Basil microgreens are aromatic, tender and packed with the distinctive fresh flavour of mature basil. They take a little longer to grow than fast microgreens such as radish, broccoli and mustard, but their strong culinary flavour makes them an excellent choice for salads, pasta, tomato dishes and garnishes.
If you are learning how to grow basil microgreens, the most important thing to understand is that basil behaves differently from many other microgreen seeds. Basil seed becomes surrounded by a clear, jelly-like coating when wet. This is completely normal and means the seed should generally not be pre-soaked before sowing.
With suitable warmth, even moisture and good light after germination, basil microgreens are commonly ready to harvest in approximately 20–25 days.
Shop Basil Microgreen Seeds from Seedmart Australia, available in packet and bulk quantities.
Basil Microgreens at a Glance
| Growing Factor | Recommendation |
|---|---|
| Botanical name | Ocimum basilicum |
| Days to harvest | Approximately 20–25 days |
| Seed soaking | Not recommended |
| Approximate seed rate | Approximately 10 g per 10 × 20 inch tray |
| Germination | Approximately 3–5 days under suitable warm conditions |
| Covered germination | Until germination is established and seedlings begin lifting upward |
| Growing medium | Quality soil, seed-raising mix, coco coir or suitable microgreen medium |
| Growing conditions | Warm conditions with good light and airflow |
| Flavour | Fresh, aromatic and distinctly basil-like |
| Difficulty | Moderate – slower than many beginner brassica microgreens |
What Are Basil Microgreens?
Basil microgreens are young basil seedlings harvested after germination, generally once the cotyledons are fully developed and the first true leaves are beginning to appear.
They are grown much more densely than mature basil plants and harvested only a few centimetres above the growing medium.
The young leaves have a concentrated basil aroma and flavour, making them particularly useful as a fresh garnish for dishes where full-sized basil leaves may be too large.
Basil is a warm-season herb and usually develops more slowly than brassica microgreens such as broccoli, mizuna and mustard. It therefore requires a little more patience, particularly during cooler weather.
Why Grow Basil Microgreens?
- Distinctive fresh basil flavour and fragrance.
- Attractive green leaves and tender stems.
- Excellent culinary garnish for pasta, salads and tomato-based dishes.
- Suitable for indoor production under suitable warmth and lighting.
- No seed pre-soaking required.
- Useful as a standalone microgreen or in speciality mixes.
- Well suited to chefs, restaurants and home growers wanting a strong culinary herb flavour.
- Available in packet and bulk quantities for regular production.
Basil microgreens have also been used in scientific studies investigating the composition and production of young edible plants. For example, researchers have grown Ocimum basilicum as a microgreen crop when studying plant compounds and crop characteristics. View an example of published research involving basil microgreens.
How to Grow Basil Microgreens in 8 Simple Steps
- Prepare your tray. Add approximately 2–4 cm of moist quality seed-raising mix, soil or coco coir and level the surface.
- Sow the basil seeds dry. Do not pre-soak. Spread the seed evenly across the surface without creating thick piles.
- Mist carefully. Thoroughly moisten the seeds with a fine mister. A clear gelatinous coating will form around the seed.
- Cover for germination. Cover the tray to maintain consistent humidity while the seeds germinate.
- Maintain warmth and moisture. Basil prefers warmer conditions and can germinate slowly if it is too cool.
- Introduce the seedlings to light. Remove the cover once germination is established and the seedlings begin pushing upward.
- Water carefully. Once roots are established, bottom water where practical and maintain good airflow.
- Harvest. Basil microgreens are commonly ready approximately 20–25 days after sowing.
What You Need to Grow Basil Microgreens
- Basil Microgreen Seeds
- A shallow growing tray with drainage
- A solid lower tray for bottom watering
- Quality seed-raising mix, soil or coco coir
- A second tray or suitable cover
- A fine spray mister
- Clean water
- Bright natural light or a suitable grow light
- Clean scissors or a harvesting knife
Step 1: Prepare the Growing Tray
Fill a shallow microgreen tray with approximately 2–4 cm of growing medium.
