July 2005
Butterflies and Caterpillars in Your Garden
Butterfly
Courtesy of
The National Garden Bureau

Images Courtesy of
ImagesByBA


There is no more delightful decoration for a garden than nature’s own--butterflies. On a warm sunny day these visitors provide color and motion that doubles the pleasure of gardening. How fortunate for the gardener that it takes very little effort to make the yard attractive to butterflies!

Butterflies will visit, and possibly stay to lay eggs, wherever there is a variety of plants for food and shelter, some moisture, and an absence of pesticides. While there are typically more species in warm climates than in cooler ones, there are butterflies almost everywhere in the country. Their appearance in your backyard ultimately depends on whether their favorite plants are growing there--certain ones to support their larvae, many others to support adult butterflies.

Larvae (Caterpillar) Host Plants:

The typical garden is not likely to incidentally have plants that host the larvae of most butterflies. The caterpillars of each species are usually are pretty picky, favoring the foliage of specific plants or plant groups at this stage of their lives. Larval host plants are often unattractive, weedy and wild, generally unfit for cultivated gardens [see box]. Yet, adult female butterflies choose these particular plants (Monarch moms must have milkweed!) to lay their eggs on. This assures that newly hatched caterpillars have appropriate food immediately at hand.

Typically, young caterpillars begin voracious feeding immediately after hatching, virtually skeletonizing host plant foliage. Watch a parsleyworm, (a swallowtail caterpillar) devour the foliage of Queen Anne’s Lace, carrots, or parsley! Butterfly larvae grow as they eat, shedding their skins 4 to 6 times before achieving maximum size for pupating. Only then do they desist, becoming immobile in a hard chrysalis suspended from a leaf or stem of the larval host plant until emerging as an adult butterfly.

All-time Butterfly Flower Favorites:

-Aster
-Black-eyed Susan
-Butterfly bush
-Butterfly weed
-Coreopsis
-Joe-Pye weed
-Lantana
-Liatris
-Pentas
-Purple Coneflower

Butterfly Host Plants:

Fortunately, adult butterflies have more cosmopolitan palates. The flower nectar they need for energy is available in lots of different flowering plants. They will visit your yard in search of those that are most easily accessed by their long, coiled tongues, or proboscis, which enables them to reach deeply into the center of flowers where the glands that produce the sweet nectar are located. They are particularly attracted to hot-colored, fragrant flowers. They get further nutrition from moisture from puddles and raindrops, rotting carrion and other liquids--even human perspiration if you stand very still--that provide traces of minerals and nutrients not in nectar.

Butterfly


Butterfly Garden Design:

The butterfly gardener’s challenge is to provide diversity of plants in communities throughout the property to support both larvae and adults. Variety is the key. Choose lots of kinds of plants--herbs, annuals, and perennials as vines, groundcovers and in beds, plus shrubs and trees. Wildflower meadows featuring native plants are ideal. Food crops add to the diversity too. Assure that blooms are available to visiting butterflies for the entire season. The greater the variety of suitable plants, the greater the potential number and variety of types of butterfly visitors.

It is not necessary to integrate larval and adult plants throughout landscape. Just allow some part of your yard or nearby property to remain weedy and undeveloped to lure female butterflies to lay eggs. Somewhere in the yard, let fresh water accumulate to support communal “mudpuddling”, so butterflies get soil salts and minerals as well as moisture. Overripe fruit that has dropped from trees also provides nutritious moisture. Finally, butterflies like some flat stones for basking, or sunbathing, to gather warmth to power their wings.

Butterflies visit flowering plants that are in full sun and in sites sheltered from wind in beds or containers. Protect garden beds exposed to the wind with a hedge of glossy abelia or butterfly bushes or a wall or pergola covered with honeysuckle or passionflower. Flowering shrubs provide shelter for roosting too. The more fragrant, the better. Plant at various heights, because like birds, certain butterfly species prefer to feed at certain heights. (Some species are even quite territorial and try to chase others from favorite plants).

