Light Needs
Mature Height
Mature Spread
Growing Zones
Striking foliage, delicate blooms, and small berries ensure the Coolvista™ Dianella provides visual interest throughout the growing season. This plant is also known as Dianella revoluta ‘Allyn-Citation,’ blueberry lily, blue flax-lily, or black-anther flax-lily. This clump-forming ornamental grass features thin, flat blue-gray foliage that tapers to a point. Deep blue to purple inflorescences hover above the blades of grass in the spring and summer and later transition to blue-colored berries that last for several months.
Once established, this plant is very hardy and can comfortably live in various conditions. The upright, spiky foliage adds color and texture to borders, mass plantings, and containers. This easy-care plant is heat and drought tolerant, ensuring it can handle the summer heat and still look amazing. The Coolvista™ Dianella lives as a perennial in USDA zones 8 through 11.
Coolvista™ Dianella Plant Care
This plant requires full sun to part shade, and 4 to 6 hours of sunlight is enough to sustain growth. Established plants will need water during an extended drought, and newly planted plants will need water when the top few inches of the soil dry out. The soil should be well-draining and mildly acidic or neutral. Feed the plant by placing several inches of organic compost around the base during the spring or apply a slow-release fertilizer. Remove spent blooms and any damaged growth.
This plant is a perennial in warmer areas, but cover the plant if the forecast calls for chilly weather. The greenery will die back if the plant is exposed to cold weather, and if this happens, trim back the dead growth, and new foliage should appear in the spring.
Coolvista™ Dianella Plant Spacing
This spikey grass grows 1 to 2 feet tall and just as wide. Coolvista™ Dianella can be planted as close as 8 to 12 inches apart to create a continuous planting of lush foliage. Space the plants 2 feet apart for individual plantings.
Coolvista™ Dianella Plant Facts
Growing Conditions
- Hardiness ZonesGrowing Zones
- USDA Zones 8 to 11 (perennial); grown as an annual elsewhere (outdoors year-round); grown indoors elsewhere (outdoors year-round); grown in containers elsewhere (grown as a seasonal crop)
- Sun Exposure
- Part Shade to Full Sun (3+ Hours Direct Sun)
- Mature Height
- 1-2 Feet
- Mature Spread
- 1-2 Feet
- Growth Rate
- Moderate
- Growth Habit
- , Upright
- Water Needs
- Average
Flowers & Foliage
- Flower Colors
- Flower Description
- Blue
- Foliage Color
- , Green
- Foliage Description
- Green
- Foliage Type
- , Evergreen
- Seasonal Interest
- , 4 Season Interest
Garden Benefits
Plant Overview
- Common Name
- Coolvista™ Dianella
- Botanical Name
- Dianella revoluta 'Allyn-Citation' PP22965
- Plant Type
- Ornamental Grass
Simple Plant Spacing Calculator
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons
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We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.
Starting January 1, 2026 all bushes, perennials & trees purchased come with an extended 1-year warranty for added confidence. If your plant dies due to a health issue within a year, we’ll make it right.
Plants that are currently in stock typically ship within 2-7 business days after your order is placed.
Plant Addicts ships to the lower 48 states within the U.S. Unfortunately, we do not currently ship to Alaska, Hawaii, or internationally.
This plant cannot be shipped to the following states: AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations. Other plants may still be available for shipping to these states.
If you have any questions about shipping restrictions, feel free to reach out to our team!