Signs your plant needs repotting
Not every plant needs repotting on a schedule. Some like being slightly root-bound and produce better when snug. Watch for these signals instead:
- Roots circling inside the pot. Tip the plant slightly to peek through the drainage holes. If you see a dense tangle of roots pressing against the sides, it's time.
- Roots growing out of drainage holes. When roots escape the pot, they've run out of room inside.
- Plant drying out within a day or two of watering. A root-bound plant has so much root mass and so little soil that the soil can't hold enough moisture.
- Stunted growth despite good care. If a plant has stopped growing in spring and summer despite adequate light and fertilizer, it may have run out of root space.
- Soil pulling away from the pot sides. Old, compacted soil shrinks and stops retaining water effectively.
- The plant is top-heavy and keeps falling over. A small pot can't anchor a large plant.
When not to repot
Timing matters. Avoid repotting in these situations:
- Winter. Most houseplants are dormant or near-dormant. Disturbing roots when the plant can't actively grow to recover is unnecessarily stressful.
- Right after bringing a new plant home. The plant is already adjusting to a new environment. Give it at least 4 to 6 weeks to acclimate before adding the stress of repotting.
- When the plant is flowering. Repotting can cause flower and bud drop. Wait until flowering is finished.
- When the plant is already stressed. A plant that's dealing with root rot, a pest infestation, or drought stress has enough to handle. Stabilize it first.
The best time to repot is early to mid spring, just as plants come out of dormancy and new growth begins. This gives them the whole growing season to settle into the new pot.
What pot size to choose
Go up one size. If the current pot is 4 inches in diameter, move to a 6-inch pot. If it's 6 inches, move to an 8-inch pot.
This is the most commonly violated rule in repotting. People see a large plant and buy a much larger pot, thinking the plant will appreciate the room. Instead, a pot that's too large holds far more soil than the roots can use. That excess soil stays wet, the roots can't reach it to pull moisture out, and root rot develops invisibly at the bottom of the pot.
One pot size up is the ceiling. One size up provides room to grow without creating a waterlogging problem.
The exception: if a plant has severe root rot and you're removing a significant portion of the root ball, you may actually need to go down a pot size so the reduced root system isn't overwhelmed by excess soil.
What you need
- A new pot, one size up, with drainage holes
- Fresh potting mix appropriate for the plant (standard indoor mix for most tropicals; cactus mix for succulents and cacti)
- A trowel or large spoon
- Something to protect the floor or table (newspaper, a tray)
- Clean scissors or pruning shears for trimming roots if needed
- Water
Step-by-step repotting
Step 1: Water the day before
Watering 24 hours before repotting does two things: it softens the root ball so it's easier to remove from the pot, and it reduces transplant shock by ensuring the plant is well-hydrated going in. Don't repot a bone-dry plant. The root ball will crumble and break apart.
Step 2: Prepare the new pot
Add a layer of fresh potting mix to the bottom of the new pot. How thick depends on the pot depth and the current root ball height. You want the top of the root ball to sit about an inch below the pot rim when placed in the new pot (to allow for watering without overflow). Test the depth, adjust, and set aside.
If you're reusing an old pot, wash it with soap and water first. Old pots carry pathogens and mineral buildup that can affect the new planting.
Step 3: Remove the plant from its current pot
Tip the pot sideways and gently slide the plant out. For stubborn plants, run a thin knife or chopstick around the inside edge of the pot to break the root seal. Squeeze plastic pots to help loosen the root ball. Never yank the plant out by the stem.
If the roots are tightly matted in a solid mass, that's a sign the plant was seriously root-bound. That's okay.
Step 4: Inspect and loosen the roots
Gently tease apart any circling or tightly matted roots with your fingers. Circling roots, if left intact, can eventually girdle the plant by constricting the trunk as both expand. Breaking them up encourages roots to grow outward into the new soil.
Look at the root color. Healthy roots are white, cream, or tan. Dead roots are brown and dry. Rotted roots are brown or black and mushy with an unpleasant smell. Trim away any rotted or completely dead roots with clean scissors. A little dead root trimming is fine; the plant will regrow them quickly in fresh soil.
Step 5: Place in the new pot
Set the plant in the center of the new pot, roots spread slightly outward. Check the height: the top of the root ball should sit about an inch below the pot rim. Add or remove soil from the base layer to adjust.
