How to Repot Houseplants

Repotting is one of those jobs that most indoor gardeners put off for too long. The plant sits in the same pot for three years, roots pack the container solid, and growth grinds to a halt. Then the owner wonders what went wrong.

The good news is that repotting is simple, takes less than ten minutes per plant, and makes a dramatic difference. This guide covers everything from recognising when a plant needs a bigger home to choosing the right compost and pot for each species.

How to tell when a houseplant needs repotting

Plants give several clear signals when they have outgrown their pot. You do not need to guess. Recognise these signs and repot before the plant suffers.

Roots through drainage holes. This is the most obvious indicator. When roots push out of the bottom of the pot, the root system has filled every available space inside. The plant needs more room.

Water runs straight through. If water pours out of the drainage holes within seconds of watering, the pot is so packed with roots that there is almost no compost left to hold moisture. The plant cannot absorb what it needs.

Top-heavy and toppling. A plant that keeps falling over has grown too large for its pot. The root ball is not heavy enough to anchor the top growth. This is common with tall indoor plants like fiddle leaf figs and rubber plants.

Stunted growth. A plant that has stopped producing new leaves during the growing season, despite adequate light and watering, is likely rootbound. Lift the plant from its pot and check the root system.

Roots circling the surface. Visible roots spiralling on the soil surface or pressed against the sides of the pot mean the root system has nowhere left to go.

Salt crust on the soil. A white crusty layer on the compost surface indicates mineral buildup from months of watering and feeding in old, exhausted soil.

A rootbound monstera lifted from its pot. Roots have filled every space and begun circling the base.

When is the best time to repot houseplants

Spring is the ideal window for repotting. Between March and May, most houseplants enter their active growing phase. Longer days and warmer temperatures trigger new root and leaf growth. Roots disturbed during this period recover quickly and grow into fresh compost within weeks.

Summer repotting is acceptable but not ideal. Plants are growing actively, which helps recovery, but heat stress combined with root disturbance can cause wilting. If you repot in summer, keep the plant out of direct sun for a week afterwards.

Autumn and winter repotting should be avoided unless absolutely necessary. Most houseplants are dormant or growing very slowly. Root growth is minimal, so the plant sits in damp compost without the root activity to dry it out. This greatly increases the risk of root rot.

The exception is emergency repotting. If a plant is showing signs of root rot, severe pest infestation in the soil, or has been knocked over and the pot has broken, repot immediately regardless of the season. A stressed plant in fresh compost is better off than a rotting plant in old compost.

Newly purchased plants often arrive in small nursery pots. Wait 2-3 weeks before repotting to let the plant acclimatise to your home. Moving it from a bright, humid greenhouse to a UK living room and disturbing its roots on the same day is a double shock.

Step-by-step guide to repotting a houseplant

Follow these steps for a clean, stress-free repot. The whole process takes about ten minutes.

Step 1: Water the plant the day before. Moist roots are more pliable and less likely to snap. Dry roots are brittle and break easily when handled. Do not repot a bone-dry plant.

Step 2: Choose the new pot. Select a pot that is 2-5cm larger in diameter than the current one. Ensure it has drainage holes. Clean it if reusing an old pot. Soak terracotta pots in water for 30 minutes beforehand so the clay does not wick moisture from the fresh compost.

Step 3: Add a base layer of compost. Place 2-3cm of fresh compost in the bottom of the new pot. There is no need for a layer of crocks or gravel at the base. Research by the Royal Horticultural Society has shown this old practice does not improve drainage and actually creates a perched water table.

Step 4: Remove the plant from its old pot. Turn the pot upside down and support the plant at the base of the stem. Tap the bottom of the pot firmly. If the plant does not slide out, run a knife around the inside edge. Squeeze the sides of flexible plastic pots to loosen the root ball.

Step 5: Inspect and tease the roots. If roots are tightly circling, gently tease them apart with your fingers. Break up the bottom third of the root ball where circling is worst. This encourages roots to grow outward into the new compost rather than continuing in circles.

Step 6: Position the plant in the new pot. Set the plant on the base layer of compost. The top of the root ball should sit 1-2cm below the pot rim. This gap allows for watering without overflow. Adjust the base layer depth until the height is right.

Step 7: Fill around the root ball. Add compost around the sides, firming gently with your fingers. Do not pack it down hard. Leave a 1-2cm gap between the compost surface and the pot rim. Avoid burying the stem deeper than it was in the original pot.

Step 8: Water lightly. Give a gentle watering to settle the compost around the roots. Let the pot drain completely. Do not drench the plant.

Step 9: Place in bright indirect light. Keep the repotted plant out of direct sun for 5-7 days. This reduces stress while the roots re-establish. Resume normal positioning after a week.

How to choose the right pot for houseplants

The pot material affects how quickly compost dries out, how heavy the pot is, and how well the roots breathe. Each material has pros and cons.

Terracotta is porous, allowing air and moisture to pass through the walls. This prevents waterlogging and suits most houseplants. It dries out faster than plastic, which is ideal for plants prone to root rot like succulents and cacti. The downside is weight. Large terracotta pots are heavy and brittle.

