Sustainable Living: Managing Annual Wildflowers

 

Arroyo lupine (Lupinus succulentis) - Mother Nature's Backyard

 

Annual
wildflowers are among the most popular California native plants.  An important part of our natural heritage, they
add unique colors and interest to the spring/summer garden.  We covered the basics of annual wildflower gardening
in a previous posting:  http://mother-natures-backyard.blogspot.com/2013/01/growing-california-wildflowers.html   Here we consider the sustainability side of
growing annual wildflowers.

You
may be puzzled about the idea of ‘managing’ wildflowers.  They are,
after all, ‘wildflowers’; can’t they can
simply manage themselves?  And indeed
they can – in the wild.  But local gardens differ in important ways
from wild lands.  In the case of annual
wildflowers, several gardening choices play a key role in wildflower sustainability.

Removing spent annual wildflowers after seeds are gone

 

Late
spring visitors are often surprised to see golden wildflower stalks among the
blooming shrubs in Mother Nature’s Backyard. 
One rarely sees drying flower stalks in public gardens; they are often
removed as quickly as possible, to preserve the beauty of the garden.  The practice of ‘immediate removal’ of spent flowers
does improve the appearance of a
garden – but at a cost.  Understanding both
the costs and benefits can help you make the right decisions for your own
garden.

Our
annual wildflowers are remarkably efficient organisms.  They germinate, flower and set seeds in only
a few months, allowing them to succeed in our mediterranean climate.  Local annuals survive the long dry season as
seeds; so their continued survival is entirely dependent on the formation of healthy,
viable seeds.  Without seeds, the
wildflowers will disappear from the garden.

The
last stage of seed development is the ‘desiccation’ stage, during which seeds
lose up to 95% of their water.  This extreme
drying allows the embryo to enter a state of suspended animation; there it
remains, unharmed by hot, dry weather, through the summer and fall.   When
the winter rains begin, the seed and embryo quickly re-hydrate, allowing the
embryo to begin growing and thence to germinate.

Seed pods - Arroyo lupine (Lupinus succulentis)

It’s
often impossible to tell whether seeds have matured to the desiccation state
before they enter it.  If collected too
early, seeds may not yet be ready; even if allowed to dry, they may not be
viable.   The safest strategy is to allow seeds to dry
naturally on the plants. They can then be collected (important for seeds that
are heavily eaten by birds) or allowed to naturalize in the garden.   

And
that’s why visitors to our garden see drying flower stalks this time of year. They
are very noticeable (see above).  But what’s
nearly invisible is the process of seed desiccation - taking place in every
pod, capsule and flower head.   A true miracle of life, though sometimes not a
tidy one!

Annual wildflower stems used as mulch

In
Mother Nature’s Backyard we emphasize life-friendly gardening.  We do several things to support the continued
survival of annual wildflowers in the garden.

1. We allow seeds to desiccate on
   the plants.




2. We collect some seeds for
   storage, sharing or propagation. We collect more of the seeds that can be
   over-eaten by birds (Elegant clarkia [Clarkia
   unguiculata], Tidytips [Layia
   platyglossa] and the Goldfields [Lasthena
   species] come to mind).  The remaining
   seeds are allowed to self-sow (naturalize) in bare areas of the garden.




3. When dead plants are finally
   removed, they are used as mulch, further spreading the remaining seeds and
   providing summer mulch.  Because
   ours is a public garden, we try to make our mulch as inconspicuous as
   possible.




4. Some areas of the garden are left
   covered with only a thin organic or inorganic (gravel) mulch.  The mulch helps protect seeds from
   over-predation by  birds.   And the thin mulch allows them to
   successfully germinate.

These
time-honored practices have been followed by Native Californians and sustainable
gardeners for thousands of years.  They
mimic the ways of Mother Nature, providing food for animals and humans, while
helping sustain the plant species.   They
are life-friendly and sustainable.

So
when our tidy-up instincts tempt us to remove plants, we remind ourselves of the
benefits of waiting, just a bit, for seeds to complete their cycles. We look
forward to next year’s wildflowers with hope and expectation.  We hope you’ll consider doing the same in at
least a few areas of your own garden.

 

We
welcome your comments (below).  You can
also send your questions to: mothernaturesbackyard10@gmail.com

 

 

 

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Plant of the Month (April) : Tomcat clover – Trifolium willdenowii

Tomcat clover (Trifolium willdenowii) in Mother Nature's Garden of Health

‘A
cute little wildflower, delicate in appearance’ - this description fits many of
our native annual wildflowers.  But this
month’s ‘Plant of the Month’ comes with a surprise; it’s actually a clover! 
This cute little wildflower is blooming right now in Mother Nature’s
Garden of Health.  For more on the garden
see: http://mother-natures-backyard.blogspot.com/2014/03/our-new-garden-mother-natures-garden-of.html

Tomcat
clover is one of over fifty species and sub-species/varieties of clover native
to California.  Most grow in regions far moister
than western Los Angeles County; but at least 10 species are native to the
area, including those from the Southern Channel Islands (San Clemente and Santa
Catalina Islands).  

