Osteospermum not flowering

Why Is My Osteospermum Not Flowering? Causes & Remedies

Are you wondering why your beautiful Osteospermum, also known as the African Daisy, isn’t showing off its stunning blooms? These vibrant, daisy-like flowers can bring a touch of charm and color to any garden or container, but when they fail to flower, it can be quite disheartening. In this comprehensive guide, we’ll explore the common reasons your Osteospermum might not be flowering and provide practical solutions to help your plant reach its full blooming potential. From lighting and watering to nutrients and pruning, we’ve got you covered in your quest for a flourishing African Daisy.

Initial Factors to Consider

Plant Age

Osteospermum may not flower for several reasons. One possible reason is the age of the plant. Young plants may not yet have developed enough to produce flowers, while older plants might be past their prime blooming period. It is essential to give the plant some time to grow and establish itself, as flowering usually occurs during its second year.

Plant Variety

Another factor to consider when trying to determine why your Osteospermum is not flowering is the specific variety of the plant. Some varieties flower only under specific environmental conditions, while others may have different blooming periods. Familiarize yourself with the unique characteristics of the Osteospermum variety you have, and make sure you are providing the appropriate growing conditions to encourage flowering.

Overall Health

The overall health of the African Daisy plant could also influence its flowering. Some critical factors to ensure the plant’s wellbeing include proper sunlight, watering, and nutrition. Insufficient sunlight may lead to a lack of flowering, so make sure your Osteospermum is receiving enough direct sunlight daily. Similarly, overwatering or poor drainage can lead to root rot and other issues, preventing flowering. Lastly, ensure the plant receives adequate nutrients by regularly applying an appropriate fertilizer to support healthy growth and flowering.


Consider these factors to determine why your Osteospermum isn’t flowering: plant age (young or old plants may not flower), variety (different blooming periods and conditions), and overall health (ensure proper sunlight, watering, and nutrition). Familiarize yourself with your plant’s specific needs and adjust its care accordingly.

Environmental Conditions

Osteospermum not flowering

Various environmental factors can influence the flowering of Osteospermum plants. They can also influence the lifespan of your Osteospermum. Two critical conditions that greatly affect the plant’s ability to bloom are lighting and watering. Ensuring that these needs are met will promote healthy growth and blooming in your Osteospermum.

Inadequate Lighting

Daisies require adequate sunlight to encourage flowering. They perform best when exposed to full sun or partial shade. A lack of sufficient light can result in limited or no blooms on the plant. To address this issue, move the plant to a brighter location, ensuring it receives at least 6 hours of sunlight per day. In regions with scorching hot temperatures, providing some shade during the hottest part of the day could also prevent your Osteospermum from wilting and promote flowering.

Improper Watering

Watering plays a significant role in the ability of Osteospermums to produce flowers. These plants, being semi-succulent, prefer well-draining soil and do not thrive in consistently wet conditions. Over-watering can result in root rot or other diseases, which can ultimately prevent the plant from flowering.

To prevent this problem, make sure to water your Osteospermum plants thoroughly, allowing the soil to dry somewhat between waterings. Ensure that the container or garden bed has proper drainage to avoid waterlogging the roots. Additionally, monitoring your plant’s moisture needs during fluctuating weather conditions is crucial, as either too much or too little water can hinder the plant’s ability to flower.


Environmental factors, like lighting and watering, impact Osteospermum flowering. Ensure sufficient sunlight (6+ hours daily) and proper watering to promote blooms. Avoid over-watering, as these semi-succulent plants prefer well-draining soil. Monitor moisture needs during weather fluctuations to encourage flowering.

Nutrient Deficiencies

African daisy requires specific nutrients in the right balance to produce healthy blooms. When these nutrients are lacking, your Osteospermum may not flower as expected. This section will discuss the impact of soil quality on nutrient deficiencies and how it can affect the plant’s ability to produce flowers.

