Location specific values:
Array
(
    [lat] => 40.110100
    [lng] => -111.640500
    [elevation] => 1424.3581
    [rainfall] => 482.6737
    [cold_temperature] => -8.8144
    [temperature] => 32.811
    [user_eto] => 1418.80296494
)

Plant specific values:
Array
(
    [rain_min_irrigation] => 800
    [eto_corrected] => 1247
    [eto_adjusted_rain_min (rain_min_irrigation / eto_corrected)] => 0.6415397
)
Johnson’s Grass Tree (Xanthorrhoea johnsonii) | Easyscape Plant Profile

Johnson’s Grass Tree

(Xanthorrhoea johnsonii)

Johnson’s Grass Tree (Xanthorrhoea johnsonii)

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Estimated Native Range
Species Map Help

Climate Requirements for Spanish Fork, Utah

This Plant Your Site Plant Suitability for Your Location
• Precipitation 31" - 59" 19" Your precipitation may be insufficient for this plant. Irrigate N" / year. Irrigate N" / year
• High Temp. 79°F - 89°F 91°F Your summer temperatures are normal for this plant. Excellent
• Low Temp. 36°F - 51°F 16°F Your winter temperatures may be too cold for this plant Too cold
This plant should grow well at your location with about N inches per year (Y minutes per month) of irrigation.

Summary

Xanthorrhoea johnsonii, commonly known as Johnson’s Grass Tree, is a perennial plant native to the sclerophyll forests and heathlands of eastern Australia. It is a slow-growing species that can reach up to 16 feet (5 meters) in height, with a thick, woody trunk and a tuft of long, narrow leaves that can persist for many years. The foliage is often used in floral arrangements due to its durability and unique appearance. Johnson’s Grass Tree produces a tall flower spike that can reach several meters in height, covered in small white to cream flowers that are attractive to a variety of pollinators.

This plant is highly valued for its drought tolerance, fire resistance, and low maintenance requirements, making it a popular choice for xeriscaping and native plant gardens. It thrives in well-drained, sandy soils and requires little to no supplemental watering once established. Full sun is ideal for optimal growth. In cultivation, it is often used as a focal point in landscapes due to its striking form and texture. While generally disease-free, it can occasionally suffer from root rot if planted in poorly drained soils.CC BY-SA 4.0

Plant Description

  • Plant Type: Shrub, Tree
  • Height: 6-15 feet
  • Width: 2-3 feet
  • Growth Rate: Slow
  • Flower Color: White
  • Flowering Season: Spring
  • Leaf Retention: Evergreen

Growth Requirements

  • Sun: Full Sun
  • Water: Low
  • Drainage: Fast

Common Uses

Bird Garden, Drought Tolerant, Fire Resistant, Low Maintenance, Rock Garden, Showy Flowers

Natural Habitat

Native to sclerophyll forests and heathlands of eastern Australia

Other Names

Common Names: Forest Grass Tree

Scientific Names: Xanthorrhoea johnsonii

GBIF Accepted Name: Xanthorrhoea johnsonii