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October, 2008

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Spring Garden of Pastels: Delphiniums, Roses, Irises, Clematis, Peonies, Pansies

Spring arrives dressed in green but pastels rule the garden. Tender green peas and lettuces surround violas and pansies. Cool-weather grasses change from parched tufts to emerald carpets. Roses send out tender pink buds and irises unfurl a lavender flag. Peonies take center stage in floral tutus. None is more stately than tall spires of delphiniums standing like sentries, ranging from whites, pinks and lavenders to deep dark blues.

Clematis in blues, magentas, whites and purples crawl along chain-link fences and sweet peas the size of tiny teacups arch from wiry stems. Lime green serves as a backdrop for soft colors. If there is only one season for the most beleaguered garden, it will be spring--sandwiched between a rough winter and parched summer.

Rain arrives and brisk winds sweep through the garden, felling tall growers like delphiniums. But if you secure delphiniums, they’ll simply sway slightly back and forth. It's not necessary to tie every spire. Put four stakes around your plants. Use soft, plastic ties. Three rounds of the wire about one to two inches from each will do it. Despite the winds, they will move and cling together. Accept them as the spectacle there are designed to be. Delphiniums don’t have a long lifespan; they will decrease through the years.

Delphiniums are associated with English cottage gardens, but they grow elsewhere too: one from Iran and Iraq is small and prefers a dry, desert climate. Another is red and looks stunted. But the delphiniums so beloved are the tall spires--up to five feet high, filled with splashy, big blooms—so big that each single flower commands attention. The "bees" or center of the blossoms are furry and brown, black or white and truly look like fuzzy bumblebees. Tall delphiniums are elegant, with an architectural backdrop that towers over other perennials.

A longtime delphinium grower suggests amended soil for the plants with compost. Other than that, these perennials don’t need much in the way of fertilizing. Save every scrap from the garden for compost, making sure that there’s no herbicide lurking. With water and heat, the mixture is exactly what delphiniums adore. Apply the same soil techniques for clematis and sweet peas.

Delphiniums can take cold, even the cold of high altitude, and won’t require mulch because they don’t like damp crowns.

While most garden centers can provide fine field grown delphiniums, a true aficionado sows from seed that is hand pollinated in England. That’s how you’ll get extraordinary colors of mauve and pale blue petals. Lavish delphiniums are hybrids and their seeds won’t duplicate the parent plant.

To enjoy such extravagant blooms, you’ll have to grow the seed in a cool location. An unheated garage at just under 60 degrees with horticultural lights works well. Plant in January using sterile potting soil; it will take about three weeks for the seed to germinate. Store the seeds in a refrigerator to enhance their viability for about three years.

When the tender shoots develop a second pair of leaves, transplant them to a larger pot, but don’t place them in the garden until spring. That’s because slugs love delphinium seedlings. As the delphiniums grow, lower the light to about two inches above the seedlings and feed liquid fertilizer at quarter strength each week. Once they are four to five inches high, they’ll be safe from slugs.

Most delphiniums will bloom with about four hours of sun. But the tall bloomers will need six full hours. After the bloom, cut down the spires and you may enjoy a shorter bloom in late summer. The English Delphinium Society suggests that once your plant is established not to allow more than five spikes. If that’s too hard to do, pinch off the side branches, which gives a boost to the main stalks.

Delphiniums may be too large for your cottage garden. If that’s the case, larkspur is a substitute. These hardy annuals are grown from seed sown directly into the soil at the end of winter. You can fling them out the door into the snow and enjoy a bumper crop. Providing you don't pick every bloom, larkspur will self-seed regularly and, once established, will return year after year. Like it’s larger brethren delphinium, it is poisonous.

Sweet Peas

Sweet peas bloom at about the same time, and like delphiniums, prefer cool weather. Keep in mind that sweet peas are poisonous despite their allegiance to the pea family.

Plant sweet peas the same day that you plant garden peas. The cultivation is identical. Pinch them back after their first two pairs of leaves, which will make a shorter and stouter vine. Although some gardeners dig a trench that they fill in as the vines grow to protect them from the cold, it’s not always necessary. Just watch the first few weeks because birds or slugs will eat the tender shoots. A netting thrown over the shoots will discourage birds. Surround the shoots with a thick blanket of sharp pine needles to stave off slugs.