Don't plant deeper than the plant was sitting before. Burying the stem of most houseplants promotes rot. Keep the same depth.
Step 6: Fill with fresh potting mix
Fill in around the root ball with fresh potting mix, pressing it gently to eliminate large air pockets. Don't pack it so tightly that drainage is impeded. Leave about an inch of space at the top of the pot for watering.
Work the soil in around the roots rather than just piling it on top. You want good contact between the roots and the new soil.
Step 7: Water thoroughly
Water the plant until water runs freely from the drainage holes. This settles the soil, closes remaining air pockets, and gives the roots immediate access to moisture in the new medium.
After this initial watering, treat the plant as you normally would but check the soil more frequently for the first few weeks. Fresh potting mix tends to retain moisture well, so you may need to water less often than usual at first.
After repotting: what to expect
Some wilting or leaf drop in the first week is normal. The plant is recovering from root disturbance. Keep it out of direct sun for a few days to reduce stress. Don't fertilize for 4 to 6 weeks. Fresh potting mix contains nutrients; adding fertilizer on top can burn the recovering roots.
Most plants bounce back within 2 to 4 weeks and often show a burst of new growth shortly after as the roots settle into the fresh soil.
When to refresh soil instead of repotting
If a plant doesn't need a bigger pot but the soil is old and compacted, you can refresh the top few inches without a full repot. Scrape out the top 2 to 3 inches of old soil and replace with fresh potting mix. This replenishes nutrients and improves the soil structure at the surface where it matters most for water retention.
This is particularly useful for large floor plants like monsteras or fiddle leaf figs that would be very disruptive to fully repot.
After repotting, light matters more than ever. A plant in fresh soil in a bright window will establish far faster than one in a dim corner. Plant Compass Lite shows exactly which of your windows gets the most light.
Try Plant Compass Lite freePot material guide
Terracotta
Porous walls let soil breathe and dry faster. Great for succulents, cacti, and overwatering-prone plants. Heavy. Breaks if dropped. Ideal for drought-tolerant species.
Plastic
Lightweight, cheap, holds moisture longer. Good for moisture-loving plants like calatheas and ferns. Watch for overwatering since soil dries slowly. Most nursery pots are plastic.
Glazed ceramic
Non-porous. Holds moisture similarly to plastic. Heavier and more stable than plastic. Good for most tropical plants. Make sure it has drainage holes.
Wood
Breathable and insulating. Naturally rot-resistant woods like cedar or teak work well. Good for outdoor planters or large statement plants indoors.
Fabric grow bags
Highly breathable. Air-prune roots, preventing circling. Dry out quickly. Popular with aroids and fast-growing tropicals. Not decorative but functional.
Concrete or stone
Very heavy and stable. Slightly porous depending on finish. Excellent for large floor plants that need anchoring. Can affect soil pH slightly over time.
Frequently asked questions
How do I know when to repot a houseplant?
Repot when you see roots circling the inside of the pot, roots growing out of the drainage holes, the plant drying out within a day or two of watering, or stunted growth despite adequate light and care. Spring is the best time to repot, just as active growth begins.
What size pot should I repot into?
Go up one pot size — about 2 inches wider in diameter than the current pot. Going too large is a common mistake. A pot that's much bigger than the root ball holds excess moisture the roots can't use, which leads to root rot. One size up gives the roots room to spread without creating a waterlogging problem.
When is the best time to repot houseplants?
Spring is best, just as plants come out of winter dormancy and active growth begins. This gives the plant the whole growing season to establish in its new pot. Avoid repotting in winter when growth has slowed, immediately after bringing a new plant home, or when a plant is flowering.
How do I repot a plant without killing it?
Water the plant a day before repotting so the root ball holds together. Tip the plant out gently, loosen any circling roots with your fingers, remove dead or rotted roots, place in the new pot at the same depth as before, fill with fresh potting mix, and water in. Keep out of direct sun for a few days while it recovers.
Should I water after repotting?
Yes, water thoroughly after repotting to settle the soil and close air pockets around the roots. Then wait until the top inch or two of soil dries out before watering again. Fresh potting mix retains moisture well and overwatering after repotting is a common mistake. Don't fertilize for 4 to 6 weeks after repotting.