise the risk of root rot. If you love a decorative pot with no hole, use it as a cover pot. Keep the plant in a plain nursery pot inside it, and lift it out to water.
Material: plastic, terracotta or glazed ceramic
Light and cheap. Holds moisture longer, so it suits thirsty plants and people who sometimes forget to water.
Porous, so soil dries faster. Good for succulents and for anyone who tends to overwater. Heavier, and it shows salt crust.
Behaves like plastic for moisture, but heavy and stable. Check for a drainage hole before you buy.
If you switch from plastic to terracotta, expect to water more often at first. The pot itself pulls moisture out of the soil.
Reusing an old pot
Old pots can carry disease and salt crust. NC State Extension suggests cleaning reused pots in a solution of one part liquid bleach to nine parts water, then rinsing thoroughly. Scrub the white salt crust off the inside rim of clay pots, too. Wear gloves, work somewhere ventilated, and never mix bleach with other cleaners.
Choosing potting mix
NC State and Illinois Extension both advise against garden soil in pots. It drains poorly in a container and may bring in pests and disease. Use a fresh, good-quality potting mix instead.
Most bagged houseplant mixes are soilless blends. University of Missouri Extension describes common ingredients as sphagnum peat, vermiculite and perlite. Illinois Extension notes that a mix of equal parts soil, peat moss and perlite or vermiculite suits most houseplants. Some plants need a special blend.
| Plant group | Mix that usually suits it |
|---|---|
| Most leafy houseplants (pothos, peace lily, dracaena) | Standard indoor potting mix |
| Cacti and succulents | Gritty cactus mix, or standard mix with extra perlite or grit |
| Orchids such as Phalaenopsis | Chunky bark mix, never ordinary soil |
| Aroids (monstera, philodendron) | Standard mix opened up with bark and perlite |
Moisten the mix before you start, as NC State Extension suggests. Dry peat-based mix repels water at first and can leave dry pockets around the roots. Damp mix also makes less dust, which matters for the safety note below.
Potting mix and compost can carry Legionella longbeachae, bacteria that can cause a type of pneumonia called Legionnaires’ disease. NSW Health advises these steps:
- Read the warning on the bag before opening it.
- Put on gloves and a face mask before you open the bag.
- Open the bag slowly, away from your face, and dampen the mix to cut dust.
- Wash your hands with soap and water afterward.
Most people exposed do not get sick. Risk is higher for older adults, smokers and people with weakened immune systems. If you develop fever, cough, shortness of breath or muscle aches within 2 to 10 days of handling soil, see a doctor and mention it.
How to repot a houseplant, step by step
Gather everything first so the roots spend as little time exposed as possible. You need the new pot, moistened potting mix, gloves, a mask, clean scissors or pruners, a table covered with newspaper, and a watering can.
Water the day before.
A lightly moist root ball holds together and slides out more easily. Bone-dry or soaking-wet roots tear more easily.
Prepare the new pot.
Cover the drainage hole with a coffee filter or a scrap of mesh to stop soil washing out. Do not add gravel. Add a layer of mix so the plant will sit at the right height.
Remove the plant without pulling the stem.
NC State Extension advises turning the pot upside down with your hand over the soil, then tapping the rim on a table edge. For plastic pots, squeeze the sides. For a stuck pot, run a knife around the inside edge.
Inspect and loosen the roots.
Healthy roots are firm and pale. If roots circle the root ball, tease them apart with your fingers. NC State notes circling roots should be cut or unwound, or they won’t grow normally into the new mix.
Trim anything dead or rotten.
Cut away roots that are brown, mushy or smell bad, using clean scissors. If old surface soil has a salt crust, scrape off the top inch, as NC State suggests.
Set it at the same depth.
Place the root ball in the center. The top of the root ball should sit about an inch below the pot rim, leaving room to water. Do not bury the stem deeper than it was.
Fill around the sides and firm gently.
Add mix around the root ball. Tap the pot on the table or press lightly to settle it. Do not pack it down. Missouri Extension explains that compressed mix holds more water and starves roots of oxygen.
Water thoroughly.
Water until it runs out of the drainage holes, which settles the mix around the roots. If the soil sinks, top it up. NC State cautions never to press the mix down once it is wet.
[PHOTO: Step 4 close-up, the author’s fingers teasing apart circling roots over a sheet of newspaper.]
The gravel myth: why a drainage layer backfires
Putting gravel, pebbles or broken pot pieces in the bottom of a pot is one of the most repeated tips in gardening. Extension experts now advise against it. NC State says research found the practice reduces drainage. University of Kentucky Extension explains the reason.
[ soil, moist ]
[ soil, SOAKED ] ← water stalls here
[ gravel ]
[ drainage hole ]
Water will not move from fine soil into coarse gravel until the soil above is saturated. The soggy zone sits higher, right where roots grow.
[ soil, moist ]
[ soil, moist ]
[ soil, wettest ] ← lowest point
[ filter + hole ]
The wettest layer sits at the very bottom, below most roots. Extra water drains straight out of the hole.
This waterlogged band is called a perched water table. Kentucky Extension notes that sand, pot shards, styrofoam and plastic bottles in the base cause the same problem. To stop soil washing out, it suggests a coffee filter or newspaper over the hole instead.
Special cases
Plants too big to move up: refresh instead
Once a plant is in the largest pot you can handle, you have two options. You can remove it, trim the outer inch of roots and replant it in the same pot with fresh mix. Or you can scrape off the top inch or two of old soil and replace it with new mix, called top-dressing.
Plants with root rot
Rotting roots are dark, soft and smell sour. Remove all the old soil, cut every soft root back to firm tissue, and repot into fresh mix in a clean pot. Choose a pot just big enough for the remaining roots, not bigger. Water lightly at first, then let the top of the soil dry before watering again.