Basil performs particularly well in a fine-textured seed-raising mix or quality soil because its small roots benefit from consistent moisture while the seedlings establish.
Coco coir can also be used.
Level the surface gently and moisten the growing medium before sowing. It should be evenly damp but not saturated.
Step 2: Do Not Pre-Soak Basil Seeds
Basil seeds are mucilaginous. This means they rapidly develop a clear gelatinous coating when exposed to water.
This natural coating helps the seed retain moisture, but it also makes wet basil seeds sticky and difficult to distribute evenly.
For microgreen production, it is therefore usually much easier to sow basil seeds dry and then mist them after sowing.
Step 3: Sow Basil Seeds Evenly
Spread the dry seed as evenly as possible over the prepared growing medium.
For a standard 10 × 20 inch tray, approximately 10 grams of basil seed provides a useful starting sowing rate.
For Seedmart’s commonly used 30 × 35 cm tray, approximately 8 grams provides a similar density based on tray surface area.
These rates should be treated as starting points rather than rigid rules. Seed size, variety, growing medium, humidity and production system can all affect the ideal density.
Basil should not be sown in thick overlapping piles. Dense areas retain more moisture and are more prone to uneven establishment and fungal problems.
Step 4: Mist the Basil Seeds
After sowing, use a fine spray mister to thoroughly moisten the seeds and the surface of the growing medium.
Within a short period, the basil seed will begin developing its characteristic clear mucilage.
Make sure all areas of the tray receive moisture, but avoid flooding the surface or washing the seed into clumps.
Step 5: Cover the Tray for Germination
Cover the tray with another tray or suitable germination cover.
The objective is to create a consistently moist environment while the roots establish.
Basil usually germinates in approximately 3–5 days under suitable warm conditions, although cool conditions can slow germination considerably.
Unlike crops such as peas or sunflower, basil does not generally require heavy weighting during germination.
Check the tray each day and make sure the seeds remain moist without becoming waterlogged.
Step 6: Move Basil Microgreens into Light
Once germination is established and the young seedlings are beginning to lift upward, remove the cover and expose the crop to suitable light.
A bright position with indirect natural light can work well, or use a suitable grow light for more consistent indoor production.
Good light encourages compact growth and stronger green colour.
If basil seedlings become tall, thin and stretched, insufficient light is one possible cause.
Step 7: Water Basil Microgreens Carefully
Basil seedlings need consistent moisture, particularly because their fine roots and young stems can suffer if the growing medium dries completely.
At the same time, persistently wet foliage and saturated growing media can encourage fungal problems.
Once the roots have established, bottom watering is useful because it supplies moisture to the root zone while keeping the foliage relatively dry.
Place a small amount of water in the solid lower tray and allow it to move upward through the drainage holes.
Check the tray before watering again rather than automatically adding water according to a fixed schedule.
Step 8: When to Harvest Basil Microgreens
Basil microgreens are generally slower than crops such as radish, broccoli and mustard.
A typical harvest is approximately 20–25 days after sowing, although temperature, light and the preferred harvest stage will affect crop time.
Harvest when the seedlings are healthy, green and well established, commonly around the stage where the first true leaves are beginning to develop.
Use clean scissors or a sharp harvesting knife and cut the stems just above the growing medium.
Avoid cutting into the soil or pulling up the roots if you want a clean harvested crop.
What Do Basil Microgreens Taste Like?
Basil microgreens have the distinctive fresh, aromatic flavour of basil in a tender young seedling.
The exact flavour can vary with the basil variety, but sweet basil types generally have the familiar herbal character associated with Mediterranean cooking.
Their aroma is stronger and more distinctive than mild microgreens such as broccoli, making a relatively small amount useful for adding flavour to a dish.
How to Use Basil Microgreens
Basil microgreens are particularly suited to dishes where their fresh aroma can be appreciated.
- Sprinkle over pasta immediately before serving.
- Add to tomato and mozzarella dishes.
- Use on pizza after cooking.
