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Ploidy
Tet: Tetraploid
Dip: Diploid

Ploidy refers to the number of chromosomes a daylily has. The normal number, or the diploid number, has 22 chromosomes where as a tetraploid daylily has 44, double the normal number of chromosomes. The distinction is primarily important to hybridizers, as they need to know ploidy when crossing - diploids can be crossed only with diploids, tetraploids only with tetraploids (although there are exceptions to this rule)..

Foliage Habit
EV: Evergreen - Foliage is green throughout the year, ie. daylily is a continuous grower
DOR: Dormant - Foliage dies back in winter
SEV: Semi-Evergreen - In between EV and DOR

Foliage is normally classified into the above 3 groups but there is much overlap between the groups. The American Hemerocallis Society further defines the types of foliage to: hard dormant, semi-dormant, semi-evergreen, evergreen, and soft evergreen. What is useful to know is the seasonal changes to foliage when purchasing daylilies. Evergreenness is often associated with frost-tenderness. A general rule of thumb to consider: dormants are hardy to Zone 3; semi-evergreens to Zones 4 and 5; evergreens to Zones 5 - 8. Dormants are your best bet in the prairies and for Zones 3 and 4. Of course there are MANY exceptions, and there are alot of hardy evergreens and tender dormants. I grow very many evergreens here in my zone 6 garden.

	Bloom Season		Size Data Scape height: Measured in inches Bloom size: Measured in inches Characteristics Re: Rebloom: Additional scapes come up from a fan that has already bloomed. Rebloom is less dependable in Canada where temperatures may be too low. Bud count becomes a more important factor in terms of blooming periods. Noc: Nocturnal - Flower opens in the late afternoon or early evening, closing sometime during the following day Ext: Extended Bloom - Flower opens and remains open for at least 16 hours Fr: Fragrant VFr: Very fragrant UFO or UF : Registered as an unusual form Dbl: Registered as a double Poly: Registered as a polytepal. Flower has more than the usual 3 petals, 3 sepals and six stamens Emo: Early morning opener
EE	Extra Early	First daylilies to bloom in early summer
E	Early	Daylilies that bloom 3-5 weeks prior to peak bloom season
EM	Early to Mid	Daylilies that bloom 1-3 weeks before peak bloom season
M	Mid	Daylilies that bloom at peak bloom time
ML	Mid to Late	Daylilies that bloom 1-3 weeks after peak bloom time
L	Late	Daylilies that bloom when most others have finished (4-6 weeks after peak)
VL	Very Late	Last daylilies to bloom, in autumn

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