Plant of the Month (January) : California Wild Tarragon

California wild tarragon (Artemisia dracunculus): spring foliage

January
begins with the hope of long-needed rain.
We’ve been watering since late November, so some perennial plants are leafing
out, despite the lack of rain. One of
these, the California wild tarragon (Artemisia
dracunculus), is producing plenty of bright green foliage in our Garden of
Health. The scientific name for this
species is pronounced : are-teh-MEE-see-uh drah-KUNK-yu-lus.

California
tarragon is a member of the Sunflower family (Asteraceae). It belongs to the same genus as the more familiar
California sagebrush (Artemisia
californica) and Mugwort (Artemisia
douglasiana). For more on these
other two Artemisias see: http://mother-natures-backyard.blogspot.com/2013/11/plant-of-month-november-california.html
and http://mother-natures-backyard.blogspot.com/2017/12/plant-of-month-december-california.html.

Artemisia dracunculus is native to western North America,
from Alaska to northern Mexico. It can
be found throughout much of California; locally, it still grows on Catalina
Island, and in the Santa Monica, Verdugo and San Gabriel Mountains and their
drainages. A plant requiring good spring
moisture, it grows in many plant communities, from coastal
sage scrub to coniferous forest, at elevations up to 11,000 ft. (3300 m.).

It
once was common in seasonally wet areas of the Los Angeles Basin, including
along Ballona Creek and likely other places.
This is not the showiest of natives, so it was probably not routinely
collected. This, unfortunately, was the
fate of many a plain, common native plant in the early days. Overlooked – but not unimportant.

California wild tarragon (Artemisia dracunculus): plant in spring

California
tarragon is a part-woody sub-shrub, growing 2-5 ft. (0.5-1.5 m.) tall and 3-5
ft. wide. It consists of multiple upright
stems that increase in number as the plant matures. The grayish tan stems are fairly stiff and
woody except at their tips, and are often sparsely branched. Some feel that
Wild tarragon has a weedy appearance – but that’s in the eye of the beholder. We tend to like the open, lacy appearance of
the foliage, particularly in spring and early summer.

California wild tarragon (Artemisia dracunculus): leaves

The
leaves of Wild tarragon are narrow – sometimes almost linear – and occasionally
toothed. The foliage may be aromatic on
a warm day, and is certainly so when crushed.
The foliage is most often smooth (without hairs) and leaf color ranges
from bright green (emergent) to darker or gray-green in the dry season. The foliage is drought-deciduous, but plants
can be kept green with occasional summer water.

California wild tarragon (Artemisia dracunculus): spring foliage

Like
our other local Artemisias,
California tarragon is a warm season bloomer – often from July or August into
September or October in Western L.A. County. The flowers are typical for the
Artemisias: small, green-gold flower heads along the tips of the upright
stalks. The flowers are wind-pollinated, so they don’t need to be showy. We’ll get some pictures of the flowers next
summer. Until then, see some excellent
photos on Cal photos: https://calphotos.berkeley.edu/cgi/img_query?rel-taxon=begins+with&where-taxon=Artemisia+dracunculus.

Artemisia dracunculus is fairly easy to grow, tolerating
even local alkali soils. Most garden experts recommend full sun. But in warmer, inland local gardens it will
probably do better with some afternoon shade. In the wilds, Wild tarragon often
grows on well-drained sandy or alluvial soils; too much summer water can lead
to root rot.

California wild tarragon (Artemisia dracunculus): young plant

That
being said, our plant in the Garden of Health, growing in compacted clay loam,
has done well for the past four years.
We are a bit more cautious of summer irrigation, soaking monthly from June
to August. Plants in well drained sandy
or rocky soils – or in containers – can safely be watered more frequently. Plants really do look better with judicious summer water. Just let the soil dry out well between
waterings.

While
this plant can be invasive in moist soils, this is unlikely to be an issue in a
water-wise S. California garden. It
spreads via rhizomes, but has increased only minimally in size in the four
years in our garden. Just don’t
over-water (or contain it in a pot).

