Observed Bloom Period for Brodiaea

Detailed Past Records of Bloom Times

I kept detailed records for the year 2001 for the entire Santa Rosa Plateau, and for the years 2002 and 2003 (through 6/8/03) just for the Vernal Pool Trail. The following table gives the start and end of blooming, as well as the start and end of peak bloom. Peak Bloom is defined as when the maximum number of flowers were open in a given year. The beginning and end times below are when 1% of the maximum number of flowers were open. Typically, the very first flower and the very last flower appear only a week before or after the 1% dates.

All full bloom dates are from observations, thus it is possible that the peak bloom began a few days earlier and ended a few days later than the dates reported below. The dates for 1% bloom are sometimes interpolated.

Brodiaea terrestris ssp. kernensis

Estimate from memory, not data recorded at the time: at peak bloom in a normal year on the Vernal Pool Trail, there are about 200 flowers open; 1% of that number is 2 flowers open. In the severe drought year of 2002, peak bloom was 6 flowers.

Begin 1% bloomBegin Peak BloomEnd Peak BloomEnd 1% bloom
5/10/20015/18/20015/23/20016/10/2001
5/10/20025/27/20025/27/20026/5/2002
5/15/20036/08/2003????

Less detailed information is available from the following years. The 1997 data come from the records of Gordon House.

YearTrailBloom dates
2005Vernal PoolFull bloom on 5/26/05
1997Vernal PoolAt least some days in March (???; this seems surprising, if true!)

Brodiaea filifolia

Estimate from memory, not data recorded at the time: at peak bloom in a normal year on the Vernal Pool Trail, there are about 50 flowers open; ~1% of that number is 1 flower open. In the severe drought year of 2002, peak bloom was ~6 flowers.

Begin 1% bloomBegin Peak BloomEnd Peak BloomEnd 1% bloom
4/20/20015/10/20015/14/20015/27/2001
4/12/20024/17/20025/05/20025/27/2002
4/06/20034/30/20035/15/20036/08/2003

Less detailed information is available from the following year.

YearTrailBloom dates
2005Vernal PoolFull? bloom on 5/26/05


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Copyright © 2006 by Tom Chester.
Permission is freely granted to reproduce any or all of this page as long as credit is given to me at this source:
http://tchester.org/srp/plants/blooms/species/brodiaea.html
Comments and feedback: Tom Chester
Updated 30 March 2006.