- Add to salads and sandwiches.
- Use as a garnish for soups.
- Serve with fresh cheeses.
- Add to Mediterranean-style dishes.
- Combine with other mild microgreens in speciality salad mixes.
- Use as a fresh garnish for restaurant and catering dishes.
Basil microgreens are generally best added fresh or near the end of cooking because prolonged heat can reduce their delicate texture and fresh aromatic character.
Basil Microgreens vs Broccoli Microgreens
Basil and broccoli are both popular microgreen crops, but they have very different flavours and growing characteristics.
| Feature | Basil Microgreens | Broccoli Microgreens |
|---|---|---|
| Flavour | Strong, aromatic basil flavour | Mild, fresh brassica flavour |
| Typical harvest | Approximately 20–25 days | Approximately 8–14 days |
| Pre-soak | No – seed becomes mucilaginous | Not required |
| Growing preference | Warm conditions | Generally more adaptable |
| Best suited to | Growers wanting a distinctive culinary herb flavour | Growers wanting a quicker, mild microgreen crop |
Basil Microgreens vs Mature Basil
Basil microgreens and mature basil can be grown from the same type of seed, but they are harvested at very different stages.
| Feature | Basil Microgreens | Mature Basil |
|---|---|---|
| Sowing density | Densely sown in trays | Plants spaced apart |
| Harvest stage | Young seedlings around the first true-leaf stage | Established plants with developed leaves |
| Typical crop time | Approximately 20–25 days | Several weeks or longer |
| Typical use | Fresh garnishes, salads and speciality dishes | Pesto, sauces, cooking and fresh herbs |
Why Are Basil Seeds Slimy or Jelly-Like?
The clear gel surrounding wet basil seeds is a natural substance known as seed mucilage.
When basil seed absorbs water, the mucilage surrounding the seed rapidly expands and forms a gelatinous layer.
This is a normal characteristic of Ocimum basilicum seed and should not be mistaken for fungal growth.
Scientific research has documented this rapid formation of mucilage when basil seed is hydrated. Research on sweet basil seed mucilage describes how this coating develops around the seed soon after contact with water.
Because the hydrated seeds become sticky, soaking them before sowing makes it difficult to spread them evenly. For microgreens, sowing the seed dry and misting afterwards is generally much easier.
Can Basil Microgreens Be Grown Without Soil?
Basil can be grown using some soilless microgreen systems, including coco coir and suitable hydroponic growing media.
However, basil seedlings remain in the tray longer than fast microgreens such as radish, so reliable moisture management becomes especially important.
A fine soil or seed-raising mix is a straightforward option for beginners because it provides consistent moisture around the developing roots.
Growing Basil Microgreens in Brisbane and Warm Australian Climates
Basil is a warm-season herb, which makes it different from many cool-season brassica microgreens.
In Brisbane and other subtropical areas, basil can grow particularly well when temperatures are warm enough for vigorous germination.
However, warm weather often comes with high humidity, so airflow and careful watering remain important.
During humid weather:
- Do not sow the seed too densely.
- Avoid keeping the growing medium constantly saturated.
- Introduce good airflow once the tray is uncovered.
- Bottom water established crops where practical.
- Avoid leaving foliage wet overnight.
- Keep trays away from extreme afternoon heat.
Common Basil Microgreen Growing Problems
Basil Seeds Have Developed Clear Slime
This is almost certainly normal basil seed mucilage.
The seed naturally forms a transparent gelatinous coating after it becomes wet.
Do not repeatedly add extra water simply because the seed looks glossy or wet.
Basil Seeds Are Germinating Slowly
Basil is a warm-season plant and can germinate more slowly in cool conditions.
Make sure the tray is warm enough, consistently moist and protected from drying during germination.
Unlike radish or broccoli, basil is not necessarily a good crop to judge after only two or three days.
Basil Microgreens Are Growing Unevenly
Uneven growth can result from irregular seed distribution, uneven moisture, cool areas within the tray or seed being washed into clumps during watering.
