Per year the daylilies are hereinafter classified into 4 groups consisting of the combinations of diploid/tetraploid and standard/special.
As non-standard i.e. special daylily cultivars are classified all those daylilies in here, that meet one of the following criterias:
- double flowering,
- spiders (i.e. thin petals with a width to length ratio of 1:4 or more),
- UFs (i.e. unusual forms),
- polytepals, i.e. flowers have more than 6 tepals (without being double, and/or without filaments or style reverted back to tepals)
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