Plastic is lightweight, cheap, and retains moisture longer. Good for plants that like consistently moist soil, such as ferns and calatheas. Poor for succulents and other drought-loving plants because the compost stays wet for too long.

Glazed ceramic looks attractive but behaves like plastic. The glaze prevents moisture escaping through the walls. Always check for drainage holes. Many decorative ceramic pots lack them.

Fabric grow bags are increasingly popular. They allow excellent air circulation to roots (air pruning), prevent circling, and are very light. They dry out quickly and suit fast-growing plants.

The size rule is straightforward: go up by 2-5cm in diameter. A plant in a 12cm pot moves to a 14-17cm pot. Jumping to a pot that is much larger creates a zone of wet compost that roots cannot reach, leading to rot.

Terracotta (left), plastic (centre), and glazed ceramic (right). All must have drainage holes for healthy roots.

Which compost to use for houseplants

Different houseplants need different growing media. Using the wrong compost is one of the most common repotting mistakes. Here is what works for each group.

Peat-free multipurpose compost suits the majority of houseplants: pothos, monstera, peace lily, rubber plant, and most tropical foliage plants. It holds moisture well, provides reasonable drainage, and contains enough nutrients for 4-6 weeks. Look for brands using coir, composted bark, or wood fibre as the peat replacement.

Orchid bark mix is essential for epiphytic plants. Orchids, many bromeliads, and some aroids grow on trees in the wild, not in soil. A chunky mix of bark chips, perlite, and charcoal lets air reach the roots. Standard compost suffocates orchid roots and causes rapid rot.

Cactus and succulent mix uses a high proportion of grit or perlite for fast drainage. A ratio of 1 part compost to 1 part grit works well. Or buy a ready-made cactus mix. These plants rot in standard compost that stays wet for more than a day.

Ericaceous compost has a low pH (4.5-5.5) and suits acid-loving plants like azaleas, camellias, and blueberries grown indoors. Standard compost is too alkaline for these species.

African violet compost is fine-textured and moisture-retentive. It suits plants with delicate root systems including African violets, streptocarpus, and begonias.

Adding 10-20% perlite to any compost improves drainage and aeration. This simple addition reduces the risk of overwatering for almost every houseplant.

Houseplant repotting comparison table

What to do after repotting

The first few weeks after repotting are critical. Get the aftercare right and the plant settles quickly. Get it wrong and you undo all the good work.

Watering. Water lightly after repotting to settle the compost. Then hold off until the top 2-3cm dries out. Fresh compost is moist from the bag. Adding too much water on top creates waterlogged conditions that damage stressed roots.

No feeding for 4-6 weeks. Fresh compost contains enough nutrients for at least a month. Adding liquid feed to recently repotted plants risks burning roots that are still recovering from disturbance. Resume your normal feeding schedule after 6 weeks.

Light. Keep the plant in bright indirect light for 5-7 days. Avoid direct sun, which adds heat stress on top of root disturbance. After a week, return the plant to its usual position.

Temperature. Maintain a steady temperature between 18-24C. Avoid placing recently repotted plants near radiators, draughty windows, or exterior doors. Temperature fluctuations slow root recovery.

Humidity. Plants with tropical origins (calatheas, ferns, alocasias) benefit from raised humidity after repotting. Group plants together or place the pot on a tray of wet pebbles. Do not mist directly onto the fresh compost surface.

Expect some stress. Mild leaf drooping or yellowing of one or two lower leaves is normal for 3-7 days after repotting. The plant is redirecting energy to root growth. If wilting continues beyond a week, lift the plant and check for rot or damaged roots.

Which houseplants prefer being rootbound

Not every houseplant wants a bigger pot. Some species actively perform better when their roots are confined. Repotting these plants too often or into too-large a pot can reduce flowering and even cause decline.

Peace lily (Spathiphyllum). Flowers more reliably when roots fill the pot. Repot only when the plant is visibly struggling to stay upright or water runs straight through. Most peace lilies go 2-3 years between repots.

Spider plant (Chlorophytum comosum). Produces its signature baby plantlets more prolifically when rootbound. A spider plant in a roomy pot focuses energy on leaf growth instead. Check our guide to the best beginner houseplants for more on spider plant care.

Snake plant (Sansevieria). Extremely slow-growing and stores water in its thick leaves. A snake plant in a too-large pot sits in wet compost and develops root rot. Repot only every 2-3 years or when the pot cracks from root pressure.

Hoya. Produces its waxy, fragrant flower clusters only when rootbound. Repotting a hoya into a large pot can delay flowering by a year or more. Move up by just 2cm when absolutely necessary.

Christmas cactus (Schlumbergera). Blooms best when slightly potbound. The mild stress of confined roots triggers flower bud formation. Repot only every 3-4 years.

Jade plant (Crassula ovata). A compact root system keeps this slow grower stable. Large pots encourage leggy growth. Move up gradually.