Finally, unlike the famous monarchs which migrate to Mexico and other points south, most butterfly species overwinter nearby. This means that their eggs, chrysalises, or larvae are likely to be in or near your yard during the non-gardening months. Some will even hibernate as adults. Do not mow weedy sites and dismantle woodpiles which provide them safe shelter in the off-season.

Caterpillars: Distinguishing Friend From Foe

Butterfly larvae tend to be solitary, or sparsely distributed, whereas pest caterpillars such as fall webworm make tents and hatch in the hundreds. The latter are best handled by pruning the tent out of the tree or breaking it open so that the birds can eat the immature larvae.

However, even in sparse numbers butterfly caterpillars can damage ornamentals or food plants. For example, the ubiquitous white cabbage butterfly lays lots of eggs that turn into destructive green worms which devour cabbage and broccoli and their relatives. An insecticide product containing Bt (Bacillus thuringiensis) sprayed onto plant foliage will handle feeding worms that threaten to destroy crop yields. In the case of parsleyworms on parsley, simply moving them to a non-essential plant such as wild carrot will both save the crop and preserve the eventual butterfly.

Butterflies

Favorite Larval Host Plants:

-Asters
-Bermuda grass
-Clover
-Hollyhock
-Lupine
-Mallow
-Marigold
-Milkweed
-Nettle/thistles
-Parsley
-Passionflower
-Plantain
-Snapdragon
-Sorrel
-St. Augustine grass
-Turtlehead
-Violet

The Best Butterfly Blooms Are:

-composites, umbels, and panicles, whose clusters of small florets provide many sips plus a place to pause.
-brightly colored in lavender, purple, red, orange and yellow.
-single-flowered types where the nectar is more accessible.
-flat or tubular in varied lengths.
-planted in drifts and clusters for efficient grazing.
-fragrant.

Flowering Plants Whose Flowers Attract Adult Butterflies:
 

Aster, New England
Aster novae-angliae
Beebalm
Monarda sp.
Black-eyed Susan
Black-eyed Susan
Rudbeckia sp.
Blanket Flower
Blanket flower
Gaillardia sp.
Blazing Star
Blazing star

Liatris sp.
White Butterfly Bush
Butterfly bush

Buddleia sp.
Butterfly weed
Asclepias tuberosa
Candytuft
Candytuft

Iberis sempervirens
Cardinal Flower
Lobelia Cardinalis
Catmint
Nepeta
Purple Coneflower
Coneflower, Purple

Echinacea purpurea
Daisy, Ox
Leucanthemum sp.
Gas plant
Dictamnus Fraxinella
Goldenrod
Solidago sp.
Globe thistle
Echinops Ritro
Hyssop, Anise
Hyssop, Anise

Agastache Foeniculum
Joe-pye weed
Eupatorium purpureum
Jupiter's beard
Centranthus ruber
Lantana
Lantana

Lantana Camara
Lavender
Lavandula sp.
Lupine
Lupinus
Milkweed, Swamp
Asclepias incarnata
Milkweed, Common
Asclepias syriaca
Mountain bluet
Centaurea sp.
Pentas
Pentas

Pentas lanceolata
Phlox
Phlox, Garden

Phlox paniculata
Sneezeweed
Helenium autumnale
Sage, Scarlet
Salvia coccinea
Tickseed
Coreopis sp.
Turtlehead
Chelone glabra
Verbena
Verbena

Verbena bonariensis
Yarrow
Yarrow

Achillea sp.
Zinnia
Zinnia

Zinnia sp.




 
The South Carolina Nursery and Landscape Association has many experts who can assist you. A list of these individuals who reside nearest to you can be found in the membership section on this web site. You may also view past articles here. For an extensive list of consumer related gardening topics visit the: Clemson Extension Service Home and Garden Information Center.