Sweet peas do have to be tied to a trellis; their vines will not cling. They need temperatures of about 60 to 70 degrees to germinate. And the seedlings should not be allowed to become leggy. Fertilize them every week at half strength with an all-purpose perennial fertilizer in the mornings or evenings when the temperatures are cool. They are subject to thrips and leaf miners, but most gardeners overlook these small drawbacks. Their old-fashioned perfume scents the air and chiffon petals bob in the slightest breeze.

Clematis

Like delphiniums, clematis vines grow easily in cold climates. The dark shades of clematis, if planted in bright sun, may fade, but will thrive in dappled shade and preserve their deep colors. Pale pinks or blues run along a sunny border. With the soaring popularity of clematis, there are several kinds to choose from. But most fall into one of three categories--those that bloom on new wood, those that are repeat bloomers and those who bloom in late summer. When in doubt, prune clematis after it blooms.

The general rule for clematis is that they love cool feet and sunny heads. Spread mulch over their roots and allow their tops to be exposed to full sun. It will take about three years for clematis to bloom furiously—longer if the ground is dry. They do need to be tied to a trellis or fence because clematis, by itself, is not a climber. There is a set limit to the growth and, with the exception of a few species clematis, they won’t take over to become invasive. That’s why they are safe to crawl up trees; they’ll never damage another plant.

Roses

Roses belong to a remarkable family that includes apples and pears, pomegranates and blackberries. In medieval times, rose hips supplied vitamin C to an ailing European population. The beauty of roses is legendary and it’s hard to imagine a garden without at least one rose. The difficulty is in choosing that one rose. But for beginners, roses can be divided into four broad categories: species, old-garden, hybrid teas and shrubs. Each is a study worthy of time and effort.

For the romantics, told European roses collected and hybridized before 1867 by amateur or court-sponsored botanists is an obvious draw. The apothecary rose is one example. Naturalists are drawn to species roses that are thousands of years old and designed by nature—like the Austrian copper. Traditionalists line up for modern hybrid tea roses that originated from a cross between a European and China rose in 1867. ‘Peace’ falls into this category. Pragmatists will choose modern shrub roses like Theresa Bugnet, which bring recent stalwart genes to the garden.

Keep in mind that modern roses are the most eclectic category, including roses that will never withstand the rigors of a cold or windy climate. But it also includes modern roses that are as tough as many old standbys. ‘Golden Wings,’ a five-petal shrub rose by the contemporary hybridizer, Roy Shepherd, blooms endlessly, withstands most cold, even harsh climates, with a sturdy resistance to disease.

Other modern roses like the Canadian roses or Buck roses have joined the list of popular roses to grow in difficult conditions. A few favorites are ‘John Cabot’ and ‘William Baffin’ from the Canadian list and ‘Applejack’ from the Buck category. Buck roses were developed by Griffith Buck at Iowa State University to satisfy demands for roses in mid-western winters. Canadian growers hybridized Canadian roses to withstand frigid winters. These roses carry names of Canadian explorers or Canadian cities. Each has found a respectful following around the USA.

More delicate roses are best for warmer climes.

Choose a site location with six hours or more of sunlight and good drainage as the first step. Mix compost into the soil, as much as you might use for vegetable gardens. Most roses prefer a slightly acid soil; if your soil is alkaline, compost is an equalizer and helps to neutralize any soil.

Once you’ve decided which roses grow best in your garden, there is a world of blooms to choose from. 'Jeanne LaJoie', as a miniature pink rose that turns into a vigorous climber, is a first choice. 'Banshee', a fragrant old rose, is beloved. The modern shrub English roses hybridized by David Austin remain favorites.

Many rose gardeners encourage the old-garden roses to reside alongside the newer hybrid teas. Rose trends come and go, but as rose lovers everywhere will tell you, there’s a rose for every gardener. That waft of heady fragrance, a shade of brilliant color or a robust bush that climbs over a trellis—each will grab attention.

