Light Needs
Mature Height
Mature Spread
Growing Zones
Cape Cod Boys Siberian Iris, or Iris sibirica 'Cape Cod Boys' is a beachy, perennial Iris with upright, sky-blue flowers with fluid midnight blue veins and sunny yellow signals. This beardless ocean beauty grows in clumps of thin, vivid green, knife-point leaves that produce slender stems from 27 to 32 inches tall, each holding 2 to 5 blossoms that bloom in early summer and rebloom well into early fall. It is a vigorous plant that spreads from 18 to 24 inches.
Native to Europe and Asia, this award-winning Siberian Iris is a low-maintenance, colorful option for any budding gardener. It is deciduous in winter and attracts hummingbirds. One of its greatest appeals is its resistance to common diseases that plague other varieties of Iris.
Cape Cod Boys Siberian Iris Care
The Cape Cod Boys Siberian Iris prefers full sun, but can tolerate partial sun in hot areas. In order to thrive, it needs moist, well-drained soil that is slightly acidic. In a naturalized setting, they can be planted in areas with very moist to wet soil.
In colder areas, The Cape Cod Boys Siberian Iris should be planted in early spring to late summer. In milder areas, it is better to plant in the fall. This variety should be water liberally after planting until it is well-established. In the fall, prune away dead foliage.
Cape Cod Boys Siberian Iris Spacing
The Cape Cod Boys Siberian Iris should be spaced 1 to 2 feet apart. They are an excellent choice for rain gardens or around ponds, lakes, pools and stream sides. This variety is not affected by juglone, so they can be grown under Black Walnut Trees. Siberian Irises bloom before Japanese irises, but after tall bearded varieties.
Cape Cod Boys 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
- Slow
- Growth Habit
- , Clumping, Upright
- Water Needs
- Average
Flowers & Foliage
- Flower Colors
- , Blue, Yellow
- Flower Description
- Blue and white
- Bloom Time
- Late Spring to Early Summer
- Foliage Color
- , Green
- Foliage Description
- Green
- Foliage Type
- , Herbaceous
- Seasonal Interest
- , Summer Flowering
Garden Benefits
Plant Overview
- Common Name
- Cape Cod Boys Siberian Iris
- Botanical Name
- IRIS SIBIRICA 'CAPE COD BOYS'
- 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!