Summary of Plants Blooming on the Santa Rosa Plateau Vs. Time

This page contains observations from 7 January 2001 to 23 May 2001.


January observations: January 7, Vernal Pool Trail, Punta Mesa Trail, Monument Road, Trans Preserve Trail.

Plants in bloom:

The bloom is just about as sparse as it ever gets, awaiting the winter rains to begin the cycle again.


February 14-26 observations: Vernal Pool Trail, Ranch Road, Lomas Trail, Los Santos Trail, Adobe Loop Trail, Monument Road, Trans Preserve Trail, Clinton Keith Road.

Plants in bloom:

The bloom is picking up a bit, with several new species beginning to bloom every week, but is still quite sparse. There are 14 species in the beginning phase, with only a relatively few plants beginning to bloom. For comparison, there were 47 species in full bloom in mid-April last year.


March 1-11 observations: Vernal Pool Trail, Ranch Road, Lomas Trail, Los Santos Trail, Coyote Trail, Hidden Valley Road, Monument Road, Trans Preserve Trail, Granite Loop Trail, Clinton Keith Road.

Plants in bloom:

The bloom is picking up a bit, with several new species beginning to bloom every week, but is still quite sparse. There are 14 species in the beginning phase, many with only a relatively few plants beginning to bloom, and 9 species in full bloom. For comparison, there were 47 species in full bloom in mid-April last year.


March 13-18 observations: 13, 16, 18 March on Vernal Pool Trail, Ranch Road, Monument Road, Punta Mesa Trail, Trans Preserve Trail, Multiuse Trail, Waterline Road.

Plants in bloom:

The current bloom is improving rapidly. New species are blooming every few days, and the first fields of flowers are present (yellow blennosperma near the Pool and shooting stars at the beginning of the Punta Mesa Trail). There are currently 20 species just beginning to bloom and 13 species in full bloom, compared to 47 species in full bloom in mid-April last year. Peak bloom may occur in mid-April, the same time as last year, everywhere except at the Main Pool, and late-May at the Main Pool.


20 March - 4 April observations: 20, 23, 27, 30 March and 4 April on Vernal Pool Trail, Ranch Road, Waterline Road, Vista Grande Trail, Faultline Road, Multiuse Trail, Trans Preserve Trail, Los Santos Trail.

Plants in bloom:

The current bloom is very close to its peak overall, with many showy species at their peak. In most places, it is difficult to look around and not find patches of color due to showy flowers. The grasslands have johnny-jump-ups, California buttercups and blue dicks sprinkled lavishly throughout.

Best displays:

There are currently 24 species beginning to bloom and another 24 species in full bloom, compared to 47 species in full bloom in mid-April last year. Peak bloom may occur in mid-April, the same time as last year, everywhere except at the Main Pool, and late-May at the Main Pool.

List of Plants in Bloom:


4-14 April Observations: 4, 8, 11 and 14 April on Vernal Pool Trail, Ranch Road, Waterline Road, Vista Grande Trail, Faultline Road, Monument Hill Road, Multiuse Trail, Trans Preserve Trail, Los Santos Trail, Punta Mesa Trail, Coyote Trail, Tenaja Road, Hidden Valley Road.

Plants in bloom:

The current bloom is now at its peak overall, with many showy species at their peak. In most places, it is difficult to look around and not find patches of color due to showy flowers. The grasslands have johnny-jump-ups, California buttercups and blue dicks sprinkled lavishly throughout.

Best displays:

There are currently 35 species not yet at full bloom, another 30 species in full bloom, and 6 species ending their bloom. Peak bloom is probably now, about the same time as last year, everywhere except at the Main Pool. Peak bloom at the Main Pool may occur in early June.

List of Plants in Bloom:


17-26 April observations: 17, 20, 23 and 26 April on Vernal Pool, Los Santos, Trans Preserve, Vista Grande and Granite Loop Trails; Faultline, Monument Hill, Hidden Valley, Tenaja and Waterline Roads.

Plants in bloom:

The current bloom is now at its peak overall, despite some showy species being past their peak. In most places, it is difficult to look around and not find patches of color due to showy flowers. The grasslands have blue-eyed grass, California buttercups and blue dicks sprinkled lavishly throughout, with a few fields of California poppies.

Best displays:

There are currently 39 species not yet at full bloom, another 41 species in full bloom, 15 species ending their bloom, and 5 species that are finished blooming. After a lull in early April, we are now back to having nearly two new species bloom every day! Peak bloom is probably now, about the same time as last year, everywhere except at the Main Pool. Peak bloom at the Main Pool may occur in mid-June, depending on when it dries up.

List of Plants in Bloom (names with question marks following are probable identifications that haven't been confirmed yet):


28 April - 10 May observations: 28 April; 2, 6 and 10 May on Vernal Pool, Los Santos, Multiuse, Trans Preserve, Coyote and Adobe Loop Trails.

Plants in bloom:

The current bloom is now well past its peak overall, with annual grasses obscuring many of the flowers in most of the Reserve. The best displays are over, but there are still new beautiful species coming into bloom every few days.

Best displays:

New species beginning bloom recently (dates are when I first observed them):

There are currently 11 species not yet at full bloom, another 48 species in full bloom, 35 species ending their bloom, and 22 species that are finished blooming. The overall bloom is well past its peak everywhere except at the Main Pool. Peak bloom at the Main Pool may occur in mid-June.

Small popcorn flowers cover nearly all of the vernal pool, with the lovely blue downingia beginning to bloom along most of the boardwalk. Threadleaved brodiaea is in full bloom near the pool.

List of Plants in Bloom:

10-23 May observations: 10, 14, 18 and 23 May on Vernal Pool, Los Santos, Multiuse, Trans Preserve, Coyote, Punta Mesa, Lomas, Granite Loop and Adobe Loop Trails; Faultline, Waterline and Tenaja Roads.

Plants in bloom:

The current bloom is now well past its peak overall, with annual grasses obscuring many of the flowers in most of the Reserve. The best displays are over, but there are still new beautiful species coming into bloom every few days, and almost 100 different species of flowers in bloom.

Best displays:

New species beginning bloom recently (dates are when I first observed them):

There are currently 23 species not yet at full bloom, another 26 species in full bloom, 37 species ending their bloom, and 53 species that are finished blooming. The overall bloom is well past its peak everywhere except at the Main Pool, which is now at its peak.

Small popcorn flowers cover nearly all of the vernal pool, with the lovely blue downingia producing patches of color and a pleasant smell along the boardwalk. Threadleaved brodiaea is ending its bloom near the pool.

List of Plants in Bloom:


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Updated 27 January 2003.