Light Needs
Mature Height
Mature Spread
Growing Zones
The striking white blooms of the Butter & Sugar Siberian Iris will brighten up a bed or border from June through July. The Iris sibirica features crisp white upright and drooping petals with yellow falls. Each stalk produces several delicate flowers. Green, narrow, sword-shaped foliage grows around the base of the plant and stays in place for the remainder of the growing season after the blooms fade.
Feature these dainty flowers in beds, borders, or mass plantings. Butterflies are drawn to the blooms, but the plant is deer resistant. The Butter & Sugar Siberian Iris is a clump-forming plant that is low maintenance and drought-tolerant, although it will do best with consistent moisture. Grow this Iris as a perennial in USDA zones 3 through 8.
Butter & Sugar Siberian Iris Care
The Butter & Sugar Siberian Iris requires full sun to partial shade. The right spot will have at least 4 to 6 hours of sunlight. Use sandy or loamy soil that is acidic to neutral and moist but well-drained. Water weekly or when the top couple of inches of soil dry out.
Feed the plant using balanced fertilizer in the early spring. Spent flowers can be removed, but leave the foliage in place to continue to add greenery throughout the growing season. Divide the plant during midsummer or early fall.
Butter & Sugar Siberian Iris Spacing
This upright, clump-forming plant will grow 28 inches tall and 24 to 30 inches wide. Plant the Butter & Sugar Siberian Iris as close as 22 to 28 inches apart to create a full bed or continuous planting.
Butter & Sugar Siberian Iris Plant Facts
Growing Conditions
- Hardiness ZonesGrowing Zones
- USDA Zones 3 to 8 (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
- Full Sun (6+ Hours Direct Sun)
- Mature Height
- 2 Feet
- Mature Spread
- 2 Feet
- Growth Rate
- Moderate
- Growth Habit
- , Clumping, Upright
- Water Needs
- Consistently Moist
Flowers & Foliage
- Flower Colors
- , White, Yellow, Multi Colored
- Flower Description
- Creamy White, Butter Yellow
- Bloom Time
- Late Spring
- Foliage Color
- , Green
- Foliage Description
- Green
- Foliage Type
- , Herbaceous
- Seasonal Interest
- , Summer Flowering, 3 Season Interest, Spring Flowering
Garden Benefits
Plant Overview
- Common Name
- Butter & Sugar Siberian Iris
- Botanical Name
- IRIS SIBIRICA 'BUTTER & SUGAR'
- Plant Type
- Perennial
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!