Irises

Irises once dominated Victorian gardens where the tall swords and showy blooms commanded space and attention. They’ve fallen out of favor in recent years because of their short blooming period, but irises offer other strong points that should make them a valid choice in any garden.

Like roses, there’s an iris for nearly any climate. Japanese and Siberian irises are best in conditions that are damp with a slightly acid soil.

The tall bearded irises will withstand drought and alkaline soils. Under these daunting conditions they are pest free.

For small gardens, dwarf iris will squeeze into the tiniest spaces and produce charming flowers each spring. Although the bloom of irises may be short lived, the striking sword leaves remain beautiful throughout the summer. They’ll companion with roses and ornamental grasses, corn and hollyhocks. The lovely pallida variegated iris will mix with chartreuse-leaved coral bells and spiderwort, columbine or bleeding heart.

They require little fertilizer, just some alfalfa and compost mixed into the most unproductive soil. And most have only one request: to be divided and replanted every four years. Without this regular rejuvenation, the center will die out and the health of the plants decline. Dig them in mid-summer, separate the sword clusters, untangling their roots. Cut back the fronds to about four inches and replant. They are shallow rooted with the top of each corm slightly above ground. The corm manufactures nutrients when it is exposed to light.

Few perennials will be as easy to maintain. Irises provide a wonderful border for a vegetable garden. They also look stunning planted in mass on a hillside, but equally lovely as a single plant in a small garden. In a pastel garden, striking blue and lavender irises pair with pink poppies and coral peonies.

Peonies:

Lavish and dramatic, peonies are show-offs. Even more impressive is their longevity. Some will live over a hundred years blooming year after year for a decade or more without any need to be divided. That’s an important clue to peonies: choose their place carefully because they do not like to be disturbed.

In a small garden, peonies may take a bit too much space. Look for an awkward place that you’ll rarely disturb: a hillside behind the garden, a corner alongside a fence—wherever you plan not to dig or cultivate often. They won’t mix with fruits or vegetables well. But peonies, like irises, are a bargain. They’ll last forever, reward you with astonishing blooms and require so little in return.

They will need much more water than bearded irises, but you can plant peonies in partial shade, which will cut down on water consumption. Peonies insist on only one requirement: they like to be planted so that the bud divisions are just one to two inches deep in the soil, otherwise you may not get any blooms. There’s no need for much fertilizer, just a handful of bone meal scratched into the soil, which has been laced with compost. Single or double blooms, herbaceous or tree, peonies can take terrifically cold temperatures in winter.

Poppies:

The flower buds of poppies look like crumpled tissue, but each bloom opens to perfection, straight and smooth, as delicate as a moth’s wing. Choosing a poppy is determined by what your garden needs: bold oriental poppies for perennial color, the drought-tolerant annual California poppy for dry gravel-strewn driveways, the alpine Iceland poppy for high altitudes or the pastel Shirley poppies sprinkled among pepper plants and green beans. Most poppies adapt to ordinary soil. Perennial poppies can be divided while annual poppies are directly seeded into the garden after the last frost date.

 

Roses: The rose that will grow for you is determined by your climate. One helpful source is a small booklet put out by the American Rose Society, "Handbook For Selecting Roses." See their address below. This is a small sampling of popular roses as examples from each grouping.

Species: Rosa glauca: A species rose that blooms only once with pink flowers but offers winter interest with beautiful rose hips. While the flowers are not typical of spectacular roses, the blue-green foliage and bright red hips make this large shrub a popular choice today. These are the most basic of roses. For rose to pink colors: Rosa eglanteria, Austrian Copper, Baltimore Belle, Rosa glauca. Yellow shades: Harison’s yellow, Persian yellow, Fruhlingsgold, Hazeldean. The following are white: Rosa rugosa alba, Rosa rugosa, Rosa spinosissima, Stanwell Perpetual.

