Why is My Agapanthus Not Flowering?

Last Updated on October 31, 2022 by admin

Agapanthus (also called Lily of the Nile as well as African Lily) is a flowering herbaceous perennial that will flower in the summer months with huge blue flowers.

The causes of Agapanthus not blooming is due to lack of sunshine, a boggy soil and damaged flower buds by frost excessive nitrogen, or due to transplant shock resulting from recent plantation, potting or division.

Agapanthus needs full sunlight, well-drained soil, winter protection and time to establish following the planting in order to show flowers.

Continue reading to find out your agapanthus isnt blooming and the best way to make sure that agapanthus flowers next summer…

Agapanthus not blooming after planting or Potting, or Dividing

Agapanthus typically has fewer flowers the initial year following planting, repotting or division of roots that are clustered because of transplant shock and the possibility of damage to the roots of the plant when they divide.

The majority of gardeners cultivate their agapanthus in a different location from the optimal South Africa climate and conditions and it may take the plant some time to adjust to the new conditions since agapanthus are typically grown in greenhouses that are temperature controlled that is in the best conditions prior to when you buy the plant.

So the difference between an indoor greenhouse that is controlled to your garden could be quite a shock to the agapanthus, which could stop it from blooming.

In the initial year of planting , most of the plants energy is focused on developing and establishing root system in soil, and to forming its lush green leaves rather than displaying flowers.

Remember that the best time to potting is in the spring before the plant begins to grow however it is possible to successfully divide the plant during Fall.

Re-potting or splitting in the spring allows the agapanthuss roots to establish its roots while the soil is warming and before it must face the summer heat which could cause it to be more susceptible to drought, and consequently the environment is not optimal for the development of flowers.

It is important to water agapanthus properly in its first year , and then feed it with a fertilizer made of potash after August to encourage the growth of buds for the next years flowering and if it is in full sun and has well draining soil , it will show flowers in the next year.

Check out this YouTube video for an illustrated guide to the best methods of repotting and dividing agapanthus:

Protect the Flower Buds in Winter

The majority of Agapanthus cultivars are drought-tolerant, but not frost-tolerant, and needs the protection of freezing temperatures in winter if it plans to bloom (USDA zones 9-11). zones 9-11).

The buds of agapanthus flowers develop in the fall and then the flowers are displayed next year.

In cold climates, the flower buds are vulnerable to damage from frost that prevents the growth of agapanthus flowers the next Spring.

Solution: In order to stop the flower buds of agapanthus from suffering damage from frost, grow agapanthus in pots , then transfer them to a protected and frost-free area (such as an outdoor garden house).

You can also make use of fleece (available at garden centers or on Amazon) which is specifically designed to protect the plant and keep the cold out , ensuring that the flowers remain unharmed.

If you plan to plant agapanthus in your garden boarders, then I suggest a deciduous variety instead of the evergreen ones as they are less prone to cold. However, it is important to shield the agapanthus flower buds by covering them with fleece or an organic mulch like straw during winter.

With the insulation of the cold the buds of your flower remain in good condition throughout Winter, and your agapanthus will show flowers during the spring.

Utilize a Fertilizer with a high Potash Content to encourage more Agapanthus Flowers

The use of fertilizers in excess can cause agapanthus plants to develop more foliage , at the cost of flowers.

Do not use any fertilizers with high nitrogen levels (as it results in an agapanthus that has lots of green leaves but none of the flowers) and apply a balanced 10:10:10 NPK all-purpose fertilizer to start spring (also adhere to the manufacturers recommendations).

The application of fertilizers is typically more crucial for agapanthus grown in pots and containers since there is less room for nutrients than in garden boards when the area of planting was altered with organic material prior to hand.

The most important thing to encourage the blooming of agapanthus is to use an agapanthus feed that is rich in Potash (Potassium) following the deadheading of the blooms from this years.

Agapanthus produces flower buds around the end of summer or in the early fall. The buds that are developing need to be kept safe throughout winter to allow them to show off their flowers later in the Spring.

A fertilizer with high potash content helps to stimulate the growth of flower buds, so you should change to a fertilizer that has more potash (available through Amazon or gardens centers) to provide the plant with the correct nutrients at the right timing.

Apply a potash feed once the flowers of this year have started to fade from August to October (always adhere to the manufacturers instructions) because this stimulates the agapanthus plant to grow additional flower buds that can be displayed in the spring.

Agapanthus Prefers Full Sun for Flowering

Agapanthus are drought-tolerant they thrive under full sun , with at least six hours of sunshine per day.

The amount of sunlight is directly related to the blooms, therefore if your agapanthuss is not blooming, it could be due to it being planted in a shaded area or is shaded by plants around it.

Potted plants must be relocated to a sunnyand warm area if they are in shade However, agapanthus must be moved (Ideally in the spring or fall) and then planted on the sunnier area of a garden boarder.

It is recommended to avoid the digging of agapanthus, and then planting it in the summer months since it needs time to grow and transplanting it in summer heat could result in the plants to dehydrate and die before the roots are able to grow so that they can draw in water.

Watering and Soil Conditions for Agapanthus Flowering

Agapanthus originates from South Africa where it grows in soil that is very well drained in meadows of the mountains.

In terms of gardening, think of the soil and watering requirements for agapanthuss growth as comparable to the conditions for growing Mediterranean plants like Lavender, Rosemary and Thyme and have a good tolerance to drought , and a preference for soil that is dry between periods of watering or rain.

A well-drained soil is essential because they are prone to fungal and rotting diseases when grown in a boggy soil which can cause stress and hinders plants from blooming. Therefore, avoid planting agapanthus on clay soil that is heavy.

Agapanthus requires a lightly sandy soil, which has ideally been amended with compost , and possibly something like grit or sand in order to enhance drainage, especially when you reside in a region that has a high amount of rainfall.

Agapanthus thrives best in containers and pots because of the favorable drainage conditions.

In the majority of climates, you should water potted agapanthus at least once every week in the spring and summer with an adequate soak to help roots to grow to ensure the plant is well-nourished so that it can bloom while agapanthus that is planted in soil that is used for gardening rarely needs any watering following its first year plantation.

Key Takeaways:

  • The primary reason agapanthus fail to bloom is due to not enough sunlight, or too much fertilizer, or the flower buds get damaged by frost, in boggy soil or because of stress following the planting, repotting or division.
  • Agapanthus flowers in well-draining soil, protected from frost, and usually flowers more abundantly a year following planting.
  • A fertilizer application that has more potash (potassium) during August may stimulate flower buds to grow that will be visible in the coming year.
  • Agapanthus blooms and is best in full sun with adequate drainage.


Went from an inexperienced gardener to a half-decent one over 10+ years. I cover anything from general indoor plant guides and lawn care, to succulents and flowers. Super happy to share my tips and tricks with you :)