Pollinator Habitat: Does One Small Garden Matter?

Mother Nature's Backyard provides pollinator and bird habitat.

Summer is our peak insect season in
Southern California.  And 2017 is a
fantastic year for garden insects!  The
winter rains have helped a number of species – from butterflies to tiny flower
flies – bounce back.  We hope you’re
taking the time to enjoy them.

Habitat gardening is gaining
popularity throughout the world.  As
green space disappears, more gardeners are choosing plants for their habitat
value. In doing so, we take it on faith that if we plant the right plants, the insects and other creatures will come.
 But how much difference can one small
garden really make?  

That’s just the kind of question that
biologists like to ask – and try to answer. 
To that end, the UC Berkeley Bee Lab (http://www.helpabee.org/)
is monitoring bees in gardens throughout the state.  In S. California, they currently have sites
in Camarillo, La Canada/Flintridge, Palm Springs and Riverside. We look forward
to seeing the results of their monitoring efforts in these gardens.

Several species of native Buckwheats attract summer insects.

Unfortunately, the Berkeley Bee Lab has no sites yet in
western Los Angeles County.  That’s a
shame – there are many interesting pollinators in our local gardens.  Are the insects different from those of other
areas?  Are there (as yet) undiscovered
pollinator species in western L.A. County? 
What locally native plants are important for the specialist
pollinators?  What pollinator species can
a small, typical suburban garden support?   All of these are questions begging for
answers.

 

Jesus Cepeda, Cal Poly Pomona, examines trap.

And that’s why Mother Nature’s
Backyard is currently participating in a study designed to  answer some of those questions – at least for
the bees.  Jesus Cepeda, a Master’s
Degree Candidate at Cal Poly Pomona, is conducting a study of bee pollinators
in six native plant gardens in Los Angeles County.  Most are home gardens; but one is Mother
Nature’s Backyard.

Cepeda is a bee biologist.  He wants to know whether native plant gardens
attract the same types of native bees as are found in natural areas. He’s also interested
in questions of seasonality, floral density and floral species relationships.  And so, about every six weeks, he visits each
garden to see what’s flying.

 

Collection in Mother Nature's Backyard

Cepeda uses several collection
methods.  He utilizes pan traps (small
plastic bowls filled with soapy water) to collect the smaller species.  These are yellow, blue,
white and red; he leaves them in place for 24 to 48 hours.  He also uses a net to capture some of the
larger species.    He takes them back to
the lab, preserves them and determines what species they are.   His results will ultimately be analyzed and
published.

We eagerly await the results of
Cepeda’s study (we’ll update you when we know more).  Until then, we continue to observe and
photograph the insects in our gardens. 
Some photos are not so great, but others are detailed enough to classify
to the genus or even species level. 
We’ve also managed to document some interesting pollinator behavior in
our gardens.   All of this just makes us
more curious about the creatures with whom we share our gardens.









Cepeda surveys a sunny, July garden

So, does one small garden
matter?  The jury is still out, but the
hints are promising.  Bigger is better, certainly,
but even small gardens are likely to provide important habitat. We suspect that
interesting answers – specific to our area - will emerge in the next few years.
 The data will help us spread the news
about the importance of habitat gardening. 
Someday, entire local neighborhoods may provide crucial pollinator
habitat.  That’s an exciting thought!

In the meantime, you can help the
effort by photographing your garden insects and uploading them to iNaturalist (https://www.inaturalist.org/home).  It’s fun and easy – you may even learn the
names of the insects.  And you’ll be
doing something no one else can: documenting the insects in your garden for science and for posterity.

Want
to learn more about habitat gardening?  See:

We encourage your comments below.  
If you have questions about Duskywing butterflies or other gardening
topics you can e-mail us at :  mothernaturesbackyard10@gmail.com

 

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Mourning Cloak Butterfly – Nymphalis antiopa

Mourning Cloak butterfly (Nymphalis
antiopa): Mother Nature's Backyard

 

For the past two summers, the
numbers and species of butterflies in S. California gardens have been
abnormally low.  This year, with a wet
winter easing the drought, many butterflies have returned.  We were particularly worried about the
Mourning Cloak, a butterfly rarely sighted in our area in recent years.  We’re happy to report that the numbers of Nymphalis antiopa – in Preserves as
well as gardens – are up again this summer in California.   The scientific name is pronounced nim-FAL-is  an-tee-OH-puh.

