Iris Bearded Immortality
Iris germanica 'Immortality'
A breakthrough reblooming bearded iris that produces pristine white flowers in both late spring and again in fall, extending the iris season dramatically. The pure white standards and falls are accented with a bright yellow beard, creating a classic and elegant display. This reliable rebloomer has won numerous awards and is considered one of the best white iris varieties for consistent performance.
Harvest
N/Ad
Days to harvest
Sun
Full sun
Zones
5–9
USDA hardiness
Height
18-30 inches
Planting Timeline
Showing dates for Iris Bearded Immortality in USDA Zone 7
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Iris Bearded Immortality · Zones 5–9
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | April – May | June – July | June – August | — |
| Zone 4 | March – April | June – June | June – July | — |
| Zone 5 | March – April | May – June | May – July | — |
| Zone 6 | March – April | May – June | May – July | — |
| Zone 7 | February – March | April – May | April – June | — |
| Zone 8 | February – March | April – May | April – June | — |
| Zone 9 | January – February | March – April | March – May | — |
| Zone 10 | January – January | February – March | February – April | — |
Complete Growing Guide
Soil pH: Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Water: EYE-riss. Height: 1 ft. 6 in. - 2 ft. 6 in.. Spread: 1 ft. 0 in. - 2 ft. 0 in.. Spacing: Less than 12 inches, 12 inches-3 feet. Maintenance: Medium. Propagation: Division. Regions: Coastal, Mountains, Piedmont.
Harvesting
The fruits is a brown capsule and measures 2 inches long and 1 inch wide.
Color: Brown/Copper. Type: Capsule. Length: 1-3 inches. Width: < 1 inch.
Harvest time: Fall
Bloom time: Spring, Summer
Storage & Preservation
Fresh-cut iris stems last 5-7 days in arrangements when properly conditioned. Recut stems under running water and place in clean vases with fresh water plus flower food. Change water every 2-3 days and trim stems slightly each time. For preserving the flowers, iris petals can be dried using silica gel for craft projects—bury flowers completely in silica gel for 3-4 days until papery. Seeds can be stored in paper envelopes in a cool, dry location for 2-3 years, though germination rates decline over time. Rhizomes can be stored short-term (2-3 weeks) in a cool, dry, well-ventilated area if you need to delay planting after dividing.
History & Origin
Origin: North temperate America, Europe, Asia
Advantages
- +Disease resistance: Deer, Rabbits
Considerations
- -Toxic (Roots, Sap/Juice, Seeds): Low severity
- -Causes contact dermatitis
Companion Plants
Plant Together
Lavender
Repels pests like aphids and thrips, both prefer similar well-draining soil conditions
Allium
Natural pest deterrent against iris borers and aphids, blooms complement iris timing
Catmint
Deters aphids and ants, provides ground cover without competing for nutrients
Salvia
Attracts beneficial insects, similar sun and drainage requirements
Ornamental Grasses
Provides structural support and wind protection, complementary root systems
Sedum
Excellent drainage companion, helps prevent root rot in iris rhizomes
Peonies
Similar care requirements, sequential blooming extends garden interest
Daylilies
Complementary bloom times, both thrive in similar growing conditions
Keep Apart
Black Walnut
Produces juglone toxin that inhibits iris growth and can cause yellowing and death
Mint
Aggressive spreader that competes for space and nutrients, can overwhelm iris rhizomes
Hostas
Requires more moisture and shade, creates overly humid conditions promoting iris soft rot
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #169270)
Pests & Disease Resistance
Resistance
Good resistance to iris borer, moderate soft rot resistance
Common Pests
Iris borer, thrips, aphids, slugs
Diseases
Soft rot, leaf spot, crown rot in poorly drained soil