Soil Quality

Soil quality plays a crucial role in the health and growth of Osteospermum. If the soil lacks proper nutrients or has poor drainage, the plant may struggle to produce flowers. Here are some key factors to consider:

  • pH Level: Osteospermum thrives in soil with a pH level between 6.0 and 6.2. If the pH level is too low (acidic) or too high (alkaline), it may cause nutrient deficiencies, preventing the plant from flowering.
  • Drainage: Well-drained soil is essential for Osteospermum, as it does not tolerate constant wetness. Poor drainage can lead to root rot and other diseases, which can hinder the plant’s ability to produce blooms
  • Nitrogen: Osteospermum requires a constant feed, starting with 200 ppm nitrogen. However, excessive feeding, especially with ammonium-based fertilizers, can cause elongation and inhibit the development of flowers.
  • Micronutrients: Micronutrients like iron, manganese, and zinc also play a vital role in the blooming process. Deficiencies in these nutrients can lead to poor flower production and overall plant health.

To improve soil quality and ensure your Osteospermum receives the necessary nutrients, follow these tips:

  1. Test the pH level of your soil and adjust it accordingly, using amendments like lime (to raise the pH) or sulfur (to lower the pH).
  2. Ensure proper drainage by cultivating the planting area with organic matter or amending with sand if soils are heavy clay.
  3. Feed your plants with a balanced fertilizer, rich in essential nutrients. Be sure to follow the recommended application rates to avoid over-fertilizing.
  4. Monitor your plants for signs of deficiencies and address them promptly by applying the necessary corrective measures, such as foliar sprays for micronutrient deficiencies.


Nutrient deficiencies can hinder Osteospermum flowering. Prioritize soil quality, pH level (6.0-6.2), drainage, nitrogen, and micronutrients. Test and adjust soil pH, ensure proper drainage, apply balanced fertilizer, and monitor plants for deficiencies. Proper soil quality and nutrient balance encourage abundant blooms.

Trimming and Deadheading

Trimming and deadheading are essential practices to promote healthy growth and flowering in osteospermum plants. Regular maintenance helps to encourage the production of new blooms, ensuring your African daisies remain vibrant and attractive throughout the season.

Deadheading involves removing wilted or spent flowers from the plant. This process keeps the plant from going to seed, which can cause blooming to cease earlier than desired. To deadhead osteospermum, simply take sharp, clean scissors and cut the flower stem below the deadhead. This should be done for each wilted flower, maintaining the overall appearance and health of the plant.

Pruning, on the other hand, requires slightly more attention to detail. The objective is to trim away any overgrown or damaged stems and foliage, promoting a well-balanced plant structure. To prune osteospermum, locate stems with spent flowers and cut them back to just above a rosette of leaves. If a single flower is the only one past its peak on a stem, remove that stem from the main stem.

Consistent care and attention, particularly through pruning and deadheading, will support your osteospermum in producing an abundance of beautiful blooms throughout its growing season. Remember to also provide the plant with sufficient water and regular feeding using appropriate fertilizers for optimal growth and flowering.


Trimming and deadheading promote healthy growth and flowering in Osteospermum. Deadheading removes spent flowers, while pruning trims overgrown or damaged stems and foliage. Consistent care, sufficient water, and regular feeding with appropriate fertilizers encourage abundant blooms throughout the growing season.

Other Issues That May Stunt Gorwth

To maintain proper Osteospermum growth and flowering, implement a strong pest and disease management strategy. Aphids and powdery mildew are two common issues affecting flowering.

Aphids can attack leaves and flower buds, causing stunted growth. To manage aphid infestations:

  1. Regularly inspect plants for aphids on new growth and flower buds.
  2. Introduce natural predators like ladybugs and lacewings.
  3. Apply insecticidal soap or neem oil as needed.

Powdery mildew, a fungal disease, can appear as white or gray growth on leaves and stems. To manage powdery mildew:

  1. Provide proper air circulation and spacing between plants.
  2. Water plants at the base to prevent favorable fungal conditions.
  3. Use fungicides, such as sulfur or potassium bicarbonate, as directed.
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