Tomcat
clover (Trifolium willdenowii) is
widely distributed from British Columbia, Canada, to South America.  It can be found throughout much of the
California Floristic Province (west of the Sierra Nevada Range).  Locally it still grows in the foothills of
the Santa Monica and San Gabriel mountains; early records also place it in coastal
Los Angeles County, in areas that are now entirely developed.

Clovers
are members of the legume/pea family (the Fabaceae or Leguminosae).  In
addition to containing important food plants, the legume family is known for its
relationship with nitrogen-fixing bacteria. 
Certain soil bacteria (the nitrogen-fixers) form nodules within the
roots of many legumes.  The modified
bacteria obtain their food from the plants; this ‘food’ provides the energy
needed to convert gaseous nitrogen to nitrogen forms that can be used by plants. 

Farmers
often use clovers as a fallow crop.  By
planting clovers on ‘resting’ fields, then allowing the roots to break down in
the soil, farmers improve the soil’s nitrogen supplies.  This easy, natural method of fertilizing
soils has been practiced for a long time. 
Native clovers can be used in a similar way in vegetable gardens.

 

Tomcat clover (Trifolium willdenowii) - foliage

 

Tomcat
clover is a small annual or short-lived perennial in our area.  Growing 1-2 feet tall and about as wide, the
plant has the delicate herbaceous stems we associate with clovers.   The
leaves, while composed of three leaflets (as expected for a clover) look less
like the common ‘shamrock’ than one might expect.  As seen above, the leaflets are narrow – sometimes
almost linear – giving the plants a delicate, open appearance.  Plants have a deep taproot, making them more
drought tolerant than some wildflowers. 
In winter-warm areas they may spread via their roots, sometimes forming
large colonies in the wild.



Tomcat clover (Trifolium willdenowii) - flowering plant



 Tomcat
clover blooms in spring, anytime from March to May in western Los Angeles County.   The tiny flowers grow in ball-shaped
clusters typical of clovers.  The flowers
range in color from pink to purple; the colors are more intense in sunnier
locations.  From a distance the flowers
are delicate, old-fashioned and decidedly pink-purple.  But if you haven’t looked closely at a clover flower
you might want to do so – they’re more interesting than you might imagine! 

 

Tomcat clover (Trifolium willdenowii) - close-up of flowers

 

As
seen above, the petals are fused into a tube that’s lavender or purple and may
have darker veins.  The lobes (wings) of
the tube resemble the ‘banner’ and ‘keel’ of other peas (for example, Sweet
peas or Lupines) though less clearly defined. 
The upper (‘banner’) lobes are shades of purple/violet while the lower (‘keel’
lobes) are usually white tipped with a blotch of darker purple/magenta.   All
but one of the yellow-colored stamens (pollen producing organs) are fused.   In sum,
the flowers are very decorative and attractive.

Tomcat
clover is not too particular in its growth requirements.  It likes a well-drained soil, but does fine
in many clay soils; it’s also slightly tolerant of salty soils. While it grows
in both full sun and part-shade, we’ve found it does best in areas with some
afternoon shade in our area (during its winter/spring growth period). Like all
annual wildflowers, it needs moist soils until it flowers.

Tomcat clover (Trifolium willdenowii) - young seedlings

Tomcat
clover is a typical annual wildflower. 
It germinates or starts to grow in wet winter/spring soils.   The photo above shows that seedlings look
much more ‘clover-like’ than do the mature plants.  In fact, most clovers look quite similar as
young seedlings; so you have to wait for the distinctive mature leaves to
develop before deciding whether it’s a desired native clover or invasive alien.   Trifolium willdenowii flowers in warm
spring weather, then sets seed and dies back with the heat and drought of late
spring.   Begin to withhold water as plants start to
flower, then taper off to none as the seeds develop.  You can collect and store the dry seed – or let
the plants drop their seed and naturalize.

Tomcat clover (Trifolium willdenowii) in the garden

 

There
are many good reasons to include Tomcat clover in the garden.  As noted above, all clovers improve soil
nitrogen (leave the roots in the soil when you cut off the dead stems).  They also attract native insect pollinators
and seed-eating birds.  But the California
clovers have even more to offer.  Native
Californian recipes utilize young plants for raw or cooked greens.  In the past, plants/leaves were also dried
for later use in soups, stews, baked goods and other dishes. 

The
seeds are also delicious – raw or parched. 
They can be ground and used as a thickening agent in soups, stews and sauces;
they can also be used in baked goods.   The flowers of native clovers can be used for
making tea or in baking.   The tea was used to treat gastrointestinal disorders
and joint aches; steam from boiling flowers was formerly inhaled to clear head
colds.

 

In
summary, Trifolium willdenowii is
both a charming and useful plant for the home garden.  It can be tucked into small areas, or grown
between shrubs.  It makes a good cover
crop in the vegetable garden or orchard. 
It even makes an enchanting little container plant.  We hope you’ll want to add some native clover
to your garden.  

For
a gardening information sheet see: http://www.slideshare.net/cvadheim/gardening-sheet-trifolium-willdenowii

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

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

_____________________________ 

We
welcome your comments (below).  You can
also send your questions to: mothernaturesbackyard10@gmail.com

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