GrowSabzHow to grow basil in pots
Also called Sweet Basil, Genovese Basil, tulsi, rayhan · Ocimum basilicum
تلسی
- ☀️ Sunlight
- 6–8hours daily
- 💧 Water
- 0.4 Levery 2 days, 5 L pot
- 🌡️ Ideal temp
- 20–30°C
- 🪴 Min pot
- 5 L15 cm deep
- 🧺 Harvest
- 60–75days from sowing
- ⚖️ Yield
- 1 kgper 20 L pot
Basil is a heat-lover with no tolerance for cold. It wants 20–30 °C and frost kills it outright. Everything about growing it well comes down to timing — getting it into the season early enough to crop before temperatures fall away.
Short answer
Grow basil in a 5 litre container at least 15 cm deep, watering about 600 ml per 10 litres of soil every 2 days, and keep temperatures between 20 and 30 °C. First harvest comes 60–75 days after sowing.
Where to plant it
What size pot does basil need?
5 litres and 15 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 | 15 cm | Use pots with good drainage |
| Grow bag | 5 L | 15 cm | Fabric bags provide excellent aeration |
| Open ground | — | 20 cm | Ensure well-draining soil and adequate spacing |
| Raised bed | 10 L | 20 cm | Provides good drainage and soil control |
Watering
How often should you water basil?
Every 2 days through the growing season, at about 600 ml per 10 litres of soil — daily in hot weather, every 3 days when it turns cool. Water in the early morning. Bottom watering or at soil level works best.
Too little water
- wilting leaves
- leaf yellowing
- stunted growth
Too much water
- yellow lower leaves
- stunted growth
- root rot
- fungal issues
Avoid: overhead watering (can cause fungal issues); standing water; letting soil dry out completely.
Climate
Can you grow basil where you live?
No hardiness zone needed — compare your actual temperatures against the plant's own limits.
| Ideal range | 20 – 30 °C |
|---|---|
| Survives | 5 – 35 °C |
| Germinates above | 18 °C — best at 24 °C, about 7 days |
| Flowers drop | above 32 °C, or below 10 °C |
| Sunlight | 6–10 hrs/day, best 8 |
| Frost | Highly sensitive — will not survive it |
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 basil? Check your temperaturesEnter your night low and day high — see if it survives, and if it will cropTimeline
Basil 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 basil
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 basil 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. Basil wants about 600 ml per 10 litres of soil — one deep soak beats three shallow ones.
- Ignoring the flower-drop threshold
Above 32 °C, or below 10 °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 Rue
Rue is known to inhibit the growth of basil and other herbs, potentially stunting their development.
- Leaving it out through a cold snap
Basil is highly frost-sensitive. One night below 5 °C can end the plant outright — bring containers in or cover them.
Companions
What to plant with basil
Good neighbours
Basil is said to improve the flavor of tomatoes and repel pests like flies and mosquitoes. They also have similar growing needs.
Basil can deter common pepper pests and is believed to enhance the growth and flavor of pepper plants.
Both are herbs with similar growing conditions, and oregano can help deter pests from basil.
Chamomile is known as a 'nurse plant' and can improve the growth and flavor of nearby herbs, including basil.
Lettuce provides ground cover, helping to keep the soil cool and moist for basil, and can suppress weeds.
Keep apart from
Rue is known to inhibit the growth of basil and other herbs, potentially stunting their development.
Fennel is a notorious inhibitor of growth for many plants, including basil, releasing compounds that can stunt development.
While some herbs can be good companions, sage can sometimes stunt the growth of basil if planted too close.
Cucumbers and basil have different soil and moisture preferences, leading to competition and potential stress for basil.
Problems
Basil 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.
Fusarium Wilt humidity any · temp 20-30
Causes yellowing and wilting of leaves on one side of the plant, eventually leading to plant death. Often starts from the bottom leaves.
Downy Mildew humidity >85% · temp 15-25
Yellowing on the upper surface of leaves, with fuzzy gray-purple spores on the underside. Can quickly defoliate the plant.
Aphids humidity any · temp 15-25
Small, soft-bodied insects that cluster on new growth and the undersides of leaves, sucking sap and secreting sticky honeydew.
Spider Mites humidity <50% · temp >27
Tiny pests that cause leaves to look stippled, pale, and eventually turn yellow and drop. Fine webbing may be visible on the undersides.
Slugs Snails humidity >70% · temp 10-20
Irregular holes chewed in leaves, especially noticeable on young plants. Silvery slime trails are a clear sign.
Leaf Spot humidity >70% · temp 20-30
Small, dark, circular spots on leaves that may enlarge and merge. Can lead to defoliation in severe cases.
Root Rot humidity any · temp any
Yellowing, wilting, and stunted growth despite adequate watering. Roots appear dark and mushy. Caused by overwatering and poor drainage.
Bolting humidity any · temp >30
Premature flowering, often triggered by high temperatures or long daylight hours. Causes leaves to become bitter and reduces leaf production.
Harvest
When to harvest basil
First picking falls between day 60 and day 75, and the plant then keeps producing for about 120 days. Pick often — what you leave on the plant signals it to stop making more.
How to tell it's ready
- Leaves are large and fragrant
- Plant is at least 6-8 inches tall
How much to expect
Storing it: Fresh: stems in water at room temp; Dried: airtight container; Frozen: chopped in olive oil.
Questions
Basil: common questions
How long does basil take to grow?
About 60 days from sowing to the first harvest, with picking usually starting between day 60 and day 75. It then keeps producing for roughly 120 more days. Warm weather pulls that forward; cool weather pushes it back.
What size pot does basil need?
At least 5 litres and 15 cm deep for one plant. A raised bed wants 10 litres of soil and 20 cm of depth.
How often should I water basil?
About 600 ml per 10 litres of soil, every 2 days in normal weather — daily when it is hot and every 3 days when cool. Water in the early morning.
What temperature does basil need?
It does best between 20 °C and 30 °C and survives from 5 °C to 35 °C. Seed needs soil above 18 °C to germinate, ideally around 24 °C.
Can I grow basil in winter?
Not outdoors anywhere that frosts — it is highly frost-sensitive and will not survive it. In a frost-free winter it grows slowly; anywhere colder, treat it as a warm-season crop.
How do I know when basil is ready to harvest?
Leaves are large and fragrant; Plant is at least 6-8 inches tall. Once picked: fresh: stems in water at room temp; dried: airtight container; frozen: chopped in olive oil.
How much does one basil plant produce?
Roughly 1 kg from a 20 litre container, or about 2 kg in open ground. Larger containers give proportionally more, up to a point.