Does My Plant Need Repotting?
Not every struggling houseplant needs a bigger pot. Use this visual checker to work out whether your plant is happy where it is, needs fresh soil, or genuinely needs more root space.
First: check the root ball
The root ball is simply the mass of roots and soil that comes out of the pot with your plant.
Gently slide the plant from its pot and look at the outside. There is usually no need to remove all the soil or pull the roots apart.
The root ball is the mass of roots and soil that holds together when a plant is removed from its pot.
Healthy root ball
Seeing roots does not automatically mean your plant is root-bound.
If plenty of soil is still visible and the roots are not densely wrapping around the outside, your plant may be perfectly happy where it is.
Plenty of soil is still visible and the roots are not tightly circling the outside.
Slightly root-bound
Some roots beginning to circle the outside of the root ball is common in established houseplants.
If plenty of soil is still visible and the roots are not tightly packed, repotting may not be urgent.
Some roots are starting to circle, but there is still plenty of soil left.
Very root-bound
A plant is much more likely to need more space when roots form a dense mass around the sides and bottom of the root ball and very little soil remains visible.
Move up gradually rather than jumping into a much larger pot.
Dense circling roots with very little soil visible are a strong sign that repotting may be due.
Roots coming out of the bottom?
This can be a sign that a plant needs repotting — but not always.
A few roots may simply have found their way through the drainage holes while the rest of the root ball still has plenty of room.
A few roots through the drainage holes do not automatically mean the plant needs a bigger pot.
Check the root ball too. Roots coming through the bottom become more meaningful when there are lots of them, the root ball is densely packed, very little soil remains, or the pot dries much faster than it used to.
Bigger pot — or just fresh soil?
Repotting does not always mean using a larger pot.
Potting mix gradually breaks down and may become compacted, difficult to re-wet or slow to drain.
If the roots still have enough room but the soil needs replacing, the plant can often go straight back into the same size pot with fresh, suitable soil.
Compacted old soil may need replacing even when the plant does not need a larger pot.
Soil staying wet and the plant struggling?
If the soil is already staying wet for too long, don't automatically move into a bigger pot. More unused soil around the roots can make the problem worse.
Same pot or size up?
Use the same size pot when:
- The roots still have room
- The soil needs replacing
- The existing mix is unsuitable or compacted
- The plant has previously been over-potted
- Damaged or rotten roots have substantially reduced the root system
Move up one pot size when:
- Roots densely fill the current pot
- Very little soil remains
- Roots are heavily circling the root ball
- The plant genuinely needs more root space
Fresh soil can be enough when roots still have room; crowded roots usually need the next pot size up.
How much bigger should the new pot be?
For most houseplants, a new pot around 2–5 cm wider than the current pot is enough. Smaller plants should generally stay towards the lower end of that range.
Avoid jumping several pot sizes at once. A large volume of unused soil can remain wet for much longer than a smaller root system can use it.
For most houseplants, choose a new pot only slightly wider than the current one.
Already chosen your new pot?
Don't guess how many litres of soil you'll need. Measure your pot — or use the quick estimate option if you don't have a measuring tape.
A few repotting mistakes to avoid
- Don't repot just because you can see one root.
- Don't automatically size up because soil is staying wet.
- Don't jump several pot sizes at once.
- Don't aggressively pull apart healthy roots.
- Don't bury the plant much deeper than it was growing before.
- Don't assume brown roots are rotten — healthy root colour varies.
- Investigate roots that are soft, mushy, collapsing or foul-smelling.
- Use a pot with drainage holes, or a draining nursery pot inside a decorative cover pot.
- Remember that ZZ plants and snake plants can be happy fairly snug.
- Judge the whole plant rather than relying on one sign.
What should healthy roots look like?
Healthy roots vary between plants. They may be white, cream, tan or brown, so colour alone isn't enough to diagnose root rot.
The more useful clue is texture: healthy roots should generally feel firm, while rotten roots are more likely to feel soft, mushy or collapse when handled.
Found soft, mushy or foul-smelling roots?
Don't simply move the plant into a bigger pot. Check for root rot first.
When should I repot?
Spring and early summer are convenient times for most actively growing houseplants, but there is no need to wait for the perfect season if there is an urgent problem.
Root rot, badly compacted soil, serious drainage problems, a broken pot or severe root-binding can justify repotting sooner.
Just bought the plant?
A new plant does not automatically need repotting.
If it looks healthy, the soil behaves normally and the roots still have room, allowing it to settle first can avoid unnecessary disturbance.
Does your plant actually need repotting?
Tick everything that genuinely applies. The checker separates signs of crowded roots from signs that may point to soil or root problems instead.
Signs it may need more root space
Signs it may need fresh soil or investigation instead
Choosing the right soil matters too
Fresh soil should suit the plant's moisture and aeration needs rather than simply filling the pot.
After repotting
Return the plant to suitable light and give it stable conditions while it settles.
- Check the soil before watering rather than automatically following the old routine.
- A different pot or fresh mix may dry at a different rate.
- Mild temporary drooping can happen after repotting.
- Avoid repeatedly disturbing the plant.
- Avoid unnecessary fertiliser immediately afterwards, particularly if the new mix already contains nutrients.
Cacti, succulents and plants with damaged roots can need different aftercare, so follow guidance for the particular plant.
Choose the right pot, use a suitable mix and work out how much soil you need before you start.
Repotting FAQs
Do roots coming out of the bottom always mean I need to repot?
No. A few roots through drainage holes may simply have found the easiest route out. Check the whole root ball and other signs before sizing up.
Can I repot into the same size pot?
Yes. If the roots still have room but the soil has broken down or compacted, fresh soil in the same size pot may be enough.
How much bigger should the new pot be?
For most houseplants, around 2–5 cm wider than the current pot is enough.
What if the soil stays wet for a long time?
Don't automatically choose a larger pot. Check the soil, drainage and roots first, because a larger volume of wet soil can make the problem worse.
What if I find soft or mushy roots?
Investigate for root rot before simply sizing up. The new pot should suit the remaining healthy root system.
Ready when your plant is
Check the roots. Choose the right pot. Then work out how much soil you need.