Sow dry seed carefully and use a fine spray when initially moistening the tray.
Basil Microgreens Are Tall and Leggy
Leggy growth can indicate insufficient light.
Once germination is complete, provide bright natural light or a suitable grow light and avoid leaving the seedlings covered for unnecessarily long periods.
Basil Microgreens Are Developing Mould
Excess moisture, poor ventilation and excessive sowing density can encourage mould.
Keep the growing medium moist rather than saturated, allow air to circulate around established crops and avoid continually wetting the foliage.
Basil Seedlings Are Falling Over
Weak seedlings can result from excessive moisture, poor airflow, insufficient light or problems around the stem and root zone.
Check the growing medium before adding more water and inspect the base of the seedlings for signs of deterioration.
Can Basil Microgreens Be Grown Indoors?
Yes. Basil microgreens are well suited to indoor growing where warmth, moisture, light and airflow can be controlled.
A bright windowsill can work for a small crop, provided the tray receives sufficient light without being exposed to excessive heat.
For more consistent crops, particularly during short winter days, a suitable grow light can be used.
For broader advice on trays, growing media, lighting, blackout and watering, see Seedmart’s complete guide to growing microgreens in Australia.
Frequently Asked Questions
How long do basil microgreens take to grow?
Basil microgreens are commonly ready approximately 20–25 days after sowing. They are slower than many brassica and radish microgreens.
Do basil microgreen seeds need to be soaked?
No. Pre-soaking is not normally recommended because basil seed becomes surrounded by sticky gelatinous mucilage when wet, making the seed difficult to spread evenly.
Why do basil seeds become slimy?
Basil seeds naturally produce a clear mucilaginous coating after hydration. This is normal and is not, by itself, a sign of mould.
How much basil seed should I use per tray?
Approximately 10 grams per 10 × 20 inch tray is a useful starting sowing rate. For a 30 × 35 cm tray, approximately 8 grams provides a comparable starting density.
How long do basil microgreen seeds take to germinate?
Under suitable warm conditions, germination commonly occurs in approximately 3–5 days. Cooler temperatures may lengthen germination time.
Do basil microgreens need blackout?
Basil benefits from being covered during initial germination to help maintain consistent moisture. Once germination is established and the seedlings are beginning to lift upward, remove the cover and provide suitable light.
Do basil microgreens need light?
Yes. After germination, basil microgreens require good natural or artificial growing light to develop compact green seedlings.
Can basil microgreens be grown without soil?
Yes. Coco coir and suitable soilless microgreen media can be used. A fine quality soil or seed-raising mix is also a straightforward option, particularly for beginners.
What do basil microgreens taste like?
Basil microgreens have a fresh, aromatic basil flavour similar to mature basil but in a tender young seedling.
When should basil microgreens be harvested?
Harvest is commonly around 20–25 days after sowing, generally when the seedlings are well developed and around the first true-leaf stage.
Can basil microgreens be grown in summer?
Yes. Basil prefers warmth and can perform well during warmer weather. In humid climates, pay particular attention to ventilation and avoid excessive watering.
Are basil microgreens the same as basil sprouts?
No. Basil microgreens are grown on a growing medium and harvested by cutting above that medium. Conventional sprouts are generally germinated without soil and consumed with the root and remaining seed. Basil’s mucilaginous seed makes it better suited to tray-grown microgreen production than conventional jar sprouting.
Where can I buy basil microgreen seeds in Australia?
Seedmart supplies Basil Microgreen Seeds in packet and bulk quantities for home growers, chefs and commercial microgreen growers throughout Australia.
Basil takes a little longer to grow than many beginner microgreens, but the process is straightforward once you understand how its mucilaginous seed behaves.
Sow the seed dry rather than soaking it, keep the growing surface consistently moist during germination, provide warmth, move the seedlings into good light once established and water carefully as the crop develops.
With suitable growing conditions, fresh basil microgreens can usually be harvested approximately 20–25 days after sowing.
Shop Basil Microgreen Seeds from Seedmart Australia.