Old-garden: These roses are hundreds of years old and were cultivated in the 18th and 19th century gardens of Europe and later mixed with roses from China. Albas: Felicite Parmentier (pink), Alba Suaveolens (white), Bourbons: La Reine Victoria (pink), Variegata de Bologna (red), Centifolias: Fantin-Latour (pink), Rose de Meaux (white) Damask: Rose de Rescht (deep pink), Autumn Damask (pink), Gallica: Apothecary Rose (deep pink), Desiree Parmentier (light pink), Hybrid Perpetuals were made popular in Victorian times: American Beauty (pink), Frau Karl Druschki (white).

Hybrid Tea: Each year, new selections crowd the garden centers. ‘Peace’ is an old favorite that dates back to World War II. 'Iceberg', a floribunda German white rose is a reliable long bloomer. Floribundas are developed from hybrid tea and polyantha roses.

Shrub: A mixed collection of roses, many bred for continued blooming throughout the summer. David Austin’s roses: 'English Garden' (pale peach), 'Abraham Darby' (orange pink), 'Mary Rose' (medium pink), 'Othello' (medium red, almost magenta), 'Heritage' (blush pink), 'Falstaff' (magenta with mauve cast), 'Gertrude Jekyll' (deep pink), among many others. These roses vary in their adaptability, many are scented and will bloom throughout the spring and summer. Austin’s roses are reminiscent of the old-garden cabbage-shaped blooms. 'Therese Bugnet,' hybrid rugosa, (medium pink), a modern shrub rose with scented blooms and old-garden appeal. Striking red canes stand out against the snow.

Climbers and Miniatures: these will straddle all of the above classifications. 'The Fairy', prolific bloomer, a polyantha miniature in light pink. 'New Dawn' (light pink), 'Iceberg' climber (white), 'Victorian Memory' (pink blend) Jeanne LaJoie, pale pink miniature unscented climber and highly rated by the American Rose Society, this delicate climber is adaptable to many climates and blooms throughout the summer.

Shrubs:

Spirea bumalda

Pink Flowering Almond, Prunus grandulosa 'Rosea plena'

Lilacs, Syringa vulgaris and Syringa patula,

Daphne, Daphne x burkwoodii

Compact European Cranberry Bush, Viburnum opulus

Mock Orange, Philadephus x virginialis

Hydrangea

Perennials

Balloon flower, Platycodon grandiflorus

Lupin, Lupinus

Columbine, Aquilegia, a short-lived perennial that often self-seeds

Virginia bluebells, Mertensia virginica, good companion for tulips and daffodils

Forget-me-nots, Myosotis, often used as a ground cover, self-seeds easily as M. sylvatica; perennial is M. scorpioides companions with chives

Spiderwort, Tradescantia

Delphinium elatum, is the parent of various hybrid strains, such as ‘Giant Pacific’.

Catmint, Nepeta faassenii, 'Six Hills Giant'

Yarrow, Achillea, 'Coronation Gold' and 'Anthea'

Jupiter’s Beard, both white and pink, Centranthus ruber (red) and alba (white)

Salvia nemorosa, 'Blue Hill' and 'Maynight Sage'

Penstemons, also called beardtongue, 'Strictus’ is the species plant, Rocky Mountain Penstemon, P.barbatus 'Rondo'

Siberian Iris, Iris sibirica, needs regular watering

German (Bearded) Iris, Iris Germanica, good for arid climates

Pincushion flower, Scabiosa caucasica, 'Fama' and columbaria, 'Butterfly Blue,' widely adapted

Sweet Williams (biennial), Dianthus barbatus, many varieties of pinks from this family are early bloomers in pastel colors

Whirling Butterflies, Gaura lindheimeri, short-lived perennial

Geranium sanguineum, 'Bloody Cranesbill' (magenta) also Geranium sanguineum, 'Lancastriense' (pale pink)

Speedwell, Veronica

Lady’s Mantle, Alchemilla mollis

Dianthus gratianopolitanus, D. plumarius, edible and spicy scented. A hardy family of low-growing heirlooms.

Foxglove, Digitalis purpurea, D. mertonensis, (biennial), will self-seed but hybrid varieties will not grow true to the original plant you selected. Poisonous.

Prairie Mallow, Sidalcea, a good substitute for hollyhocks if yours are plagued by rust

Peony, Paeonia lactiflora, classic spring bloomer

Poppies, Papaver orientale, for splashy pink and plum blooms. In high altitude climates, try Papaver nudicaule, the Iceland poppy.

