Growing basil is straightforward and rewarding. Whether starting from seeds or stems, the process is simple enough that many gardeners have stopped buying basil altogether. It truly is a plant that keeps on giving.
You can grow basil from a cutting. Cut a healthy 4 to 6 inch stem, remove the lower leaves, and place the stem in water. Keep it in indirect sunlight, changing the water every few days. Once roots are 2 inches long, plant the cutting in soil.
Now that you know the basics of propagating basil, let’s dive into the details of each method. From sowing seeds to using cuttings, here you’ll find clear steps and helpful tips to get your basil growing strong.
A FEW WAYS TO PROPAGATE BASIL
You can easily propagate basil using a few different methods. The most common way is to start from seeds and sow basil directly into your garden. Seeds can germination in about 5 to10 days. Another propagation method involves using basil cuttings and placing them in water or soil. These methods are simple and effective, allowing you to enjoy fresh basil throughout the growing season. This article will guide you through the steps of propagating basil using seeds, rooting basil cuttings in water, and rooting cuttings in soil, along with tips on avoiding common mistakes. Thanks to NatureNow for this basil sprouting gif.
PROPAGATING BASIL FROM SEEDS
Starting Basil Seeds Indoors vs. Outdoors
If you’re going to start basil from seeds you will need to choose if you will be starting them inside or outside. Your choice will depend on your preference and local climate. Many home gardeners do start basil seeds indoors to take advantage of the controlled environment and to get a jump start on the growing season. However, in regions with mild climates and long growing seasons, some gardeners might directly sow basil seeds outdoors.
Sowing basil seeds directly into the garden can be beneficial if you don’t have time to care of indoor seedlings. This also saves you the cost of materials like potting soil, seed trays, and grow lights. Additionally, starting your plants outdoors eliminates the need to acclimate them to the outside environment, thus avoiding the risk of transplant shock.
Propagating basil seeds indoors offers several benefits and could be right for you. Basil propagated indoors has the benefit of growing in a temperature, humidity, and light controlled environment. Gardeners can extend the growing and harvesting season of basil by growing basil indoors before Mother Nature is finished spring frosting her outside domain. Planting basil seed indoors protects basil from common basil pests like the Japanese beetle, snails, and aphids.
Propagating basil from seeds is a straightforward process. Depending on your climate and growing conditions, you can start basil seeds either indoors or outdoors.
Sowing Basil Indoors
In zones 5 or 6, where winters are colder, it’s often better to start basil seeds indoors about 6 to 8 weeks before the last expected frost. Indoors, you can control the temperature, light, and moisture levels, creating an ideal environment for germination and early growth. This head start ensures the plants are strong enough to handle outdoor conditions when transplanted.
- To sow basil seed indoors:
- Use seed trays or small pots filled with a light, well-draining soil mix.
- Plant the seeds about 1/4 inch deep, cover them lightly with soil, and keep the soil moist.
- Place the trays in a warm, sunny spot or under grow lights.
- Seeds should germinate in 5 to 10 days.
After your seeds are settled in their soil, you still have a lot to do. Basil seeds germinate best at temperatures between 70 to 75°F (21-24°C). Maintain a warm environment, possibly using a seedling heat mat to ensure consistent warmth.
Because basil seeds are so small it is best to water your seeds with a spray bottle or a fine mist watering can to avoid disturbing the seeds. Keep the soil consistently moist but not waterlogged. Check the soil daily and water as needed.
Basil seeds need plenty of light to germinate. Place the seed trays in a sunny location where they can receive at least 6 to 8 hours of direct sunlight daily. If natural light is insufficient, use fluorescent or LED grow lights placed a few inches above the trays.
Cover the seed trays with a clear plastic dome or plastic wrap to create a humid environment, which helps retain moisture. Remove the cover once the seeds germinate and sprouts appear.
Sowing Basil Outdoors
In warmer climates or regions with milder winters, you can sow basil seeds directly in the garden after the last frost date. Basil typically takes about 6 to 8 weeks to grow from seed before you can begin harvesting. Therefore, it can be planted in late spring or early summer once the risk of frost has passed in zones 5 or 6. However, keep in mind that the shorter growing season may limit the amount of basil you can harvest.
