GrowSabzHow to grow rosemary in pots
Also called Dew of the Sea, Old Man, rosmarinus, iklil al-jabal · Salvia rosmarinus
روزمیری
- ☀️ Sunlight
- 6–8hours daily
- 💧 Water
- 0.8 Levery 7 days, 10 L pot
- 🌡️ Ideal temp
- 18–27°C
- 🪴 Min pot
- 10 L25 cm deep
- 🧺 Harvest
- 90–120days from sowing
- ⚖️ Yield
- 0.2 kgper 20 L pot
Rosemary is a long game. From seed it takes 90-120 days (light harvest), 1-2 years (established) before you see a harvest, which is why most growers start from a nursery plant. Container growing is entirely possible, but the container has to be sized for a plant that will live in it for years.
Short answer
Grow rosemary in a 10 litre container at least 25 cm deep, watering about 500 ml per 10 litres of soil every 7 days, and keep temperatures between 18 and 27 °C. First harvest comes 90–120 days after sowing.
Where to plant it
What size pot does rosemary need?
10 litres and 25 cm deep is the realistic minimum for a single plant. Pick a container below to see what changes.
| Container | Minimum size | Depth | Notes |
|---|---|---|---|
| Pot | 10 L | 25 cm | Ensure excellent drainage. Terracotta pots are ideal. |
| Grow bag | 10 L | 25 cm | Fabric bags provide good aeration and drainage. |
| Open ground | — | 30 cm | Plant in well-draining soil, avoid heavy clay. Space plants adequately. |
| Raised bed | 20 L | 30 cm | Allows for custom soil mix with excellent drainage. |
Watering
How often should you water rosemary?
Every 7 days through the growing season, at about 500 ml per 10 litres of soil — every 3 days in hot weather, every 14 days when it turns cool. Water in the early morning. Deep watering at the base, allowing soil to dry works best.
Too little water
- drooping needles
- browning tips
- stunted growth
Too much water
- yellowing needles
- wilting despite wet soil
- soft stems
- root rot
Avoid: overhead watering; soggy soil; standing water; frequent shallow watering.
Climate
Can you grow rosemary where you live?
No hardiness zone needed — compare your actual temperatures against the plant's own limits.
| Ideal range | 18 – 27 °C |
|---|---|
| Survives | -7 – 38 °C |
| Germinates above | 18 °C — best at 24 °C, about 21 days |
| Flowers drop | above 35 °C, or below -5 °C |
| Sunlight | 6–12 hrs/day, best 8 |
| Frost | Medium sensitivity |
The flower-drop thresholds matter more than the survival ones. A plant can be perfectly alive at 38 °C and still give you nothing.
How cold is too cold for rosemary? Check your temperaturesEnter your night low and day high — see if it survives, and if it will cropTimeline
Rosemary 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 rosemary
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 rosemary fails, and how to avoid it
- A container that is too small
Below 10 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. Rosemary wants about 500 ml per 10 litres of soil — one deep soak beats three shallow ones.
- Ignoring the flower-drop threshold
Above 35 °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.
- Planting it beside Cucumber
Rosemary can stunt the growth of cucumbers due to differing soil and water needs.
Companions
What to plant with rosemary
Good neighbours
Rosemary's strong scent deters cabbage moths and other brassica pests.
Helps deter the carrot rust fly, protecting carrot roots.
Rosemary can deter bean beetles and other common bean pests.
They have similar growing requirements and do not compete, making them good neighbors.
Attracts beneficial pollinators and shares similar preferences for sun and well-drained soil.
Keep apart from
Rosemary can stunt the growth of cucumbers due to differing soil and water needs.
Similar to cucumbers, rosemary can inhibit the growth of pumpkins and other squash varieties.
Mint is highly invasive and will aggressively compete with rosemary for resources, often overpowering it.
Basil prefers more moisture and richer soil than rosemary, leading to competition and poor growth for one or both.
Problems
Rosemary 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.
Root Rot humidity >70% · temp any
Caused by overwatering and poor drainage. Leaves yellow, wilt, and plant eventually dies. Ensure soil dries out between waterings.
Powdery Mildew humidity 50-70% · temp 20-27
White, powdery spots on leaves and stems, especially in humid conditions with poor air circulation. Improve ventilation and avoid overhead watering.
Aphids humidity any · temp 15-25
Small insects clustering on new growth, sucking sap. Can cause distorted leaves. Rosemary's strong scent usually deters them, but outbreaks can occur.
Spider Mites humidity <50% · temp >27
Tiny pests causing stippling on leaves and fine webbing. Common in hot, dry conditions. Mist plants regularly to deter.
Scale Insects humidity any · temp any
Small, immobile bumps on stems and undersides of leaves. They suck sap and excrete honeydew, weakening the plant over time.
Botrytis Blight humidity >80% · temp 18-24
Fuzzy gray mold on leaves, stems, and flowers, especially in dense, humid conditions. Remove affected parts and improve air circulation.
Harvest
When to harvest rosemary
First picking falls between day 90 and day 120.
How to tell it's ready
- Stems are firm and woody at the base, leaves are fragrant and vibrant green.
How much to expect
Storing it: Fresh: in a glass of water on the counter or wrapped in a damp paper towel in the fridge. Dried: hung in bundles in a cool, dark place. Frozen: chopped and stored in ice cube trays with olive oil.
Questions
Rosemary: common questions
How long does rosemary take to grow?
About 120 days from sowing to the first harvest, with picking usually starting between day 90 and day 120. Warm weather pulls that forward; cool weather pushes it back.
What size pot does rosemary need?
At least 10 litres and 25 cm deep for one plant. A raised bed wants 20 litres of soil and 30 cm of depth.
How often should I water rosemary?
About 500 ml per 10 litres of soil, every 7 days in normal weather — every 3 days when it is hot and every 14 days when cool. Water in the early morning.
What temperature does rosemary need?
It does best between 18 °C and 27 °C and survives from -7 °C to 38 °C. Seed needs soil above 18 °C to germinate, ideally around 24 °C.
Can I grow rosemary in winter?
It tolerates cold better than most, down to about -7 °C, so a sheltered spot or a cold frame will often carry it through.
How do I know when rosemary is ready to harvest?
Stems are firm and woody at the base, leaves are fragrant and vibrant green.. Once picked: fresh: in a glass of water on the counter or wrapped in a damp paper towel in the fridge. dried: hung in bundles in a cool, dark place. frozen: chopped and stored in ice cube trays with olive oil.
How much does one rosemary plant produce?
Roughly 0.2 kg from a 20 litre container, or about 0.5 kg in open ground. Larger containers give proportionally more, up to a point.