GrowSabzHow to grow catnip in pots
Also called Catmint, Catwort, Field Balm, catmint · Nepeta cataria
کیٹ نِپ
- ☀️ Sunlight
- 6–8hours daily
- 💧 Water
- 0.3 Levery 3 days, 5 L pot
- 🌡️ Ideal temp
- 18–29°C
- 🪴 Min pot
- 5 L20 cm deep
- 🧺 Harvest
- 60–90days from sowing
- ⚖️ Yield
- 0.4 kgper 20 L pot
Catnip keeps producing once it starts. First picking comes around day 60, and the plant then crops for roughly 180 more days — but only if you keep picking. Letting it run to flower is what ends the supply.
Short answer
Grow catnip in a 5 litre container at least 20 cm deep, watering about 500 ml per 10 litres of soil every 3 days, and keep temperatures between 18 and 29 °C. First harvest comes 60–90 days after sowing.
Where to plant it
What size pot does catnip need?
5 litres and 20 cm deep is the realistic minimum for a single plant. Pick a container below to see what changes.
| Container | Minimum size | Depth | Notes |
|---|---|---|---|
| Pot | 5 L | 20 cm | Ensure good drainage. Catnip can spread, so a larger pot might be needed for mature plants. |
| Grow bag | 7 L | 20 cm | Fabric bags provide excellent aeration and drainage, preventing root rot. |
| Open ground | — | 25 cm | Catnip can be invasive in ideal conditions; consider planting in a contained area or regularly pruning. |
| Raised bed | 15 L | 25 cm | Raised beds offer good drainage and control over soil composition, ideal for catnip. |
Watering
How often should you water catnip?
Every 3 days through the growing season, at about 500 ml per 10 litres of soil — every 2 days in hot weather, every 5 days when it turns cool. Water in the early morning. Base watering works best.
Too little water
- wilting leaves
- slow growth
- leaf edges browning
Too much water
- yellowing leaves
- stunted growth
- root rot
Avoid: standing water; soggy soil.
Climate
Can you grow catnip where you live?
No hardiness zone needed — compare your actual temperatures against the plant's own limits.
| Ideal range | 18 – 29 °C |
|---|---|
| Survives | -10 – 35 °C |
| Germinates above | 18 °C — best at 21 °C, about 10 days |
| Flowers drop | above 32 °C, or below 5 °C |
| Sunlight | 6–14 hrs/day, best 8 |
| Frost | Low sensitivity |
The flower-drop thresholds matter more than the survival ones. A plant can be perfectly alive at 35 °C and still give you nothing.
How cold is too cold for catnip? Check your temperaturesEnter your night low and day high — see if it survives, and if it will cropTimeline
Catnip growing stages, day by day
Click any stage to see what's happening. Durations shift with temperature — a warm season runs roughly a quarter faster than a cool one.
Feeding
Fertiliser schedule for catnip
Feed on the interval below, changing what you give as the plant shifts from making leaves to making fruit.
| Stage | What to use | Per 10 L | Every |
|---|
How to prepare each feed
Common mistakes
Why catnip fails, and how to avoid it
- A container that is too small
Below 5 litres the root run is too shallow. The plant grows, flowers late, and drops whatever it sets because it cannot support the crop.
- Watering too lightly
A daily splash wets the top few centimetres and nothing else. Catnip wants about 500 ml per 10 litres of soil — one deep soak beats three shallow ones.
- Ignoring the flower-drop threshold
Above 32 °C, or below 5 °C, flowers fall before setting. The plant can look perfectly healthy and still give you nothing — shade it through the hottest hours.
- Harvesting too late
Left too long the colour changes, seeds harden and the flavour sharpens. Pick on the signs listed below, not on the calendar.
- Planting it beside Rue
Rue is known to inhibit the growth of many plants, including catnip, and can stunt its development.
Companions
What to plant with catnip
Good neighbours
Deters flea beetles, aphids, and other common garden pests from tomatoes and other vegetables.
Helps to deter potato beetles, a common pest for potato plants.
Repels flea beetles and other brassica pests, protecting cabbage, broccoli, and kale.
Its strong scent can deter a wide range of pests, complementing catnip's own pest-repelling properties.
Can deter aphids and Japanese beetles from roses, improving their health and bloom.
Keep apart from
Rue is known to inhibit the growth of many plants, including catnip, and can stunt its development.
Fennel produces substances from its roots that can inhibit the growth of many nearby plants, including catnip.
While not directly harmful, catnip can outcompete basil for resources due to its vigorous growth habit, potentially stunting basil.
Problems
Catnip pests and diseases
Each lists the weather that brings it on, so you know when to start checking rather than reacting once it's established.
Powdery Mildew humidity >70% · temp 18-28
White, powdery spots on leaves, especially in humid conditions with poor air circulation. Can weaken the plant if severe.
Aphids humidity any · temp 15-25
Small, soft-bodied insects that cluster on new growth and undersides of leaves, sucking sap. Can cause distorted growth.
Spider Mites humidity <50% · temp >27
Tiny pests causing stippling on leaves, leading to yellowing and eventual leaf drop. Fine webbing may be visible on severe infestations.
Root Rot humidity any · temp any
Caused by overwatering and poorly draining soil. Symptoms include wilting, yellowing leaves, and a soft, mushy stem base.
Leaf Spot humidity >75% · temp 20-30
Small, dark, circular spots on leaves that may merge and cause defoliation. Often fungal, exacerbated by wet foliage.
Harvest
When to harvest catnip
First picking falls between day 60 and day 90, and the plant then keeps producing for about 180 days. Pick often — what you leave on the plant signals it to stop making more.
How to tell it's ready
- Plant is at least 6-8 inches tall and well-established
- Before flowering for highest potency (leaves are most aromatic)
- Leaves are lush and green
How much to expect
Storing it: Fresh: Refrigerate in a plastic bag for up to a week. Dried: Hang bundles in a cool, dark, well-ventilated area until crisp, then store in airtight containers.
Questions
Catnip: common questions
How long does catnip take to grow?
About 70 days from sowing to the first harvest, with picking usually starting between day 60 and day 90. It then keeps producing for roughly 180 more days. Warm weather pulls that forward; cool weather pushes it back.
What size pot does catnip need?
At least 5 litres and 20 cm deep for one plant. A raised bed wants 15 litres of soil and 25 cm of depth.
How often should I water catnip?
About 500 ml per 10 litres of soil, every 3 days in normal weather — every 2 days when it is hot and every 5 days when cool. Water in the early morning.
What temperature does catnip need?
It does best between 18 °C and 29 °C and survives from -10 °C to 35 °C. Seed needs soil above 18 °C to germinate, ideally around 21 °C.
Can I grow catnip in winter?
It tolerates cold better than most, down to about -10 °C, so a sheltered spot or a cold frame will often carry it through.
How do I know when catnip is ready to harvest?
Plant is at least 6-8 inches tall and well-established; Before flowering for highest potency (leaves are most aromatic); Leaves are lush and green. Once picked: fresh: refrigerate in a plastic bag for up to a week. dried: hang bundles in a cool, dark, well-ventilated area until crisp, then store in airtight containers.
How much does one catnip plant produce?
Roughly 0.4 kg from a 20 litre container, or about 1 kg in open ground. Larger containers give proportionally more, up to a point.