My plant is not growing: could it be nothing is wrong, and it is the resting season?

For a houseplant in the short days of winter, stalled growth is the expected state rather than a symptom. Published guidance calls it a resting stage, and the instruction that comes with it is to leave the plant alone rather than to feed it. Check the month and where the plant sits. Between about October and February, a foliage houseplant away from a bright window and under no plant light is doing exactly what extension guidance says it will do.

My plant is not growing: could it be the pot is full of roots, so there is nothing left to grow into?

The best documented answer for a plant in a container, and the one extension guidance names alongside stalled growth directly. Roots that reach the pot wall circle instead of spreading, and the restriction is treated as a physical stress on the plant rather than only a shortage of room. A plant still in the nursery pot it came home in is the likeliest case of all. Gently slide the plant out of the pot and look at the bottom third of the root ball. Roots circling the outside, or a mass so dense you cannot see potting mix down there, is the published signal. Roots coming out of the drainage holes and a pot that dries out unusually fast say it from the outside.

My plant is not growing: could it be it is too cold in the spot where the plant sits?

Growth is temperature driven, and this is the one cause on the list where published guidance says outright that temperature may stop growth. Indoors it is usually a spot problem rather than a house problem: a cold windowsill, a draft by a door, or a vent blowing on the plant. Feel the air where the plant actually sits rather than in the middle of the room, especially against the window on a cold night or near an outside door. A plant within reach of a heating or cooling vent is the other case worth catching.

My plant is not growing: could it be too much water, which takes the oxygen away from the roots?

A plant whose roots have been damaged cannot take up what it needs to build new growth, so it sits still. The published mechanism is about oxygen rather than about water itself. A pot with no drainage hole, or one standing in water in a saucer or a cachepot, is where this is likeliest, and watering daily is the habit that produces it. Push a finger two inches into the soil before you water again. If it is still damp down there, the plant is not using what it already has. Then slide it out and look at the roots: firm and pale is healthy, brown and soft is not.

My plant is not growing: could it be it was planted recently, and the first season goes underground?

For a plant that went in this year or last, very little top growth can be the establishment phase rather than a fault. Extension writers describe native and prairie plantings as sleeping the first year, creeping the second and leaping the third, and the reason is what is happening below the soil while nothing happens above it. Ask when it went in the ground. If it was planted this season or last, and the crown is firm and the stems are not shriveled, the honest answer is that it is too early to judge and the plant is doing what it should.

My plant is not growing: could it be fertilizer and tap water salts built up in the pot?

The visible one. In a container, fertilizer and the minerals in tap water collect where nothing carries them away, and published guidance says that buildup damages roots. A plant fed regularly in a pot is the case this belongs to. Look at the soil surface and the rim of the pot for a white or grey crust. It takes five seconds, and it is the only cause on this list you can rule in or out just by looking.

Plant problems

My plant is not growing

Name: Pollinator Patch
Author: Pollinator Patch

Short answer

Check the calendar before you change anything. A houseplant in the short days of winter is in what extension guidance calls a resting stage, and the published advice for a plant in it is not to feed it. Once that is ruled out, the best documented cause for anything in a pot is that the pot is full of roots, and the check is to slide the plant out and look at the bottom third of the root ball. After that, feel the air where the plant actually sits, because low temperature is the one thing published guidance says outright can stop growth, and look for a white crust on the soil or the pot rim, which is the only cause here you can settle by looking. A plant that went in the ground this year or last may simply be building roots first.

Most likely causes

Listed in the order they are worth ruling out. It is normal for more than one of these to be happening at once, so work down the list rather than stopping at the first match.

1
Nothing is wrong, and it is the resting season
For a houseplant in the short days of winter, stalled growth is the expected state rather than a symptom. Published guidance calls it a resting stage, and the instruction that comes with it is to leave the plant alone rather than to feed it.
What to check first
Check the month and where the plant sits. Between about October and February, a foliage houseplant away from a bright window and under no plant light is doing exactly what extension guidance says it will do.
2
The pot is full of roots, so there is nothing left to grow into
Roots circling the outside in a dense mat that holds the pot's shape after the pot is off, with very little soil still visible. This is what you see when you slide the plant out. Photo by Keith Williamson via Wikimedia Commons, CC BY
The best documented answer for a plant in a container, and the one extension guidance names alongside stalled growth directly. Roots that reach the pot wall circle instead of spreading, and the restriction is treated as a physical stress on the plant rather than only a shortage of room. A plant still in the nursery pot it came home in is the likeliest case of all.
What to check first
Gently slide the plant out of the pot and look at the bottom third of the root ball. Roots circling the outside, or a mass so dense you cannot see potting mix down there, is the published signal. Roots coming out of the drainage holes and a pot that dries out unusually fast say it from the outside.
3
It is too cold in the spot where the plant sits
Growth is temperature driven, and this is the one cause on the list where published guidance says outright that temperature may stop growth. Indoors it is usually a spot problem rather than a house problem: a cold windowsill, a draft by a door, or a vent blowing on the plant.
What to check first
Feel the air where the plant actually sits rather than in the middle of the room, especially against the window on a cold night or near an outside door. A plant within reach of a heating or cooling vent is the other case worth catching.
4
Too much water, which takes the oxygen away from the roots
A plant whose roots have been damaged cannot take up what it needs to build new growth, so it sits still. The published mechanism is about oxygen rather than about water itself. A pot with no drainage hole, or one standing in water in a saucer or a cachepot, is where this is likeliest, and watering daily is the habit that produces it.
What to check first
Push a finger two inches into the soil before you water again. If it is still damp down there, the plant is not using what it already has. Then slide it out and look at the roots: firm and pale is healthy, brown and soft is not.
5
It was planted recently, and the first season goes underground
For a plant that went in this year or last, very little top growth can be the establishment phase rather than a fault. Extension writers describe native and prairie plantings as sleeping the first year, creeping the second and leaping the third, and the reason is what is happening below the soil while nothing happens above it.
What to check first
Ask when it went in the ground. If it was planted this season or last, and the crown is firm and the stems are not shriveled, the honest answer is that it is too early to judge and the plant is doing what it should.
6
Fertilizer and tap water salts built up in the pot
The visible one. In a container, fertilizer and the minerals in tap water collect where nothing carries them away, and published guidance says that buildup damages roots. A plant fed regularly in a pot is the case this belongs to.
What to check first
Look at the soil surface and the rim of the pot for a white or grey crust. It takes five seconds, and it is the only cause on this list you can rule in or out just by looking.

Still not sure

This is exactly what your county Extension office answers, for free. They are the local horticulture experts for your area, they know what is going around this season where you live, and they will look at a photo.

Find your local Extension office