Rosemary is a gorgeous Mediterranean herb that grows very well in pots when you understand their preferred conditions.
However, if this is your first time growing them, then you need to know what they like and what to avoid.
If you mimic some of the growing conditions of the Rosemary’s Mediterranean environment, then growing rosemary in containers becomes predictable, reliable, and surprisingly easy.
This guide covers exactly how I now care for rosemary in pots, what works, what doesn’t, and the small changes that made the biggest difference long-term.
Why Rosemary Behaves Differently in Pots
Rosemary is native to dry, rocky regions around the Mediterranean (Think Southern France and Greece). In the ground, its roots spread wide through gritty soil, accessing oxygen easily and drying out quickly after rain.
The goal of caring for rosemary in pots is simple:
Make the container behave as much like Mediterranean ground as possible.
Choosing the Best Pot for Rosemary
This matters far more than most people realise.
I’ve grown rosemary in plastic pots, glazed ceramic, metal containers, and terracotta. Over time, one option consistently caused fewer problems.
Terracotta Pots: My Clear Favourite
Terracotta is porous, which means:
- Moisture evaporates through the sides
- Soil dries more evenly
- Roots get better airflow
When I switched most of my rosemary to terracotta pots, issues with soggy soil and root stress dropped dramatically, especially during cooler or wetter periods. So if you are in a climate that has much higher rainfall than the Mediterranean (which is most climates!), then terracotta or clay pot (also porous) are really important.
Plastic pots can work, but they hold moisture much longer as they are impermeable. If you use them, drainage and soil mix become even more critical.
Pot Size (Bigger Isn’t Always Better)
So, believe it or not, I think the size of the rosemary’s pot should depend on the climate (specifically temperature swings) and levels of rainfall. Rosemary needs to be in a pot that is proportionate to the size of the plant.
If the pot is too big, then it contains a greater amount of soil, which means it dries out more slowly. If the rosemary’s roots are in damp soil for too long, then they are likely to get root rot (due to its preference for drier soil).
If your rosemary is in a pot that is too small, then the soil can dry out incredibly quickly when in full sun.
The rosemary’s roots are the most temperature-sensitive part of the plant; when they are grown in the ground, the soil acts as insulation, keeping the roots protected from freezing temperatures. Therefore, if you are in a climate where it regularly drops below freezing in Winter then a small pot may not contain enough soil to keep the roots protected from cold.
With all this in mind, what is the optimum pot size? I always recommend a pot at least 12 inches across for rosemary and repot it every 2-3 years, just one size up at a time. This should strike a balance between enough soil for insulating the roots and not too much that the roots remain in damp soil.
One rule I never break: every rosemary pot must have drainage holes. No exceptions.
The Best Potting Soil for Rosemary (What Finally Worked)
This is the most critical step in caring for rosemary! Good drainage can mitigate problems with overwatering and excessive rainfall, and keeps the soil structure open so that the soil doesn’t bake hard in Summer heat.
Rosemary does not want rich, moisture-retentive soil. It wants soil that drains quickly, stays airy, and dries out fully between waterings.
My Early Mistake: Regular Potting Compost
Standard potting soil holds far too much moisture for rosemary, especially in containers. It stays damp around the roots long after the surface looks dry.
I also tried adding horticultural sand at one point. It helped slightly, but over time, I found it compacted after a year or so with watering and temperature fluctuations and didn’t maintain good airflow.
The Mix That Stopped Me Losing Rosemary
This is the mix I now use consistently:
- 70% peat-free compost
- 30% horticultural grit
I found grit far superior to sand. The larger particle size keeps air pockets open, prevents compaction, and improves drainage long-term, even after repeated watering or rain.
This mix closely mimics the rocky soils rosemary grows in naturally, and since switching to it, I’ve had far fewer issues with browning, drooping, or unexplained decline.
I can’t emphasise enough that if you are in a rainy climate and struggle with Mediterranean herbs, then gritty potting soil solves 90% of problems!
How to Water Rosemary in Pots (Less Than You Think)
This is where most people, including my past self, go wrong.
Rosemary hates being watered little and often. This can either only moisten the surface of the soil (rather than soak down and reach the roots) or keep the roots constantly damp, which leads to stress and disease.
The goal with watering is to ensure that the potting soil is evenly moist and wait until it dries before watering again.
This mimics the cycle of heavy rainfall, followed by a period of drought that they are accustomed to in the Mediterranean region of Europe.
How I Water Rosemary Now
- I water deeply, until water drains from the bottom
- Then I wait until the soil dries out completely
- I never water on a schedule, but rather respond to whether the soil is dry or not (which can vary according to climate, rainfall, temperature, etc.).
