Daylily 'Joan Senior'


Family: Hemerocallidaceae (hem-er-oh-kal-id-AY-see-ee) (Info)
Genus: Hemerocallis (hem-er-oh-KAL-iss) (Info)
Cultivar: Joan Senior
Hybridized by Durio
Registered or introduced: 1977
» View all varieties of Daylilies


24-36 in. (60-90 cm)


18-24 in. (45-60 cm)


USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:

Full Sun

Sun to Partial Shade

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

By dividing the rootball

Bloom Time:

Early midseason (EM)

Reblooming (Re)

Flower Size:

Large (more than 4.5" diameter)

Blooming Habit:

Diurnal (diu.)

Extended (ext.)

Flower Type:


Bloom Color:

White/Near White

Color Patterns:


Flower Fragrance:

No fragrance

Foliage Habit:

Evergreen (ev.)



Awards (if applicable):

Lenington All-American Award (or runner-up)

Award of Merit (or runner-up)

Honorable Mention

Junior Citation

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Unknown - Tell us

Where to Grow:

Unknown - Tell us


This plant has been said to grow in the following regions:

, (2 reports)

Dothan, Alabama

San Jose, California

Yorba Linda, California

Denver, Colorado

Waterbury, Connecticut

Bartow, Florida

Miccosukee Cpo, Florida

Richmond Hill, Georgia

Tucker, Georgia

Eastport, Idaho

Galva, Illinois

Hazel Crest, Illinois

Jacksonville, Illinois

Oak Park, Illinois

Peoria, Illinois

Elkhart, Indiana

Solsberry, Indiana

South Bend, Indiana

Cedar Rapids, Iowa

Nichols, Iowa

Ewing, Kentucky

Hebron, Kentucky

Salvisa, Kentucky

Durham, Maine

South China, Maine

Adamstown, Maryland

Clawson, Michigan

Dearborn Heights, Michigan

Gladwin, Michigan

Royal Oak, Michigan

Duluth, Minnesota

Excelsior, Minnesota

Waynesboro, Mississippi

Brunswick, Missouri

Lebanon, Missouri

Auburn, New Hampshire

Endicott, New York

Southold, New York

Waterville, New York

Chapel Hill, North Carolina

Oxford, North Carolina

Raleigh, North Carolina

Ravenna, Ohio

Rockbridge, Ohio

Uniontown, Ohio

Hulbert, Oklahoma

Renfrew, Pennsylvania

Columbia, South Carolina

Conway, South Carolina

North Augusta, South Carolina

Simpsonville, South Carolina

Hixson, Tennessee

Gilmer, Texas

Houston, Texas

Richmond, Texas

Linden, Virginia

Richmond, Virginia

Stuarts Draft, Virginia

Green Bay, Wisconsin

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Gardeners' Notes:


On Jun 21, 2010, braun06 from Peoria Heights, IL (Zone 5b) wrote:

I like white flowers but like them in daylilies. This one is still nice. The flowers dont hold up to rain well as on other daylily cultivars.


On Sep 10, 2009, CalamityJeanne from Duluth, MN wrote:

I planted Joan Senior in spring 2008. She didn't do much that first year--I think I got a total of three blooms--but she took hold, overwintered nicely, and bloomed profusely this year. This was a strange summer, weatherwise. It was very cool and many perennials bloomed very late, while others were right on schedule. Three days after Labor Day 2009 Joan Senior still has two or three buds.


On Jan 28, 2009, FrillyLily from springfield area, MO (Zone 5b) wrote:

I gave this a neutral because the blooms do not get quite as big for me as listed. It is a very heavy bloomer for me. There are now many more whites to chose from and JS is not that ruffled or remarkable compared to some of the others now available. The plant increases fast for me.


On Jan 23, 2009, Mainer from Durham, ME (Zone 3a) wrote:

Joan Senior was a very slow starter in my garden but now it is looking like it should. Hardy enough to stay in my wooden raised beds and blooms at the same time as my red Sphinx lilium so the white will be lovely with those double red lilium.


On Oct 14, 2006, RobertWM from Clawson, MI wrote:

Aparently it needs growing conditions which the south side if my house never provided. It grew rather slowly for me and always flowered but never profusely. Bud count was quite low for a modern daylily and the flower size never reached the reported six inches, three and a half to four was the norm. I bought it from Oakes so I'm reasonably certain I had the correct variety but I babied it for three years and then replaced it with something which should be more productive.


On Jul 16, 2003, gregspam from Dothan, AL wrote:

"joan senior" has done great in my garden, it is a terrific rebloomer and i dont think there could be a better white one in my garden.


On Jul 16, 2003, LPG from Chapel Hill, NC wrote:

Long bloom period. Very nice white blooms on very strong stems! Happy to learn that she is evergreen and a rebloomer. I highly recommend this daylily!


On Jul 2, 2003, cweiner106 from Oxford, NC wrote:

I stuck this one in very heavy clay soil, in a very crowded bed, tucked under a butterfly bush. Geez, is it ever a beautiful surprise when one walks around the bend and discovers it! It's creamy off-white blooms are stunning!


On Jan 23, 2003, mystic from Ewing, KY (Zone 6a) wrote:

6" white blooms, 25" scapes


On Sep 24, 2002, clumboy wrote:

too bad there isn't a choice for "very positive". lots of daylilies are pretty and good in the garden, but this one really stood out for lots of reasons. each double fan put up a single, sturdy scape, one scape had a large proliferation on it. fbo was 7/4 and the total bloom period was 35 days. the blooms are a beautiful light ivory with a hint of pink, sometimes recurved, sometimes not. it set pods like a fiend, and the pods were huge. it doesn't hold up well when watered, but it doesn't completely disintegrate like some, either. the literature says that it is very vulnerable to insect damage, however this year in my garden i didn't notice anything along those lines. popular for many years, and for good reason.