BattenBlooms
PL. —Iris germanicaBotanical illustration — drop image
Iris germanica

Bearded Iris

SpringSummer
3a–9bHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
Not in bloom
Fall
Not in bloom
Peak bloom
In bloom
Background

Bearded iris are among the most dramatic spring flowers in the cutting garden — the falls, standards, and beard combining in elaborate color patterns that have attracted breeders for centuries. The range runs from white through yellow, apricot, pink, violet, blue, near-black, and bicolors. Plant rhizomes in late summer or early autumn with the top of the rhizome at or just above soil level — shallow planting is the single most common iris mistake.

Cut stems when the first bud on the spike is just opening; additional buds will open in sequence over several days in the vase. Remove spent blooms but leave the stem until the last bud has finished. Divide congested clumps every 3–4 years in late summer, discarding the old centre and replanting the healthy outer fans.

Good companions
Paeonia lactifloraNarcissus tazettadaylily
Care guide
SunFull sun — 6+ hours; needs sun on the rhizome
WaterLow to moderate once established; never let rhizomes sit in wet soil
SoilWell-draining, average fertility; the top of the rhizome should be exposed to sunlight
Spacing18–24 inches
Height2–3 feet
Zone3a – 9b
Frost hardy
Seasonal tasks
spring
cutCut when the first bud on the spike is just opening
watchCheck for iris borer damage — small sawdust-like frass at base of leaf fans
summer
sowPlant rhizomes in late summer/early autumn, top of rhizome exposed to sun
cutCut spent flower stalks to the base once blooming finishes; leave the leaf fans intact
cutDivide congested clumps every 3–4 years in late summer
Common problems

Botrytis (grey mould)

Symptoms

Grey fuzzy mould on petals and stems, worst in cool wet conditions.

Treatment

Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.