How to Grow Bee's Knees Iris
Bee's Knees Iris
Iris germanica 'Bee's Knees'
flowerBee's Knees is a stunning tall bearded iris cultivar featuring vibrant yellow standards (upper petals) with deep purple-blue falls (lower petals), creating a striking bicolor display. This award-winning variety is prized for its large, ruffled blooms and reliable performance in most garden climates. It typically reaches 28-32 inches in height and flowers in mid-spring.
When should you plant Bee's Knees Iris in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Bee's Knees Iris timeline · Pittsburgh, PA (Zone 6b)
-
Plant Bee's Knees Iris
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
First Bee's Knees Iris blooms
Mid-to-late summerBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Bee's Knees Iris dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; performs best in zones 4-8 with cool to moderate summers
Sign up free to see if Bee's Knees Iris grows in your zone — and get a personalized planting timeline.
Get my Bee's Knees Iris timeline →Growth Stages
Dormancy/Planting
Variable; typically August-October for fall plantingIris rhizomes are bare or partially dormant; roots are minimal or absent at purchase
Plant in fall (August-October) or early spring (February-March). Handle rhizomes carefully to avoid damage. Position with growing end uphill on mounded soil.
Establishment
6-10 weeks from plantingNew growth emerges from rhizome; fan of sword-like green leaves develops; roots establish
Water gently to settle soil. Avoid overwatering. Monitor for rhizome rot. Ensure good drainage. Mulch lightly around (not over) rhizome.
Vegetative Growth
Late fall through early spring; ongoing during growing seasonTall, upright blue-green foliage grows vigorously; multiple fans emerge from mature rhizomes; plant builds blooming-size clumps
No fertilizer needed; iris prefer lean conditions. Remove dead or diseased leaves. Space fans as clumps expand. Water moderately during dry spells.
Flowering
Late April to May; 2-3 weeks of bloom per plantTall sturdy stems (28-32 inches) produce large, ruffled bicolor blooms: golden-yellow standards with deep purple-blue velvety falls; one to three flowers per stem
Do not fertilize during bloom or foliage may be damaged. Stake tall stems in windy locations. Remove spent flowers daily. Flowers last 2-3 weeks on stem.
Post-Bloom/Dormancy
May through August; dormancy deepens in late summerFlower stems fade and wither; foliage continues to photosynthesize; rhizome stores energy. Foliage remains green through summer in cooler zones; may yellow in heat
Remove spent flower stems below first leaf. Keep foliage intact until late summer; do NOT cut back early. Water moderately. Prepare for summer dormancy. Divide overcrowded rhizomes in late summer (mid-July to August).
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Remove and destroy affected rhizomes in summer/fall; inject BT (Bacillus thuringiensis) into base of stems in spring when growth reaches 4-6 inches; keep area weed-free
-
and
Hand-pick, use copper barriers, encourage beneficial predators (ground beetles), apply iron phosphate baits if needed
-
Spray with strong water stream, use insecticidal soap, encourage ladybugs and lacewings
-
Increase humidity, spray with water, apply miticide if severe (especially in hot, dry conditions)
Uses
Orris root flavoring
CulinaryIris rhizomes (particularly Iris germanica var. florentina, a close relative) have been used historically to flavor beverages and confections with a violet-like taste. Bee's Knees iris rhizomes may be similarly used, though this cultivar is primarily ornamental. [source]
Cut flower arrangements
HouseholdThe large, ruffled bicolor blooms of Bee's Knees are excellent for fresh bouquets and floral design. The tall stems and striking color combination make them a focal flower in spring arrangements. [source]
Traditional iris remedies
MedicinalIris rhizomes have been used in herbal medicine traditions for respiratory and digestive support, though Bee's Knees is grown primarily as an ornamental. Historical use includes poultice and infusion preparations. [source]
Pollinator attraction
WildlifeThe large, nectar-rich blooms attract bees, butterflies, and other pollinators to the garden. The tall inflorescences provide excellent landing platforms for beneficial insects. [source]
Dye source
CraftIris petals and rhizomes contain pigments historically used for dye-making. Deep purple-blue falls of Bee's Knees may yield indigo and purple hues for natural dyeing projects. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flowers for arrangements when the first bloom is fully open and others are showing color; recut stems at an angle and remove lower leaves. Flowers last 5-7 days in a vase. For best garden display, deadhead spent blooms to redirect energy to rhizome growth rather than seed production. Cut flower stems (not leaves) after blooming ends.
Fun Facts
- 🌱 The name 'Iris' comes from the Greek goddess of the rainbow, referring to the wide range of iris flower colors; bearded iris like Bee's Knees have a distinctive fuzzy 'beard' or crest on the falls that attracts bees as a landing guide.
- 🌱 Bee's Knees won the Dykes Medal in 1999, the highest honor for bearded iris varieties given by the American Iris Society, recognizing it as an outstanding cultivar in that year.
- 🌱 Tall bearded iris are the most popular iris class among gardeners and breeders, with hundreds of registered cultivars; Bee's Knees remains a top-rated choice decades after introduction due to its reliable performance, disease resistance, and striking color combination.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Bee's Knees Iris planting timeline
Tell us your zip code and we'll calculate exactly when to start Bee's Knees Iris seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Bee's Knees Iris timeline →