Photo by Melody

PlantFiles: Daylily
Hemerocallis '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; Year of Registration or Introduction: 1977

» View all varieties of Daylilies

3 vendors have this plant for sale.

30 members have or want this plant for trade.

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

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There are a total of 30 photos.
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7 positives
2 neutrals
1 negative

Gardeners' Notes:

Positive braun06 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.

Positive CalamityJeanne 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.

Neutral FrillyLily 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.

Positive Mainer 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.

Negative RobertWM 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.

Positive gregspam 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.

Positive LPG 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!

Positive cweiner106 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!

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

6" white blooms, 25" scapes

Positive clumboy 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.


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

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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