Bulbs

Allium aflatunense, flowering onion

Allium Sphaerocephalon, drumstick allium

Narcissus, daffodils

Eremus, hybrids, foxtail lily

Muscari, grape hyacinth, hardy bulb that will spread

Tulipa, tulips

Lilium, Asiatic lily hybrids will bloom in late spring or early summer

Crocus, cheerful early bulbs, best for rock gardens or under deciduous trees

Vines

Clematis, widely adapted, regular watering, pruning needs vary according to the variety.

Annuals

Shirley poppies, Papaver rhoeas, also called Flanders Field poppies, perfect for the vegetable garden.

Bachelor’s button, Centaurea cyanus, for a self-seeder, excellent for dry gravelly areas

Pansies and violas, Viola, accompanies the salad garden of greens, also an edible flower.

Larkspur, Consolida ambigua (formerly Delphinium ajacis), easy to grow from seed and a companion to the larger Delphinium.

Love-in-a-mist, Nigella damascena, easy to grow from seed, ferny foliage

Spider flower, Cleome spinosa, a bold annual best at the back of the garden

Sweet Peas, Lathyrus odoratus, prefers cool and moist gardens. Requires a netting or tellis.

Ground Covers

Thyme: woolly thyme, thyme minus and mother-of-thyme, Thymus serpyllum 'Coccineum' (fuschia red)

Veronica allionii, 'Allioni'

For the Shady Garden:

Bleeding Heart, Dicentra spectabilis, companion for columbines, roses and peonies, delicate flowers arch over foliage.

Coral Bells, Heuchera sanguinea, exquisite coloring in bronze, golden and lime green colors.

Monkshood, Aconitum, highly poisonous plant that is easy to grow, often a substitute for delphiniums in shady areas. Beautiful dark blue/purple color.

Lungwort, Pulmonaria, Interesting foliage, will grown in deep shade

Heart-leafed Bergenia, Bergenia cordifolia

Hosta, wide-leaved grown for its foliage; attractive to slugs so use a pine needle mulch to keep them at bay

Lamium, heart-shaped leaves that echo many of the larger heart-shaped leaves of hostas. Spreads rapidly.

Japanese Anemone: 'Honorine Jobert,' very early spring bloomer; vigorous spreader under the right conditions of shade and water

Helpful websites and places for the pastel look:

David Austin Roses, Ltd. 800-328-8893; www.davidaustinroses.com , although David Austin is British, this Texas garden center sells his roses

Jackson & Perkins, 800-292-4769; www.jacksonandperkins.com, wide-range of roses and perennials

J.W. Jung Seed Co., 800-247-5864; www.jungseed.com, roses, perennials, annuals, vegetables and fruit

White Flower Farm, 800-503-9624; www.whiteflowerfarm.com, wide selection of perennials and bulbs

Wayside Gardens, 800-845-1124; www.waysidegardens.com, perennials

Heronswood Nursery, Ltd., 360-297-4172; www.heronswood.com, unusual perennials, rare plants

John Scheepers, Inc. 860-567-0838; www.johnscheepers.com

Bulbs, Lilies, Iris and Vegetable seeds

Van Bourgondien, 800-622-9997; www.dutchbulbs.com, bulbs, perennials

Seymour’s Selected Seeds, 800-353-9516; www.seymourseedusa.com, perennial and annual flower seeds, some plants

W. Atlee Burpee Company, 800-888-1447; www.burpee.com, best known for vegetable seeds, but also a wide variety of perennials, annuals and bulbs

B&D Lilies Snowcreek Lilies, 360-765-4341; www.snowcreekdaylilies.com, lilies and daylilies

 

American Rose Society, 8877 Jefferson Paige Road, Shreveport, Louisiana, 71119-8817, 318-938-5402; www.ars.org

North American Lily Society: www.lilies.org

Heartland Peony Society: www.peonies.org

American Iris Society: www.irises.org

American Clematis Society: http://clematis.org

Robert Bolton & Son: www.martex.co.uk/hta/mb43500.htm for British sources

 


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