Growing
up in S. California in the 1950’s and ‘60’s, Mourning Cloaks were a very common
sight.  We searched for the more ‘exotic’
butterflies in our wanderings; Mourning Cloaks were hardly worth the effort.  Adulthood (and loss of butterfly habitat and
numbers) have brought a new appreciation for these unique and beautiful insects.
 We hope you enjoy them as much as we do.

Mourning Cloak (Nymphalis
antiopa) : perched on

 Purple sage, Redondo Beach, CA

 

Mourning
Cloaks have a huge natural range.  They
are common throughout N. America, Europe, north-central Asia and Mexico. They
were first defined by Linnaeus in 1758 (yes, this butterfly is common in
Scandinavia!) [1]. In Great Britain, these butterflies are called ‘Camberwell
Beauties’; they do not over-winter there and must migrate from Scandinavia and
the continent [1].  They are known as
Mourning Cloaks in most of Europe and N. America [2] and are the Montana state
butterfly.

Mourning
Cloaks belong to the Brushfoot butterfly family.  The Nymphalidae include several
local favorites: the Lorquin’s Admiral, the Common Buckeye, the Red Admiral,
the Gulf Fritillary and the West Coast, Painted and American Lady
butterflies.  Our gardens would be far
less interesting without the Brushfoots.   
They are relatively large, brightly colored and fun to watch.

 

Mourning Cloak (Nymphalis antiopa) : on Grindelia hisutula

 

Nymphalis antiopa is a medium-large butterfly, with a wingspan of 2 ¼ to 4
inches (6-10 cm.).  Mourning cloaks are the only large, dark
brown butterfly in local gardens; the Metalmarks and Duskywings (also brown)
are much smaller.   Males and females
look basically the same.

Mourning Cloak (Nymphalis antiopa) : underside

 

Mourning Cloak : excellent camouflage

 

The
undersides of both sets of wings are a dark, rough-appearing brown, edged with
light tan.  The wing margins are not
smooth, but jagged.  All of this provides
good camouflage in a variety of situations. 
Mourning cloaks can virtually disappear on the dark trunks of
trees.  But they are equally able to
blend in when perched on local shrubs (see above).   They
are particularly difficult to spot in the light and shadow of some of our native
plants.   This is a good thing:
camouflage is an important way Mourning Cloaks evade predatory insects
(dragonflies), birds, lizards and others.

Mourning Cloak (Nymphalis antiopa) : upperside

 

In
contrast to the lower side, the upper side of this species is very attractive
and colorful.  The main wing color is a
rich chocolate or mahogany brown.  The
margins are banded with light tan-yellow, a nice contrast with the brown.  The pale margins are bordered inside by a
darker brown band, dotted with pale, iridescent blue-lavender spots.  The entire effect is lovely and refined.   This butterfly’s common name is said to
describe the butterfly’s appearance: a dark mourning cloak, covering a pale
dress or petticoat [2].  



Mourning Cloak (Nymphalis antiopa) : note body features

 

But
the visual treats don’t stop there.  Look
carefully at the close-up above.  Admire
the compound eye; no wonder they’re so hard to sneak up on!   Note the stout legs, used to grasp and move
around a perch. Photographs allow you to fully appreciate an insect’s intricate
beauty. Nymphalis antiopa
appears to have only two sets of legs. 
But look closely to see the short, hairy front leg.  This ‘brush foot’ gives the Nymphalidae their common name – Brush-foot
butterflies.