California wild tarragon (Artemisia dracunculus): plant in fall

Like
a number of our local native sub-shrubs, Artemisia
dracunculus can be short-lived (5-10 years) in the garden. We don’t have long-term, personal experience
with this plant. We do prune our plant back severely each fall (after foliage dies), in
an effort to rejuvenate it and prolong its life (see below). In the wilds,
plants are routinely browsed by deer, elk, bighorn sheep and others; they actually
need to be pruned. Plants grown in
containers also benefit from dividing every 2-3 years. But we won’t be
surprised if we need to replace our plant occasionally.

California wild tarragon (Artemisia dracunculus): after pruning

We’re
not entirely sure why some local sub-shrubs have a limited garden lifespan. Some limitation is likely due to the ‘not
quite natural’ conditions of garden life.
But we suspect that a shorter lifespan is also due to properties inherent
in the plants themselves. These species are
associated with mediterranean climate landscapes - landscapes that mature and
are replaced more rapidly than those of moister climates. We shouldn’t be surprised that these shrubs
are adapted to cycles measured in decades, rather than centuries.

California wild tarragon (Artemisia dracunculus): dried herb

You
likely guessed that Wild tarragon has medicinal and culinary uses. Tarragon has a flavor difficult to describe: spicy,
warm and somewhat sweet. If you reach
for the tarragon in your spice cupboard, consider growing a fresh, native
source in your garden. Fresh tarragon
leaves can be used in salads or as a flavoring for herb butters, vinegars,
sauces, pickles, salad dressings, soups and stews. The leaves can be rubbed on
meat or fish before roasting or grilling.

The
flavor of wild tarragon is quite adaptable, and can be used in surprising ways:
to flavor beverages, in liqueurs and even in baked goods. Young, tender shoots
can be cooked and used as wild greens or as a potherb. The seeds – collected in fall – can be
parched and eaten or used as a flavoring agent.
Leaves can be dried for later use, but should be used within 6 months or
so (they lose their characteristic flavor with age). To
inspire you, we’ll post some recipes using Wild tarragon later this month (http://mother-natures-backyard.blogspot.com/2018/01/california-gourmet-wild-tarragon.html).

California wild tarragon (Artemisia dracunculus): on right

Wild
tarragon has a long history of medicinal use. It has a reputation for soothing
indigestion, particularly when used with fatty meats. An infusion of the leaves has been variously
used to treat fevers, intestinal worms and indigestion. It is also a mild
sedative and can be used as a sleep aid.

Tarragon
has also been used to stimulate menstruation and should not be used by pregnant
women. Traditional medicine favors
a poultice of the foliage to heal cuts, treat toothache and ease arthritic pain.
The root was also used for toothache and menstrual problems. The plant has also been employed - fresh, dry
or burned - to repel insects (like mosquitos, bedbugs and others), and as a breath
freshener or perfume.

Recent
studies have confirmed the medicinal properties of Tarragon extracts. They are active against a wide range of human
and animal bacteria. There is also some
evidence for anti-fungal activity. As
always, herbal medicines should be used
with caution, and only after consulting with a qualified medical practitioner. For more on the medicinal use of Wild
tarragon, see references 1-3, below.

California wild tarragon (Artemisia dracunculus):

Mother Nature's Garden of Health

If
you want to include Wild tarragon in your garden, first consider its size. It will
get to 4-5 ft. wide, so give it the space it needs. Of course, Artemisia dracunculus is right at home in a medicinal or herb
garden, particularly one that features Mediterranean herbs like thyme and
rosemary. It also is perfectly happy in a large container – very much a
Mediterranean look.

California wild tarragon (Artemisia dracunculus):

in container

But
consider also using it in a mixed native bed, with California sagebrush,
California brickelbush, the bush monkeyflowers and wild grasses. It would also be very happy on the edges of a
rain garden or infiltration swale. It will love getting a little extra
winter/spring water. Just remember that
it gets a little raggedly looking by fall.

We
hope you’ll be inspired to include Artemisia
dracunculus in your own garden. It’s
a wonderful example of a highly useful native plant. And it gives an authentic, water-wise, California
touch that simply can’t be duplicated by a non-native shrub.

For a
gardening information sheet see: http://www.slideshare.net/cvadheim/artemisia-dracunculus

For more
pictures of this plant see: http://www.slideshare.net/cvadheim/artemisia-dracunculus-web-show

For plant
information sheets on other native plants see: http://nativeplantscsudh.blogspot.com/p/gallery-of-native-plants_17.html