The Largest Dahlia in the World with Rules

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 2018 winners are announced!

PlaceGrower(s)Dahlia NameSize
1stIris WallaceMaki14 7/8"
1stKen GreenwayAC Younge14 7/8"
2ndBob PattersonEmory Paul14"
3rdJohn and Johanna MortonPennhill Dark Monarch13 1/4"

2018 Largest Dahlia in the World Winner – Maki
Grown by Iris Wallace
Photo by Deborah Dietz

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