Updated: October 11, 2022

Dianella is a genus of around 40 species of flowering plants native to Australia, New Zealand, and tropical Asia. These plants are known for their attractive foliage and flowers. Dianellas are commonly grown as ornamental plants in gardens and landscapes.

One of the most common questions asked by gardeners when it comes to Dianella is how tall they can grow. In this article, we will explore the various factors that determine the height of Dianella plants and answer some frequently asked questions about them.

Factors That Determine the Height of Dianella Plants

Several factors affect the growth of Dianella plants. Some of these factors include:


There are many species of Dianella plants, and each has its own growth rate and ultimate height. For example, the Dianella caerulea can grow up to 1 meter tall, while the Dianella revoluta can reach up to 1.5 meters in height.

Soil Quality

The quality of soil in which you plant your Dianella will also affect its growth. These plants prefer well-draining soil with a pH between 6.0 and 7.5. If the soil is too compacted or too wet, it can hinder the growth of your Dianella.


Dianellas require regular watering, especially during dry periods. However, overwatering can lead to root rot and stunted growth.


Dianellas prefer full sun to partial shade exposure. Plants grown in full sun tend to be shorter than those grown in partial shade.

How Tall Do Dianella Plants Grow?

The height of Dianella plants varies depending on the species and growing conditions. As mentioned earlier, some species like the Dianella revoluta can grow up to 1.5 meters tall while others like the Dianella caerulea can grow up to 1 meter tall.

In general, most Dianella species grow to a height of between 60 cm and 1.5 meters. The height of your Dianella will depend on the species, soil quality, watering, and sunlight exposure.

Frequently Asked Questions

How often should I water my Dianella?

Dianellas require regular watering, especially during dry periods. Water your Dianella once or twice a week, depending on the weather conditions.

Can I grow Dianella in a container?

Yes, you can grow Dianella in a container. Ensure that the container is large enough to accommodate the plant’s roots and that it has adequate drainage holes.

What pests and diseases affect Dianella plants?

Dianellas are relatively pest-free plants. However, they can be affected by fungal diseases like leaf spot and rust. Regularly inspect your plants for any signs of disease and treat them promptly if any are found.

How do I propagate my Dianella?

Dianellas can be propagated through division or seed propagation. To propagate through division, remove the plant from the ground and separate the clumps of roots using a sharp knife or garden shears. Replant the divisions in well-draining soil.

To propagate through seeds, collect the seeds from mature plants and sow them in well-draining soil. Keep the soil moist until the seeds germinate.


Dianellas are attractive plants that add color and texture to any garden or landscape. The height of your Dianella plant will depend on various factors such as species, soil quality, watering, and sunlight exposure. With proper care and maintenance, your Dianella plant can thrive and reach its full potential.