Jepson Prairie Wildflower Hike

Limnanthes douglasii ssp rosea

The Jepson Prairie Preserve in Solano County is a great place to see a number of rare plants, in a special environment. This is more of a “stroll” than a “hike”, but it is well worth visiting. The reserve protects one of the few remaining vernal pool habitats in California. If you have the chance to visit in mid to late Spring you will see some amazing sights.

This year we visited it in mid March of a wet year, so we were ahead of the major bloom. We did find some wonderful flowers (and animals), but this year the best bloom will be later.

Limnanthes douglasii ssp rosea

Meadowfoam

Note: Click on any photograph to see a larger image

The Hike

As I said, it isn’t much of a hike. If you go there on your own, there is an open area that you can wander through, immediately adjacent to the parking lot. It is entirely flat, but fairly wet. Bring galoshes or a change of shoes.

What you are looking at is a collection of temporary or “vernal” pools. The largest is Olcott Lake, which starts off at around 93 acres. They are formed by rain water that has been trapped by an impermeable layer of soil. As the weather warms up a wonderful variety of flowers appear, including 15 rare and endangered species (over 400 of plants that have been found in the Reserve).

Vernal pool at Jepson Prairie

Olcott Lake, Jepson Prairie

As the pools start to dry out and shrink you will find brilliant bands of flowers ringing them. In full bloom it is quite impressive. The most common flowers are massive swaths of Goldfields, Meadowfoam and Yellow Carpet.

I strongly recommend taking one of the docent-led tours the first time that you visit. These are free, and generally are held every Saturday from mid March through late May. See the Solano Land Trust web site for details on the tours. They usually start at 10:00 AM and run for two hours.

From a vernal pool at Jepson Prairie

Tadpole shrimp

The docents can take you into areas that are normally off limits, and they’ll show you things that you won’t normally see on your own. The vernal pools are the home to a number of different kinds of shrimp and insects (more shots in the gallery at the end of this article), and they’ll be able to catch some to show to you. The pictures I have here aren’t that clear – keep in mind that these are animals that are (for the most part) just a fraction of an inch in size, and some of my shots were taken through the sides of a glass container (hand held, on a windy day).

Blennosperma nanum var nanum

Yellow Carpet

Timing is Everything

It is hard to identify what the best time is for visiting. A lot depends on the amount of rain each year. If you come early (like we did this year) you won’t see the wide rings of flowers around the pools. However, there are some flowers that you will only see early in the season. In a dry year the pools shrink fast.

If you have only one chance, I would try mid April, before it gets too hot. Keep in mind that it is almost always windy here, and that most of the flowers are very short so you’ll be getting down on your hands and knees in moist ground if you want to get a good look.

Directions

The Jepson Prairie Reserve is south of Dixon, California. From Interstate 80 take Highway 113 south. You will travel about 10 miles until Highway 113 takes a 90 degree turn to the east. At this point, instead of taking that turn, continue straight onto Cook Lane. Continue over the creek and railroad tracks until you see the eucalyptus grove and interpretive sign. These signs will show you the area where you can enter the Reserve. Tread carefully!

See the Solano Land Trust web site for details on the tours.

The Flowers

Please feel free to correct any identification errors I may make. Click on any photograph to see a larger image. All pictures were taken with a Nikon D50 with a Nikkor AF-S Micro 60 mm closeup lens. It was fairly windy but bright, and all of the shots were hand held (my tripod doesn’t work well with really short flowers).

The highlight of this trip was the Prairie Bells, which is a rare and endangered species.

Fritillaria liliacea

Prairie Bells

Fremont’s Goldfields is one of the flowers that will carpet the area once the weather warms up a bit.

Lasthenia fremontii

Fremont’s Goldfields

Here is a shot of a start of the bloom, with a mixture of Goldfields, Yellow Carpet and some Meadowfoam.

Goldfields and Yellow Carpet

Jepson Prairie

Padre’s Shooting Star were just starting to show, and they were a little beat up from the wind. These are much lighter colored than the shooting stars I’m used to from the Sierra’s.

Dodecatheon clevelandii ssp patulum

Padre’s Shooting Star

California Golden Violet is very similar to the violets you will find in your local nursery.

Viola pedunculata

California Golden Violet

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