- To sow basil seed outdoors:
- Choose a sunny spot with well-draining soil, and plant the seeds 1/4 inch deep.
- Keep the soil moist until the seeds germinate.
- Direct sowing can be successful if you keep seeds consistently moist and protected from any unexpected cold snaps.
Care Tips for Seedlings
Transplanting Basil Seedlings: Seedlings need plenty of light and consistent moisture to grow strong. If starting indoors, gradually acclimate the seedlings to outdoor conditions by placing them outside for a few hours each day, increasing the time over a week before transplanting them to the garden.
Thinning Basil Seedlings: Once the seeds have sprouted, thin them out to prevent overcrowding. When you’re ready to plant your basil outside, keep in mind that basil roots typically grow about 6 to 12 inches deep and can spread outwards to about 12 inches. This shallow root system makes basil suitable for container gardening as well as garden beds, but it also means that the plants require consistent watering and good soil drainage to thrive. The shallow and spreading nature of basil roots means they will be competing for nutrients from the upper layers of the soil. Space basil plants about 12 to 18 inches apart.
PROPAGATING BASIL BY CUTTINGS
Cutting Tools: Whether you are growing your basil cuttings in water or soil, you need to cut the basil carefully. Using a clean instrument to take basil cuttings is important to prevent the spread of diseases and infections. Dirty tools can harbor harmful bacteria, fungi, and viruses that can easily be transferred to the basil plant, potentially causing issues like wilting, discoloration, and poor growth. Additionally, clean cuts made by sharp, sanitized tools are less likely to damage the plant tissue, allowing for quicker healing and reduced stress on the plant.
How to Cut Basil for Propagation: When you place a basil cutting in water or soil, the part that roots is typically at the leaf nodes. Leaf nodes are the points on the stem where leaves attach, and they contain meristematic tissue, which has the potential to develop into roots. When you place the basil cutting in water, roots will often emerge from these nodes, making it essential to ensure that at least one or two leaf nodes are submerged in the water to encourage successful rooting. Some gardeners find that basil stems that are flowering do not have a high success rate for cutting propagation. Choose stems that have not gone to seed and are not flowering.
To grow basil from a cutting, start by choosing a healthy basil plant and cut a 4 to 6 inch stem just below a leaf node. Remove the lower leaves, leaving a few at the top. Submerge the basil stem in a glass of water or moist soil.
Rooting Basil Cuttings in Water
Place the basil cutting in a glass of water, ensuring the lower part of the stem is submerged. It is easiest to keep track of your basil’s rooting progress if you use a clear glass. Keep the glass in a bright area with indirect sunlight, such as a windowsill. You should see roots forming within 1 to 2 weeks.
You can root several basil cuttings in one glass of water. Make sure the cuttings have enough space and are not too tightly packed. This allows for better air circulation around the upper leaves and stems and reduces the risk of mold and rot.
While you are waiting the 1 to 2 weeks for the basil to root, change the water regularly. Fresh water is oxygenated and clean, important for healthy roots. Stagnant water can become depleted of oxygen and may harbor bacteria, which can negatively affect the rooting process. Signs that it is time to change the water for basil cuttings include cloudiness or an unpleasant odor. Over time water will evaporate. Keep the water for your basil cuttings topped off so the leaf nodes at the bottom remain submerged.
Maintain a stable temperature and avoid direct sunlight, which can scorch basil cuttings. Direct sunlight can quickly heat up the water, which can cause the cuttings to wilt or become stressed. High temperatures can damage the delicate stems and impede root development. Sunlight can promote the growth of algae in the water. Algae can consume oxygen and nutrients, making the environment less favorable for the basil cuttings to root. Cuttings are in a vulnerable state, and too much sunlight can cause additional stress. Indirect light provides enough energy for the cuttings to photosynthesize without overwhelming them.
Once the roots are about 2 inches long, the cutting is ready to be transplanted into soil.
Propagating Basil Cuttings in Soil
Soil Requirements and Method: You can also propagate basil cuttings directly in soil. Choose a light, well-draining potting soil. A mix with smaller soil granules will do a better job of holding moisture closer to the roots. Remove all of the lower leaves and dip the cut end of the stem in rooting hormone (optional for faster rooting).