Notice
the stout facial and thorax (mid-section) bristles and the unusual face shape.   Mourning cloak adults have an unusual diet
for butterflies: for the most part they eat sap and decaying fruit, although
they will visit early-blooming trees (like willows) or summer-fall blooming
members of the Sunflower family [4]. Like other butterflies, they extract salts
and minerals from mud.  Not surprisingly,
Morning Cloaks are not an important pollinator species.

Adult
Mourning Cloaks over-winter as adults.  The
Mourning Cloak season begins with the emergence of adults from hibernation in
the spring.  In the warm winters of S.
California, emergence can be as early as January; you can see this butterfly in
any month in local preserves and gardens. 
But they are most frequently spotted in spring and late summer/fall.   Adults live up to 12 months – one of the
longest lifespans of any N. American butterfly [2, 5].

Willows (Salix species) : larval food for

 Mourning Cloak (Nymphalis antiopa)

 

Nymphalis antiopa is native to forests and woodland areas.  But it can be found where ever there are trees
that supply its larval food, including local wetlands, riparian woodlands,
parks and neighborhoods.  Larval food
trees include willows (Salix
species), aspens and cottonwoods (Populus
species), American elm (Ulmus),
hackberry (Celtis
spp.), hawthorn, wild rose, mulberry, birches (Betula species) and alders (Alnus
species).   The frequent occurrence of
these host species explains the widespread appearance of Mourning Cloaks in
wild and urban settings.

Morning
cloaks mate in the spring, but there may be multiple broods (a second
generation) in some areas, including S. California [3, 4].  Males choose a high perch to display to
passing females or fly in search of mates. 
Males mate with several females, and there is strong competition for
choice sites.  For more details on
courtship behaviors see references 2, 3. 

 

Mourning Cloak (Nymphalis antiopa) : perched male

 

The
males are highly territorial and will fiercely defend their territory from
other males, other butterflies (including the large Swallowtails), hummingbirds
and even humans.  We’ve seen them harass
Scrub Jays and even had one head-butt our hand. 
That’s quite a butterfly – willing to take on a human!

After
an aerial mating, females lay a cluster of eggs around a host plant twig.  Clusters contain small eggs that start pale
yellow-green and mature to black (see reference 6 for a good picture).   The female dies after laying her last batch
of eggs. 

The
larvae emerge after about 10 days, and will go through five larval stages
(instars) before emerging as fully developed caterpillars.  Each instar but the first  (which is pale, with a dark head) looks
fairly similar: a spiny, dark caterpillar with a line of red dots down the
back.  The larvae have a distinct
appearance: see reference 4 for excellent photos of all stages of development.

The
larvae often remain together through much of their development.  Like all caterpillars, they are voracious
eaters. They must be, to grow from a tiny egg to nearly 2 inches long (5^th
instar). They’ve been known to defoliate ornamental trees in other areas, but we
haven’t heard of this in S. California. 
Let us know if you’ve seen this in S. California.  For more on larval behavior see reference 3,
below.

After
the 5^th molting, the Mourning Cloak caterpillar pupates (metamorphoses
into adult form). The caterpillar leaves the host plant to search out a safe
place to form a chrysalis, often under an overhang, large branch or other
protected site (see ref. 4 for photos).  After
a 10-15 day development within the chrysalis, the adult emerges.  In warm areas, adults enter a
hibernation-like state (estivation) in the hottest part of summer, allowing
them to survive the heat. 

Mourning
Cloaks are not long-distance migrants, although they may migrate locally in
California, from lower elevation winter sites to higher elevation breeding
sites [7].  Adults over-winter in
protected sites like tree cavities, under loose bark, among dried leaves or other
sheltered places.  They emerge from
winter hibernation with the warm weather.

We
hope you’ll look for Mourning Cloaks in your own neighborhood. You likely will
find them this year.  Look for the larvae
as well as adults, if you’re lucky enough to have the host plants.  And send your photos to iNaturalist (https://www.inaturalist.org/home).   We’re sure there’s a scientist interested in
studying the yearly fluctuations in butterfly numbers.  Your pictures can help provide the data s/he
needs to conduct their study.

