Erosion control is a critical aspect of landscape management, particularly in areas prone to soil degradation and instability. The strategic use of plants can play an invaluable role in not only beautifying the environment but also in fortifying the soil against erosion. By selecting appropriate plant species, such as those with extensive fibrous root systems, one can significantly enhance soil stability and prevent erosion. In this article, we delve into the best plants for erosion control, drawing on extensive research to guide your choices for effective soil management.

Ozbreed has conducted research on erosion control focusing on identifying the best plants to strengthen soil and prevent erosion of the upper layers of the soil, which are often the most critical when controlling erosion. The study, led by Todd Layt and Ian Paananen since 2007, has tested various plant varieties, focusing on strappy leaf plants like Lomandra, Dianella, Dietes, and Agapanthus, as well as native Australian grasses such as Pennisetum. Results showed that these plants, due to their extensive root systems, significantly increase soil shear strength compared to uncovered soil.

https://www.ozbreed.com.au/best-plants-for-erosion-control/

Lomandra longifolia ‘KATRINUS DELUXE’ PVR

‘Katrinus Deluxe’ is a compact and robust variety of Lomandra longifolia, featuring a uniform growth habit with dense foliage and an abundance of large, stunning yellow flower clusters. It thrives in a variety of soil types, ranging from sandy to clay soils, and is well-suited for both mass and specimen planting. ‘Katrinus Deluxe’ is also highly tolerant of frost and drought conditions, making it a versatile choice for many landscapes.

Size and Planting Density:

This Lomandra variety typically grows to a height of 70 cm and a width of 70 cm. For optimal coverage, it is recommended to plant ‘Katrinus Deluxe’ at a density of 2-6 plants per square metre or 1.5-2 plants per linear metre.

Erosion Control Efficiency:

366% stronger than bare soil.

’Katrinus Deluxe’ holding the soil down on this slope, no worries. https://ozbreed.co.nz/plant-ranges/strappy-leaf-plants/katrinus-deluxe-lomandra/

Tasred™ Dianella tasmanica ‘TR20’ PVR

This plant can thrive in a range of conditions, from drought to frost and heavy shade to full sun. It exhibits striking colour contrasts, with foliage that can change from green to reddish tones, particularly in colder climates. It produces attractive wide leaves and large purple berries during the spring and summer months. This variety is often chosen as an excellent alternative to Phormium due to its similar visual impact and robustness.

Size and Planting Density:

Tasred Dianella typically reaches a height of 45 cm and spreads 40-50 cm wide. For effective coverage and optimal soil stabilisation, it is recommended to plant it at a density of 4-6 plants per square metre or 2-4 plants per linear metre.

Erosion Control Efficiency:

250% stronger than bare soil.

Tasred™ Dianella looking great in a bed that has space for more specimens to be planted. https://ozbreed.co.nz/plant-ranges/strappy-leaf-plants/tasred-dianella/

Nyalla™ Lomandra longifolia ‘LM400’ PVR

Nyalla™ Lomandra is an improved, semi-compact variety of the popular species Lomandra longifolia. This plant is distinguished by its fine blue-grey foliage and upright growth habit, which is 20% larger than the Tanika™ Lomandra. From September to October, Nyalla™ Lomandra produces small, vibrant yellow flower heads, adding aesthetic value to its functional benefits. It is particularly well-suited for coastal landscapes, thriving in conditions with salt-laden winds and requiring minimal maintenance once established.

Size and Planting Density:

Nyalla™ Lomandra typically grows to a height and width of 80-90 cm. For effective erosion control and coverage, it is recommended to plant Nyalla™ at a density of 2-5 plants per square metre or 1-2 plants per linear metre.

Erosion Control Efficiency:

328% stronger compared with bare soil.

Nyalla™ Lomandra thriving in poor roadside soils en masse. https://ozbreed.co.nz/plant-ranges/strappy-leaf-plants/nyalla-lomandra/

Breeze™ Dianella caerulea ‘DCNC0’ PVR

Breeze™ Dianella caerulea is a superior, no-cane variety of Dianella caerulea. Unlike the common variety, it does not develop messy straw-like canes that tend to fall over, remaining tidy and visually appealing. Breeze™ Dianella tolerates humidity, cold, and moderate drought. It is versatile enough to be planted in various soil types, provided they are not very poor.

Size and Planting Density:

This variety typically reaches a height and width of 60-70 cm. For optimal coverage and erosion control, it is recommended to plant Breeze™ Dianella at a density of 4-6 plants per square metre or 2-3 plants per linear metre.

Erosion Control Efficiency:

297% stronger compared with bare soil.

https://ozbreed.co.nz/plant-ranges/strappy-leaf-plants/breeze-dianella/

Conclusion

In conclusion, the selection of the right plants is paramount in combating soil erosion and ensuring the long-term stability of the landscape. The research undertaken by Todd Layt and Ian Paananen underscores the effectiveness of strappy plants like Lomandra and Dianella, which excel in fortifying soil and preventing erosion through their robust root systems.