Some basil growers use aloe vera instead of rooting hormone. Aloe vera contains several compounds that promote root growth and protect cuttings from infections. Auxins regulate plant growth, while gibberellins promote cell division. Polysaccharides and saponins have protective properties. Salicylic acid and amino acids support the plant’s immune response and overall health. These aloe vera compounds work together to improve the rooting environment and protect the cuttings from potential infections.
Plant a basil cutting in a small pot with moist soil. The leaf nodes should be covered by the soil and the stem of the basil cutting should be deep enough to stabilize the cutting so it can stand straight.
Basil cuttings propagated in soil do best in a moist environment. The cuttings are fragile and have been cut off from their root system so they need steady moisture to continue to live. To create a humid environment, cover the pot with a plastic bag to form a mini greenhouse. This helps retain moisture but note that it also poses a risk of mold. To avoid mold, ensure the soil is moist but not waterlogged, and occasionally open the bag for air circulation.
Signs of Root Growth: Roots typically develop in 2 to 4 weeks. You can check for root growth by gently tugging on the cutting; resistance indicates that roots have formed. When new leaves start to grow, it’s a sign that the cutting is established. Gradually remove the plastic bag once the cutting shows signs of new growth.
IS WATER OR SOIL BEST FOR BASIL CUTTING PROPAGATION?
You may have noticed that a basil cutting propagated in soil can take about two weeks longer to root compared to one propagated in water. Several factors contribute to this difference. In water, cuttings have direct access to oxygen, which promotes faster root growth. Additionally, the constant moisture in water supports root development. In contrast, soil provides a less consistent moisture level, which can affect rooting. If the soil is too dry or too wet, it can slow down the rooting process. Moreover, propagating basil cuttings in soil requires them to adapt to a more complex set of conditions, which can extend the rooting period.
Basil seedlings generally do well whether they were rooted in soil or water. However, there are pros and cons to both methods.
The Pros and Cons of Rooting Basil in Water: You can easily see root development and know when the cuttings are ready to be planted. The basil roots are always in contact with water, which can reduce initial transplant shock to the rootless cutting. However, there is a possibility for transplant shock after the basil has rooted and you place it in soil. Water alone does not necessarily provide nutrients to rooting basil.
The Pros and Cons of Rooting Basil in Soil: The seedlings grow directly in the soil they’ll be staying in, reducing the risk of transplant shock. Soil provides immediate access to nutrients, which can support stronger growth from the start. However, soil moisture must be carefully managed to avoid being too dry or too wet. It can be tricky, even with a bag covering the potted basil, to manage moisture and avoid mold. Many basil growers choose not to propagate in soil for this reason.
In summary, if you want to ensure strong root development before planting, rooting in water might be beneficial. If you prefer a more straightforward transition without moving the cuttings, rooting directly in soil could be better. Both methods can lead to successful basil seedlings with proper care.
COMMON BASIL PROPAGATING MISTAKES TO AVOID
Successfully propagating basil involves understanding the specific needs and potential pitfalls of each method. Whether you’re starting from seeds, cuttings in water, or cuttings in soil, each technique has its own set of common errors to avoid. Here’s a guide to help you navigate these methods effectively.
Mistakes to avoid when Propagating Basil with Seeds
Indoor Basil Seed Starting Cautions:
- Inadequate Light: Basil seeds need plenty of light to germinate. Ensure they get 12 to 16 hours of bright, indirect light daily, either from natural sunlight or grow lights.
- Overwatering: Excessive moisture can lead to damping-off disease. Keep the soil moist but not soggy.
- Improper Soil: Use well-draining seed-starting mix rather than garden soil, which can be too heavy and prone to retaining too much moisture.
- Temperature Fluctuations: Basil seeds require consistent warmth (70 to 80°F or 21 to 27°C). Avoid placing them in drafty or cooler areas.
Outdoor Basil Seed Starting Cautions:
- Planting Too Early: Basil is sensitive to frost. Wait until all danger of frost has passed and the soil is warm (at least 60°F or 16°C) before sowing seeds.