Mourning Cloak (Nymphalis antiopa) : in garden

 

______________

1. http://www.ukbutterflies.co.uk/species.php?species=antiopa




2. https://en.wikipedia.org/wiki/Nymphalis_antiopa
    




3. http://www.naturenorth.com/spring/bug/mcloak/Fmcloak.html
   




4. http://nathistoc.bio.uci.edu/lepidopt/nymph/mcloak.htm
      




5. http://www.desertusa.com/insects/mourning-cloaks.html
   




6. http://www.projectnoah.org/spottings/10920101
   




7. http://butterfly.ucdavis.edu/butterfly/Nymphalis/antiopa
    

 

__________________________________________________________________

 

 

Like this posting?  See
our other insect posts at: http://mother-natures-backyard.blogspot.com/2016/07/insect-postings-mother-natures-backyard.html

 

 

We encourage your comments below.  
If you have questions about the Mourning Cloak butterfly or other
gardening topics you can e-mail us at :  mothernaturesbackyard10@gmail.com

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Plant of the Month (July) : California verbena – Verbena lasiostachys

California verbena (Verbena lasiostachys) - Mother Nature's Garden of Health

Summer
has truly begun by July.  The days and
nights are warm and the early buckwheats are in full glory.  But tucked around the garden are some other summer-flowering
perennial treats.  One of these – blooming
now in the Garden of Health – is the California verbena.  The scientific name for this plant is
pronounced ver-BEE-nuh  laz-ee-oh-STAY-kiss.

The
stems of Verbena lasiostachys are
square in cross section.  California
verbena belongs to the Vervain Family (Verbenaceae).  The Verbenaceae
is closely related to the Mint Family (Lamiaceae),
which also features square stems and aromatic foliage.  In fact, some species formerly included in
the Verbena Family have recently been reclassified as Mints. 

The
genus Verbena includes a number of
species grown as garden plants.  This
genus, mostly native to the Americas and Asia, includes annuals and perennials
with small flowers that are usually pink, purple or white.   They are often planted to attract
butterflies.  But many Verbena species also have a long history
of use as medicinal plants.   So one sees
them in herb or medicinal gardens as well.

Eight
Verbenas are native to California, but only Verbena
bracteata, V. scabra and V. lasiostachys grow in Los Angeles
County.  While most native verbenas have
limited ranges, California verbena can be found in many sites throughout the
California Floristic Province (west of the Sierra Nevada Range), from Oregon to
Baja California, Mexico.  But it
particularly likes the ocean-influenced climates of western California. It can
still be seen growing wild in the lowlands and foothills of Western Los Angeles
County and on Santa Catalina and San Clemente Islands. 

California
verbena (also commonly known as Western vervain and Western Verbena) is a
sub-shrub or perennial of the Coastal
Scrub, Chaparral and Oak Woodlands, rarely appearing above about 7500 ft. (2500
m.) elevation.  It tends to grow among
and around the larger plants, usually in sunny or partly-shady spots that may
be seasonally moist or fairly dry.

California verbena (Verbena lasiostachys) - growth form

 

While
Verbena lasiostachys is classed as a
sub-shrub or part-woody perennial, its form varies greatly depending on the circumstances
in which it grows.  We’ve seen it growing
as a low-growing sprawler, as well as a more upright, open sub-shrub.  We suspect the differences in form are
related to the amount of light, soil type and possibly also how far it dies (or
is eaten) back each year.   At any rate,
its open form means it thrives around and between other plants.

California verbena (Verbena lasiostachys) - the branches

 need pruning

California verbena (Verbena lasiostachys) - new

 growth in spring

 

The
foliage of California verbena is typical for the genus: leaves that are
coarsely toothed and larger/more developed near the base of the plant, becoming
smaller up the stems.   Plants have several to many stems, adding more
stems each year.  Plants die back to
semi-woody stems in fall.  We usually
prune our plants back in late fall.  New
foliage appears with the spring rains – usually about the time the Miner’s
lettuce is flourishing in February (see above).

