Why is Agapanthus Not Flowering? (Causes & Solutions)

Agapanthus needs full sun and frequent watering to bloom well.

Lack of watering or too much shade will also stunt flowering.

Once established, this plant is drought tolerant, but water it frequently, especially if it’s in a pot.

It also needs a well-drained container, and overwatering can lead to root rot or fungal diseases.

Agapanthus not flowering

Agapanthus flowering problems

Agapanthus are not commonly troubled by diseases, but they are susceptible to several common pests and diseases, including fungi.

The best way to prevent fungal issues is to provide proper drainage and avoid overwatering.

When the soil becomes too wet, the roots lose oxygen, and they become more susceptible to rot.

Symptoms of root rot include stunted growth and eventual drop of the plant.

These pests can be treated with appropriate care, and fungicides can be applied in time to control the outbreaks.

Another common problem with Agapanthus flowering is drought. It is very sensitive to drought conditions, so it is important to keep it moist after flowering.

This will encourage new flower buds to form, but it can also be a problem if the plant does not receive adequate winter protection.

The yellowing of Agapanthus leaves is often a sign of a fungal infection. This condition causes the plant to turn yellow and droop, and in severe cases, the leaves will fall off.

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The plant may also be infested with mealybugs and spider mites. To prevent these pests, use a fungicide every week. Follow the instructions on the label to ensure proper coverage.

In addition to problems with agapanthus flowering, thrips can also plague the plant. These tiny needle-thin insects feed on plant juices and can attack the flower petals, leaves, and stems.

They also carry many diseases, so preventing their infestation is essential.

Thrips can be controlled by laying sheets of aluminum foil in the flowerbed. Afterward, it is important to remove the affected plants from the pot and soil.

What is the best fertilizer for agapanthus?

Many farmers and gardeners recommend using a water-soluble fertilizer for agapanthus.

This type of fertilizer is specially formulated to provide optimal nutrition and control pests and diseases like black spots and powdered mildew.

It is best applied as a top dressing to the soil. Applying 1.5 to 2g per liter of compost in pots or 100g per m2 of soil is recommended for best results.

Fertilizing agapanthus is essential to ensure the blooming process is successful.

Once the plant has grown, agapanthus should be fertilized twice a year. The fertilizer should be a combination of phosphorus and low nitrogen.

Adding nitrogen to your agapanthus’ soil is not a good idea, as this can lead to problems with blooming.

Agapanthus prefers soil that drains well. This soil can include sand, perlite, or pumice stone.

Compost is a rich source of nutrients and should be used as a soil supplement. An ideal mix is composed of 60% compost and 40% sand.

Fertilizing agapanthus is easy, but you should remember to follow the directions on the fertilizer package. Fertilize the plant once a year in the spring and once again in midsummer.

The best fertilizer for agapanthus is an organic liquid formula or granular fertilizer.

Water the fertilizer thoroughly before applying it to the plant’s leaves. Remember that undiluted fertilizers could burn the roots.

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How to Make Agapanthus to Flower

Unless you want to take the whole plant apart, the best way to grow agapanthus is to plant it from seed. These plants grow well in pots and like to have roots bound together.

They will thrive in a container with tight soil, and you can leave them there for a long time.

Then, when the season is right, you can move them outside to a garden or transplant them into a larger container. It’s best to plant agapanthus in the fall or early spring.

When growing agapanthus, make sure you give them enough sunlight. When you grow them in containers, they will need more water than plants grown in the ground. However, you should not give them too much water.

In the ground, one deep watering a week should be enough. However, if you grow them in a container, you need to water them two or three times a week.

The plant is best planted in a 24″ pot. This is the right size for display, as it won’t overcrowd or overly affect the plant.

After the flowers have flowered, divide the plant and re-pot it with new John Innes No 3 compost. If the plant is left outdoors, it may be affected by overwintering, so make sure to bring it indoors before the frost hits.

Another great way to display agapanthus is to plant it in a tall vase. This flower is a favorite of florists because of its long-lasting bloom.

However, be aware that agapanthus sap is toxic, so you must be very careful when handling it.

It is also best to put the flowers in a bucket full of water to rest before arranging them. After this, place the flowers in a tall vase and cut them at slightly different heights.

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How Long Does Agapanthus Flower?

Most agapanthus will flower during their first year in the landscape, though there are some that take up to four years to bloom.

Regardless of what type you choose, be sure to plant the plant in a sunny location with well-drained soil.

Agapanthus also tolerates drought, but you should avoid watering it regularly during the winter months.

Agapanthus is propagated from seed, which should be sown in spring. Once germination occurs, it will take about one to two months before the plant is ready to flower.

Once it has flowered, divide the plant into 2 or 3 separate plants, planting each one in a separate pot.

You can use a sharp knife to divide the plant, but be aware that the divisions may not flower until the following year.


Agapanthus grows well in containers. Plant the roots of each plant one inch deep and space them 12 inches apart.

They grow well in 6-inch pots but should be moved to a larger pot in the fall. Once they’re mature, they can be moved outdoors or potted indoors until spring.

Agapanthus can tolerate poor soil but prefers well-drained soil with a good balance of organic matter.

In heavy soils, consider amending with grit, which helps open up air pockets and improve drainage.

It is also tolerant of part shade, although the flowering will be compromised.

You should plant Agapanthus close to the soil level.

The soil should not be too compacted, as this can cause root congestion. The extra root space helps the plant grows leaves and flowers.

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