Why Is My Agapanthus Not Flowering? ( Top 9 Reasons )

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The Agapanthus is a relatively common flower in our gardens, it is a perennial plant that produces large blue, pink, or even white flowers. In ideal conditions the Agapanthus should flower in June-July, however, this flowering period can be delayed for several reasons, and in the worst-case scenario, the Agapanthus will simply not flower. If your Agapanthus plant is growing leaves, but still hasn’t flowered then don’t worry you will find the reason for it below.

Your agapanthus may not be flowering for various reasons, including inadequate watering, insufficient sunlight, lack of nutrients in the soil, or being too young to bloom. It is not uncommon for agapanthus to have difficulties in blooming as they can be quite stubborn in this regard.

If you live outside the preferred hardiness zone of the Agapanthus then my personal recommendation is to grow them in bottom watering pots that are also self watering Click here to check it out on Amazon.com

There are hundreds of different types of Agapanthus plants, like Agapanthus Luly, Agapanthus Loch Hope, Agapanthus Arctic Star, and so on. While most Agapanthus have more or less the same requirements in order to be able to flower, but there are several small differences between these plants that impact how and if they actually flower. If you planted your Agapanthus last year, then the odds are that it won’t flower this year, and this is normal.

Young plants focus on growing as big as they can, and they will only flower if they have enough nutrients, water, and plenty of sunlight. In the case of the Agapanthus plant, it takes around 2 years until the plant is mature enough to actually flower. If you want to know more about Agapanthus then check out my recent article Agapanthus Africanus ( Lily Of The Nile, African Lily ).

Why Is My Agapanthus Not Flowering?

If your Agapanthus is not flowering, there could be several reasons behind it. One common reason is insufficient sunlight. Agapanthus plants require full sun to produce abundant blooms, so if they are not receiving enough direct sunlight, they may not flower properly. Another factor could be improper fertilization. Agapanthus plants benefit from regular feeding with a balanced fertilizer to promote healthy growth and flower production. If you haven’t been fertilizing your plant or using the wrong type of fertilizer, it may affect its ability to bloom.

Additionally, overcrowding can also hinder flowering. Agapanthus plants prefer to have enough space to grow and spread their roots, so if they are planted too closely together, they may not have the energy to produce flowers. Lastly, extreme temperature fluctuations or inconsistent watering practices can also impact flower production. Ensure your Agapanthus is planted in well-draining soil, watered regularly, and protected from extreme temperature swings.

Due Frost Damage

Agapanthus plants are sold in almost every single state, however, this doesn’t mean that they will grow well. Agapanthus are hardy in Zones 8-10, they will most likely survive if you plant them outside their preferred hardiness zone but the plant will definitely struggle. In areas with cold winters, the plant will suffer from frost damage, which will hinder its ability to grow new leaves and flowers. In the worst-case scenario, the plant will simply not survive the frost damage or it will get root or bulb rot.

Not only do you have to protect the plant from frost damage but the flower buds as well. The flower buds of the Agapanthus are especially prone to frost damage, either cover it up with a plastic bag or simply bring the plant inside for the winter. Frost damage oftentimes occurs when you plant the bulbs too early, for more information check out my recent article What Happens If You Plant Bulbs Too Early ( August – September ).

Due To Cut Flower Buds

Most people do at least some kind of maintenance in their garden during autumn, and oftentimes this is when they simply cut down the Agapanthus flower buds without even knowing. The Agapanthus produces flower buds in late summer or autumn, these buds will flower next year. So if you have been cutting back your Agapanthus plant every year, and not seeing any flowers then this is the reason for it.

Cutting The Leaves Off Too Early

Agapanthus plants tend to grow a lot of leaves, especially if they have plenty of nitrogen in the soil. A lot of people tend to cut these leaves back as the plant tends to have a wide spread. By doing this you will not allow the plant to harvest as much energy as it needs in order to flower. Even if you cut back the leaves after it has flowered you can still do some damage to the plant which might not flower the next year.

Due To Too Much Nitrogen In The Soil

All plants need nitrogen in order to survive and thrive, the problem is that too much nitrogen will have some undesirable effects when it comes to Agapanthus plants. If you over-fertilize with too much nitrogen then the Agapanthus plant will focus all of its energy on growing leaves, and oftentimes they will simply skip flowering that year. So if your Agapanthus is only growing leaves for a couple of seasons already without flowering then cut back with the fertilizers. Too much nitrogen can cause plants to get leggy, for more information check out my recent article Why Plants Get Leggy? ( Top 4 Reasons ).

Not Enough Sunlight

Agapanthus plants grow best under full sun conditions, however, there are a couple of reasons why many people plant them in partial shade. In the southern parts of the country, the leaves can get burned if planted in a full sun location so many people plant it in partial shade. The problem with this approach is that it hinders the Agapanthus when it comes to flowering. If you have no other option than to grow it in partial shade then make sure that it gets morning sun, and not afternoon sun.

Sick Agapanthus Plants Will Not Flower

The Agapanthus plant is prone to several diseases like leaf spot, powdery mildew, gray mold, anthracnose, root, and bulb rot. In case the plant is sick it will not be able to flower as it will focus all of its energy on fighting off the disease. Some diseases can be spotted relatively easily like powdery mildew, leaf spot, and gray mold, but when it comes to root or bulb rot once you noticed there is a problem it might be already too late.


One of the main causes of not flowering for most plants is too much water, while some plants can handle it but the Agapanthus is really prone to root and bulb rot. The Agapanthus doesn’t need any special watering schedule, just water it like you do your other plants. Keep in mind that this plant is native to South Africa and it can withstand short periods of drought but it will really struggle if it is constantly in water.

Due to Clay Soil

Most soils have a percentage of clay in them, which is actually good as clay soil holds a lot of minerals and nutrients which are vital for the development of plants. However, if you have hard clay, compacted or cracked clay soil then your agapanthus will not flower, and in worst-case situations, it will simply wilt away. In this case, you should amend the soil with a simple potting mix or compost, just make sure that the roots can actually penetrate the soil.

Agapanthus In Pots Not Flowering

The Agapanthus plant can be grown in pots, however, it is not ideal. There are several reasons why the Agapanthus will not flower in some pots, like the material of the pot and the size of the pot. Agapanthus plants need a relatively large pot in order for their roots to develop healthily, if the roots can not develop then they will simply not be able to flower. Plastic or metal pots, on the other hand, will simply cook the roots of the plant, in most cases, it will simply not grow but in some cases, the plant will simply wilt away.

Key Takeaways

  • The most common reason why your Agapanthus is not flowering is due to frost damage, Agapanthus is hardy in Zones 8-10 and cold winters can cause frost damage to the plant. In addition to this if you are over fertilizing the plant will focus on growing leaves rather than on flowering. The Agapanthus plant produces flower buds in the autumn, so make sure not to cut these down as they will not flower the next year.
  • Too much fertilizer can stop the Agapanthus from flowering as it will focus on growing leaves.
  • Agapanthus plants are prone to several diseases, especially root and bulb rot, in this case, the plant simply can not flower.