California verbena (Verbena lasiostachys) - foliage

 

The
variety scabrida, which is native to
Santa Catalina Island and the Santa Monica and San Gabriel Mountain foothills,
has rough-textured leaves.  The variety lasiostachys, also native to the South
Bay (including the Gardena Willows Wetland Preserve), has smooth, hairy leaves
(see above).   Both varieties do well in
local gardens.   And both look different
than just about any other native plant (other than the tall Verbena hastata).

California verbena (Verbena lasiostachys) - flowers,

 shady location

 

But
the real reason for growing any verbena is the flowers.  The genus verbena equates with small flowers,
usually violet in color, tightly packed on upright flowering spikes.  Verbena
lasiostachys has the violet-colored flowers typical of the genus.  The individual flowers are small – perhaps ¼ inch
– but the flowering spikes are up to 4 inches (10 cm.) in length.  The flowers have five petals, fused to form
two distinct lips (see below).

California verbena (Verbena lasiostachys) - flower spike

 

One
nice feature of the verbenas is that flowers open sequentially, from the bottom
to the top of the spike.  This is a
godsend for habitat gardeners; the plants remain in bloom for weeks to months.  And the flowers attract a wide range of
pollinators, from the European honey bee to native bees, butterflies and even
hummingbirds. If for no other reason, California verbena deserves to be planted
as a pollinator plant.

California verbena (Verbena lasiostachys) - flowering plant

 

While
not a long-lived perennial, Verbena
lasiostachys is easy to grow and will re-seed in many gardens.  It has a reputation for being an aggressive re-seeder;
we suspect this is mostly so in regularly watered gardens.  We’ve had only occasional seedlings appear in
our water-wise gardens, and those mostly close to the parent plant.   The seedling’s leaves are distinctive and
readily noticeable.  Seedlings can be removed
in late spring if needed.

California
verbena grows in just about any S. California soil, from sandy to poorly-draining
clays.  It does best in part-shade
(afternoon shade) in most gardens.  It
likes flat ground (it’s not one for the sides of a berm).   And it also likes good winter-spring water,
even tolerating seasonal flooding.   We
give our plants occasional water (every 2-3 weeks) through the flowering
season, then taper off irrigation in late summer. 

California verbena (Verbena lasiostachys) - Native Plant

 Garden,  Madrona Marsh Nature Center, Torrance CA

 

We
like this plant for its habitat value and old-fashioned charm.  Since it dies back, plant it among evergreen
plants or local sub-shrubs.  It will find
its way amongst the other plants each spring. 
It works well with most of the local natives, including the grasses and
sedges.  We’ve never grown it in a pot,
but suspect it would do fine.  We have grown the shrubbier Lilac verbena
in containers; it does just fine (http://mother-natures-backyard.blogspot.com/2016/09/plant-of-month-september-lilac-cedros.html)

 

California verbena (Verbena lasiostachys) - with Wooly bluecurls,

 Mother Nature's  Garden of Health, Gardena Willows.

 

And,
of course, California verbena is a pretty addition to the herb or medicinal
garden.  Verbenas, including Verbena lasiostachys, have been used as
a general tonic for many years.  Flowers
and foliage are often used as a tea or tincture for fevers and at the onset of
colds and sore throats.  This remedy also
helps calm and settle queasy stomachs.  The
plants make chemicals that likely reduce inflammation, a useful trait for a
medicinal plant.

In
summary, California verbena is a sweet little native perennial.  It’s not a summer show-stopper; that honor
goes to the sunflowers and buckwheats. 
But it is a charming pollinator plant, perfect for gardeners who love
purple and a medicinal plant to boot. 
What’s not to like?

 

California verbena (Verbena lasiostachys) - pretty perennial

 

For a
gardening information sheet see: http://www.slideshare.net/cvadheim/gardening-sheet-verbena-lasiostachys

For more
pictures of this plant see: http://www.slideshare.net/cvadheim/verbena-lasiostachys-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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