Plants with several stems: divide them
Clumping plants, such as peace lilies and many ferns, can be split into smaller plants while you repot. Gently pull or cut the root ball into sections, each with its own roots and shoots. Plants that make offsets, like the spider plant, can be separated at the same time.
Plants growing in water
Some plants are often sold growing in water rather than soil, such as lucky bamboo. They do not need repotting in the usual sense. Rinse the container, refresh the water and trim any slimy roots instead.
Aftercare: the first weeks after repotting
A freshly repotted plant needs a calm recovery period. Its roots are settling and may have lost some fine root hairs. These habits help it bounce back.
- Bright, indirect light. Keep it out of harsh direct sun for a week or so while the roots recover.
- Check before you water again. The University of Minnesota Extension suggests watering when the soil feels dry about an inch down. Fresh mix can hold water longer than old, root-filled soil.
- Empty the saucer. Missouri Extension advises emptying saucers soon after watering so the mix does not soak water back up.
- Hold off on fertilizer. Many bagged mixes already contain fertilizer, so check the label. Missouri Extension warns that overfeeding a stressed plant raises salt levels and can injure it.
- Expect a little droop. Some wilting or one or two yellow leaves in the first week is normal. Steady decline after two weeks is not.
| What you see after repotting | Likely cause | What to do |
|---|---|---|
| Mild wilting for a few days | Normal transplant stress | Keep in indirect light; don’t add more water if soil is moist |
| Soil still wet after a week | Pot too big, or mix packed down | Water less; consider a smaller pot |
| Water runs straight through, soil stays dry | Mix was dry and repels water | Water slowly in small amounts, or bottom-water for 20 minutes |
| Leaves yellowing and stems soft at the base | Root rot from overwatering | Check the roots and follow the root rot steps above |
| Plant leans or wobbles | Mix settled after watering | Top up gently; stake if needed |
Common mistakes when repotting a houseplant
- Choosing a pot that is far too big. Extra soil stays wet. Move up 1 to 2 inches at a time.
- Adding a gravel layer. It raises the soggy zone instead of improving drainage.
- Using garden soil. It compacts in pots and can bring pests and disease.
- Pulling the plant out by its stem. Tip, tap or squeeze the pot instead.
- Burying the stem deeper. Keep the plant at the depth it was growing.
- Packing the soil down hard. Firm gently and let watering settle it.
- Repotting a struggling plant to “fix” it. Check light and watering first.
- Repotting a brand-new plant immediately. Let it adjust to your home first.
- Skipping gloves and a mask. Potting mix dust can carry bacteria.
Repotting questions people often ask
How often should I repot a houseplant?
There is no fixed schedule. Fast growers may fill a pot within a year, while slow growers can stay put for several years. Let the root check decide, not the calendar.
Should I water before or after repotting?
Both. Water lightly the day before so the root ball holds together, then water thoroughly right after repotting to settle the mix.
Can I reuse old potting mix?
It is better not to for houseplants. Old mix has broken down, compacts more easily and may hold salt build-up, pests or disease. Fresh mix is cheap insurance.
Is it normal for a plant to look sad after repotting?
A little drooping for a few days is common. Keep it out of harsh sun and avoid extra watering while the soil is still moist. If it keeps declining after two weeks, check the roots for rot.
Pets and children: keep repotting safe
Many common houseplants are toxic to cats and dogs, including pothos and dracaena. Roots and fallen leaves are easy to reach when a plant is out of its pot. Repot on a table, keep pets out of the room, and sweep up afterward.
Store fertilizer and bagged mix where children and pets cannot get to them. Some dogs eat potting mix, and fertilizer can make animals sick. Think your pet has eaten a plant or garden product? Call your vet or the ASPCA Animal Poison Control Center (888-426-4435; a fee may apply). For people in the US, call Poison Control on 1-800-222-1222.
Our care guides for golden pothos and dracaena cover each plant’s pet-safety details. You can find more plant guides in our houseplant and garden section.
Your next step
Pick the one plant you suspect is pot-bound and do the two-minute root check this weekend. If roots wrap the root ball, buy a pot no more than 2 inches wider and a fresh bag of mix. If they don’t, put the plant back and enjoy knowing it is happy where it is.
Free download
Houseplant Repotting Checklist and Pot Size Guide (PDF)
One printable page: the signs a plant needs repotting, a pot size chart and a supplies list. It also covers the 8 steps, aftercare and a repotting log.
This guide shares general houseplant care information. Plant needs vary by species and home conditions. For health concerns linked to handling soil or plants, see a doctor, and for pet poisoning, contact your vet or animal poison control right away.
Sources
- Strickland J. How to Repot a Houseplant. NC State Extension, Wayne County Center, 2022. wayne.ces.ncsu.edu/news/repotting-houseplants
- University of Illinois Extension. Houseplants: Get Started. extension.illinois.edu/houseplants/get-started
- University of Minnesota Extension. Spring into houseplant care. extension.umn.edu/yard-and-garden-news/spring-houseplant-care
- University of Missouri Extension. Houseplants can’t run away from home, so be nice to them. extension.missouri.edu
- University of Missouri Integrated Pest Management. Healthy Houseplants, 2015. ipm.missouri.edu/meg/2015/10/Healthy-Houseplants
- University of Kentucky Cooperative Extension, Mercer County. Horticulture newsletter, April 2024 (gravel and perched water tables). mercer.ca.uky.edu
- NSW Health. Steps to avoiding Legionnaires’ disease, 2018. health.nsw.gov.au
- ASPCA Animal Poison Control Center. aspca.org/pet-care/animal-poison-control