More about Daylily seasons of bloom
- Climate Zone 5 extends across America from Connecticut through parts
of Pennsylvania, Ohio, Kansas, and westward. South of this
(Zones 6-10), bloom is earlier.
To the north (Zones 2-4), bloom
- "Bloom" means one or more open flowers on five percent or more
of the plants of that variety here at the farm.
- To be included in a Bloom Season, a variety must be in bloom for
two-thirds (20 days) or more of the 30-day period.
- Extending the period of bloom, and "rebloom", have NOT been encouraged in
the growing field where these bloom records are taken.
(Attention to any of the following can often prolong the period of bloom.)
- No irrigation or supplemental watering has been given beyond natural rainfall.
- No fertilization has been given beyond the initial application of
composted sheep manure 15-18 months, or 27-30 months, previously.
- No removal of developing seed pods has been done.
- Records are restricted to a single planting location per variety. (Plantings in different
locations here at the farm may vary in bloom period by several days.)
- No record is made of the flowering dates during the initial year of planting (3-6 months).
- No record is made of plantings over 3 years in age (39 months or more since planting).
Such records would be valuable, but we have so very few plantings of this age that they
would not make a comparable body of information.
- Records for several years are averaged together.
- During each of the past 5-10 years there has been a slight tendency
for bloom to occur earlier by one to several days. As this trend
continues, a variety tends to appear in an earlier bloom season
and to disappear from a later one.
For example, the variety Princess Irene
was designated during the 1970s and early 1980s as "Late
Midseason" to "Extra Late", but it now blooms "Midseason" to "Extra Late". Similarly,
Neyron Rose bloomed in "Early Midseason" in 1990, but by 2010 its season had advanced to
Here at Bloomingfields Farm, we believe this to be a local
manifestation of Global Warming.