The Largest Dahlia in the World

The public LOVES big, humongous, monstrous dahlias.  So each year ADS sponsors the Largest Dahlia in the World contest.  We hope that each country/regional/local show will include this category in their schedules.  (See the contest rules below.)

The 2019 winners are announced!

PlaceGrower(s)Dahlia NameSize
1stMonterey Bay Dahlia, CaliforniaIris WallaceMaki14 7/8"
2ndMonterey Bay Dahlia, CaliforniaKen GreenwayAC Jeri14"
3rdDahlia Society of California, San FranciscoIris WallaceMaki13 3/8"
Honorable MentionHamilton and District Chrysanthemum and Dahlia SocietyJohn MoonayAggie White12 3/8"
Honorable MentionHeirloom Expo, Santa Rosa CaliforniaChad BakerHoly Cow12"
Honorable MentionDahlia Society of California, San FranciscoSamantha Barclay-SaxonPenhill Watermelon11 3/4"
Honorable MentionNanaimo Gladiolus and Dahlia SocietyCathy FeatherbyShow 'n Tell11"

2019 Winner – Iris Wallace – Maki

Contest Rules

  1. Bloom must be a named cultivar.
  2. Dahlia does NOT need leaves but must have stem and stand free in a show container.
  3. Dahlia can have blown center but not necessarily.
  4. Dahlia may come from an  AA or A section which has already been judged or entered directly into the Largest Dahlia Section.
  5.  Measurement is exclusively the largest diameter.  Depth has nothing to do with size in this contest.  Ideally, two senior judges do the measurement.  If pressed, a senior judge and a well accredited judge can judge.
  6. Dahlia must be measured in competition at a dahlia show sanctioned by that country’s official Dahlia Society i.e., ADS, NDS, NDSNZ, or DSA.
  7. Deborah Dietz with Creve Couer

    Deborah Dietz with Creve Couer

     Report the following information to Deborah Dietz:
              cultivar name
              judges’ names
              grower’s name and society
              show’s sponsor and location
    via email or US Mail. 

Get an Entry Form here.

You are not required to use the form if you’d rather just put the information into an email (  Second and third runners up are also welcomed to report.


 A snapshot of the judges measuring the winner or the grower with the dahlia would be most appreciated but is not mandatory.

Contact Deborah Dietz if you have questions.

Ken (founder of the contest) and Marilyn Masurat