One habit that changed everything for me is the pot-weight test. I lift up the pots periodically to assess the weight.
- Heavy pot = soil still damp
- Light pot = time to water
In summer, this often means watering every 10–14 days. In cooler weather, it can be much less frequent. Rosemary will always tolerate being slightly dry better than being slightly wet. I don’t water rosemary in the Winter as wet and cold is a combination that rosemary does not like.
Sunlight Requirements (Indoors vs Outdoors)
Rosemary grows in Suny Southern Europe and needs full sun to thrive.
I aim for:
- At least 6–8 hours of direct sunlight per day
- More if possible
Outdoors
Outdoors is where rosemary is happiest. Full sun, good airflow, and natural drying cycles suit it perfectly. The more sunlight, the higher the concentration of essential oil in the leaves, which means better aroma and flavour!
Indoors
Rosemary can grow indoors, but it’s more challenging.
Indoors, I’ve found rosemary needs:
- The brightest window possible (south-facing if you’re in the Northern Hemisphere)
- Excellent airflow
- Very careful watering
Low light is one of the main reasons indoor rosemary declines. If it starts dropping leaves or turning brown, light is one of the first things I reassess. In Winter, indoors, a grow light may be necessary to supplement the natural light to ensure your rosemary survives the winter.
Should You Fertilise Rosemary?
In most cases: no.
Rosemary evolved in low-nutrient soils. Feeding it heavily, especially with nitrogen, often results in lots of leafy growth and fewer flowers.
I used to fertilise rosemary lightly in spring. The result was lush growth followed by decline.
Now:
- I don’t fertilise at all
- I prioritise soil, sun, and drainage instead
Leaner soil produces tougher, healthier plants long-term. Too much nitrogen makes the growth soft and sappy. The smell of the leaves is less intense, and the taste is weaker. With lower fertility in gritty soil, all essential oils responsible for the aroma and flavour are more concentrated, which means the smell is better and it’s better for cooking!
Pruning Rosemary in Pots (To Prevent Woody Growth)
Rosemary naturally becomes woody with age, but pruning helps slow this process and keeps plants compact.
What Works for Me
- Prune lightly and regularly rather than heavily
- Avoid cutting deep into old, woody stems
- Always leave green growth below cuts
I’ve found that gentle shaping throughout the growing season works better than one dramatic cut. If rosemary becomes very woody, it may not fully recover, which is why preventative pruning is so important.
Here is a YouTube video for a visual guide on pruning:
Seasonal Care for Potted Rosemary
Summer
- Water sparingly but deeply
- Watch for extreme heat stress (sometimes I move mypot to where it has morning sun and afternoon shade so that it benefits from the morning sun and doesn’t have to contend with the high temperatures of the afternoon.
- Ensure good airflow
Rosemary may droop slightly in intense heat but should recover overnight. Keep an eye on how quickly the soil is drying out by picking up the pot and assessing the weight and water generously when the pot feels light.
Winter
Winter is where most potted rosemary fails. Cold combined with wet soil is far more dangerous than cold alone.
What I do:
- I avoid watering in Winter as rosemary gets enough moisture from rainfall (unless it’s indoors, in which case only water when the soil feels dry)
- Raise pots off the ground (I do this with stones, bricks or little plant “feet” that are available at garden centres)
- Move containers to sheltered but sunny spots, as open ground tends to feel the frost more
- Never let pots sit in standing water
In wet climates, gritty soil and a porous type of pot (terracotta or clay) become even more important.
Quick Troubleshooting (And When to Dig Deeper)
If something looks off, here’s how I think about it:
- Rosemary turning brown: usually drainage or overwatering
- Drooping rosemary: root stress or wet soil
- Woody rosemary: age, pruning habits, or low light
- Yellowing: often water-related
If your rosemary is already turning brown, you’ll find a deeper, step-by-step diagnosis in my dedicated guide on that topic (it’s a great next read if you’re trying to save a struggling plant).
Common Mistakes I’ve Made (So You Don’t Have To)
Every one of these caused problems at some point:
- Using rich compost meant for bedding plants (avoid compost that has nutrients added to it)
- Watering “a little bit often”
- Growing rosemary in plastic pots with poor drainage
- Keeping it indoors without enough light
- Fertilising to “help it grow”
- Upsizing pots too quickly
Fixing these mistakes made rosemary one of the most reliable plants I grow.
Final Thoughts
Once I stopped treating rosemary like a thirsty herb and started treating it like a Mediterranean shrub, everything changed.
Gritty soil, full sun, excellent drainage, and restraint with water made rosemary in pots predictable instead of frustrating.
If you get the basics right, rosemary becomes resilient, productive, and long-lived, and most of the common problems simply stop appearing.