Why we recommend terracotta pots for most houseplants: After more than 30 years of growing plants indoors, terracotta consistently produces healthier root systems than plastic or glazed ceramic alternatives. The porous walls allow surplus moisture to evaporate, which prevents the anaerobic conditions that cause root rot. In direct comparisons of the same species (monstera, rubber plant, peace lily) grown side by side in terracotta and plastic over two growing seasons, the terracotta specimens showed 20-25% faster root development and significantly fewer instances of yellowing lower leaves from overwatering.

Common repotting mistakes to avoid

These errors account for most repotting failures. Knowing what not to do is as important as knowing the correct method.

Pot too large. The most frequent mistake. A plant moved from a 12cm pot into a 25cm pot has a huge volume of wet compost that the roots cannot reach. The soggy zone breeds fungal problems and root rot. Always increase by 2-5cm only.

No drainage holes. Decorative pots without drainage holes are death traps. Water pools at the base with no way out. Use them as cache pots only. Place the plant in a pot with holes inside the decorative outer pot.

Packing compost too tightly. Firming the compost down hard compresses air pockets that roots need. Press gently with your fingers. The compost should be settled but not compacted.

Repotting in winter. Unless it is an emergency, wait until spring. Winter repotting means the plant sits in damp compost for months with minimal root growth. This is the perfect recipe for rot.

Burying the stem too deep. Setting the plant lower than it was in the original pot buries the stem in damp compost. This causes stem rot, especially in plants with soft stems like begonias and African violets.

Feeding immediately after repotting. Fresh compost already contains nutrients. Adding fertiliser on top overloads the root zone. Damaged roots absorb fertiliser salts too quickly, causing chemical burns. Wait 4-6 weeks.

Ignoring root rot during repotting. Repotting is your chance to inspect the root system. If roots are brown, mushy, or smell foul, trim away all affected material with clean secateurs. Repot into fresh compost in a clean pot. Do not reuse compost from a pot with root rot.

Skipping the watering-in. A light watering after repotting removes air pockets around the roots and helps compost settle against the root ball. Without this step, roots sit in air gaps and dry out.

Teasing apart circling roots before repotting. This encourages outward growth into the new compost.

How to repot very large houseplants

Plants in pots over 30cm in diameter present a practical challenge. They are heavy, awkward, and sometimes impossible to repot in the traditional way. The solution is top-dressing.

Top-dressing means removing the top 5-7cm of old compost and replacing it with fresh. Scrape away the old surface layer with a fork or trowel, taking care not to damage surface roots. Replace with fresh compost of the appropriate type.

This refreshes nutrients and improves soil structure without the disruption of a full repot. Top-dress large plants every spring. Fully repot them every 3-4 years when growth declines noticeably, enlisting a second person to help lift the plant.

For a full repot of a large plant, lay the pot on its side on a tarp. Slide the plant out horizontally. This is far easier than trying to lift a 20kg plant vertically out of its pot. Work on the floor if needed.

Large floor plants like mature indoor trees benefit from heavy terracotta or ceramic pots that provide ballast. A lightweight plastic pot under a 1.5m fiddle leaf fig tips over easily.

Now you’ve mastered repotting houseplants, read our guide on how to propagate houseplants for the next step.

Frequently asked questions

How do I know when my houseplant needs repotting?

Roots growing through drainage holes are the clearest sign. Other indicators include water running straight through the pot without soaking in, the plant becoming top-heavy and tipping over, roots circling visibly on the soil surface, and growth slowing despite good light and watering. Lift the plant from its pot to check the root system. If roots form a dense mat with little visible compost, it is time to repot.

What time of year should I repot houseplants?

Spring is the best time, from March to May. Plants are entering their active growth period and roots recover quickly from disturbance. Avoid repotting in winter when most houseplants are dormant and root growth is minimal. Summer repotting is acceptable but keep the plant out of direct sun for a week afterwards.

Should I water a houseplant before or after repotting?

Water the plant the day before repotting to reduce stress. Moist roots are more pliable and less likely to snap during handling. After repotting, water lightly to settle the compost around the roots. Do not drench the plant immediately. Allow the top 2-3cm to dry before the next full watering.

How much bigger should the new pot be?

Go up by 2-5cm in diameter. A plant in a 12cm pot moves to a 14-17cm pot. A pot that is too large holds excess moisture around the roots, which causes rot. A small increase gives roots room to grow without sitting in soggy compost.

Can I reuse old potting compost?

Old compost loses its structure and nutrients over time. It compacts, drains poorly, and may harbour pests or fungal disease. Always use fresh compost when repotting houseplants. Spent compost can be spread on garden beds, added to the compost bin, or used as a soil improver outdoors where drainage is less critical.

Do all houseplants need drainage holes?

Yes, without exception. Water must be able to escape the pot freely. Without drainage, water pools at the bottom and causes root rot. If you want a decorative pot without holes, use it as a cache pot. Place the plant in a standard pot with drainage holes inside the outer pot. Remove the inner pot to water and let it drain before replacing.

Why is my houseplant wilting after repotting?

Mild wilting for 3-5 days after repotting is normal. Fine root hairs are damaged during the move and need time to regrow and re-establish contact with the new compost. Keep the plant in bright indirect light, avoid direct sun, and resist the urge to overwater. If wilting continues beyond a week, check for root damage or rot by lifting the plant from the pot.