- Poor Soil Preparation: Ensure the soil is well-drained and enriched with organic matter. Avoid heavy, clayey soils that can impede seedling growth.
- Crowding: Space seeds adequately to prevent overcrowding, which can lead to weak plants and increased disease risk.
Common Mistakes when Propagating Basil with Cuttings
Growing Basil Cuttings in Water Cautions:
- Submerging Leaves: Avoid submerging the leaves in water, as this can cause rot and taint the water. Only the leaf nodes should be underwater.
- Dirty Containers: Use clean containers to prevent bacterial or fungal contamination. Regularly change the water to keep it fresh.
- Direct Sunlight: Don’t place cuttings in direct sunlight, which can heat the water and stress the plants. Opt for bright, indirect light.
- Neglecting Temperature: Maintain a consistent, warm temperature (70 to 80°F or 21 to 27°C) to encourage root growth.
Growing Basil Cuttings in Soil Cautions:
- Planting Too Deep: Insert cuttings just deep enough to cover the leaf nodes. Planting too deep can hinder root development and cause rot.
- Overwatering or Underwatering: Keep soil moist but not waterlogged. Ensure good drainage to prevent root rot.
- Inadequate Light: Provide sufficient light for the cuttings, ideally bright, indirect light. Lack of light can lead to weak growth.
- Poor Soil Quality: Use a well-draining potting mix rather than garden soil, which can be too heavy and retain too much moisture.
Avoiding these mistakes will help ensure successful propagation of basil, whether you’re using seeds or cuttings.
TRANSPLANTING AND POTTING TIPS
If you are growing basil cuttings in water, wait until the roots are approximately 2 inches long before moving the cuttings to soil.
Choosing the Right Pot Size: If you are keeping your basil indoors, choose a pot that is at least 6 to 8 inches in diameter to allow room for growth. Harvest regularly to encourage bushy growth and prevent the plant from outgrowing its pot.
When to Transplant: Transplant your basil plants outdoors when they have several sets of true leaves and a well-developed root system. Wait to transplant your basil until the threat of frost has passed.
A WORD ABOUT DIVISION
Though not true propagation, dividing basil plants can help them thrive. Grocery store basil often has multiple, crowded plants in one pot, competing for nutrients. Carefully separating and replanting them gives each plant more space to grow robustly.
IN CONCLUSION
Propagating basil is a rewarding process that can guarantee you will have a steady supply of this aromatic herb. Whether you choose to start from seeds, water cuttings, or soil cuttings, following these guidelines will help you grow strong, vibrant basil plants.
BLOOPERS
Our basil in glass banner under the heading “Rooting Basil Cuttings in Water” above is a.i. generated. You’ll notice an over abundance of leaves. This would not be advantageous for your propagation. The cutting would struggle to support that much leaf life up top and sprout new roots at the same time.
For your viewing enjoyment: Check out more of our collection of a.i. basil image mistakes for this article. You can count the things wrong. Do you see leaves under water? crazy roots, overcrowding, cuttings with too much leaf matter on top?
My Personal Propagation BLOOPERS: I really have enjoyed researching the propagation of basil. I’ve actually propagated basil many times, especially purple basil (yum). I just don’t have any pictures. But in full transparency, I know about propagating with baggies and the mold problem. Here is a picture of stevia in a bag on a windowsill, working dutifully on it’s roots. but when I’d open the bags, the stevia would wilt. I decided to just let them be, sealed, in their happy little sandwich bags. When I opened the bags a few days later with no airing out… Well, you guessed it. Look at the mold in that pot. The dead stevia cutting is another mistake. I cut that stevia cutting above the node. There were no leaf nodes under soil so it could not make new leaves. The next picture is of rosemary. The mistake there is the leaves under water, but you can see the new root growth. It takes rosemary a few weeks to grow roots in water so I was glad that I could monitor its progress through the clear glass. I really should have trimmed up the leaves higher so the rootless plants could support less on top and focus more on roots. And, as mentioned in my article, so under-water leaves didn’t spoil the water. Just in case you want to run off and propagate rosemary before I write that article, you have to rough up the woody stem first so the water can get through and the root have a path out. I simply scraped a butter knife up the stem to make it a little scruffy. Worked like a charm.
