Category Archives: flowers

Virginia Bluebell Season Is Almost Here!

Virginia bluebell season is around the corner so plan now to see carpets of this ephemeral wildflower here in Virginia. Although mid-April has been the peak time in the past, it may come earlier since we had such a mild winter. Here are a few places in Northern Virginia to view colonies of bluebells; some places are already reporting blossoms now in March.

Bluebells (Mertensia virginica) are synonymous with early spring. Their blue trumpet-shaped flowers bloom above the green foliage in deciduous woodlands before the trees leaf out. These perennials emerge early in the year, bloom for a few weeks in March or April, and then die back to become dormant in the summer. The plants like the moist soil of the forest, high in organic matter. They self-seed and create colonies which is why you will see carpets of blue in the parks below. If you look closely, you will see that the buds are pink opening up to blue but the overall effect is a blue haze. These are native wildflowers, but you can purchase the plants from nurseries.

Balls Bluff Regional Battlefield Park (Northern Virginia Regional Park Authority), Balls Bluff Road, Leesburg.

Bull Run Regional Park (Northern Virginia Regional Park Authority), 7700 Bull Run Drive, Centerville. This park has a Bluebell Trail just off the Bull Run Occoquan Trail near the Atlantis Waterpark.

Great Falls Park (National Park Service), 9200 Old Dominion Drive, McLean.

Manassas National Battlefield Park (National Park Service), 6511 Sudley Road, Manassas. Best view is from the Stone Bridge.

Merrimac Farm (Virginia Department of Game and Inland Fisheries), 15014 Deepwood Lane, Nokesville. They have a free, family-oriented bluebell festival on Sunday, April 7 from 10:00 am to 3:00 pm.

Riverbend Park (Fairfax County Park Authority), 8700 Potomac Hills Street, Great Falls. Riverbend Park is celebrating bluebells on Saturday, April 6, 2024, from 10:00 am to 2:00 pm. There is a fee for attending this family event; however, the public can visit anytime to view the bluebells.

Scott’s Run Nature Preserve (Fairfax County Park Authority). 7400 Georgetown Park, McLean.

Turkey Run Park (National Park Service), George Washington Memorial Parkway, McLean.

A Spring Flower for your Garden: Columbine (Aquilegia)

Spring has many woodland bloomers: bluebells, dutchman’s breeches, bloodroot, yellow trout lily, trilliums, and columbine to name a few. Of these, columbine (Aquilegia spp.) can adapt to live successfully in your own garden. Columbine plants are low growing perennials noted for downward faced flowers with long, thin spurs that reflex back. These shade tolerant plants are often found in moist, woody areas.

In the mid-Atlantic region we either see the native species, Eastern red columbine, or cultivars of the common columbine. Eastern red columbine (Aquilegia canadensis) has red and yellow flowers with spurs. This native is a critical food source for the ruby-throated hummingbird in the spring. The Virginia Native Plant Society dubbed it wildflower of the year for 1998. There are other columbines native to this continent but not to our mid-Atlantic region.

The native species blooming at Oak Spring Garden

The common columbine (A. vulgaris) has been bred to produce flowers that are single or double petaled, in shades of purple, blue, dark rose, rose, pink, white and even very dark purple to black.

Both are easy to grow from seed as long as you provide stratification–that period of cold to induce germination. If you are purchasing seed, you can provide stratification in one of four ways:

  • Place the seeds in a plastic bag with moist seed starting mix. Place the bag in the fridge for 3-4 weeks. Afterwards, you can start the seeds indoors under lights about 8 weeks before the average last frost or sow directly outside after the last average frost.
  • Sow the seeds in small plastic containers with moist seed starting mix and either put in the fridge, an uncovered cold frame, an unheated porch, or a shed where the temperature remains consistently between 35 to 45 degrees. When the average last frost date has passed, continue to grow outside.
  • Scatter seeds in your garden in the fall and let winter provide the cold stratification.
  • Sow a few seeds in a plastic gallon milk jug with about 3 to 4 inches of soil in December and leave outside, uncovered, until spring. In the spring, open the jug and transplant the seedlings into the garden. This method is called winter sowing.

Once your plants are established, they will self-sow. In fact, columbines are notorious for cross pollinating so if you want one particular color, grow only that plant. Do not mix up your seed. Mine have been in my garden for almost 20 years and are a mix of purples and blues. I know I have sowed several different types over the years, but these colors must be the hardiest.

Columbine blooming at the National Arboretum

Columbine plants are deer resistant, and the flowers attract hummingbirds, butterflies, and hawk moths. After the spring, the foliage will remain which does tend to get leaf miners but this will not kill them. Leaf miner damage just goes with the territory, there is not much you can do other than snip off the damaged foliage. The unsightly silver “doodles” on the leaves is caused by leaf miner larvae tunnelling their way through the middle of the leaves. The Eastern red columbine is supposed to be more resistant to leaf miner than the hybrids. In the winter, these plants die down and become dormant. Foliage emerges as early as February.

In our area, we have plenty of spring native plant sales so you may find small plants of the Eastern red columbine. If not, check out these seed companies for both the native species and the hybrids.

Close up of the center of the flower

Snowdrops: From Simple Flowers to Complex Collections

galanthusEasy to grow, snowdrops are pushing through the snow now. These small bulbs are usually planted in the fall, in masses or drifts. Here in the mid-Atlantic area, snowdrops (Galanthus nivalis) bloom any time from January through March.  Hardy to USDA Zone 4-7, they prefer cool weather, partial shade, and rich soil. They are not fazed by deer but may get relocated by squirrels. By late spring, the green, strap-like leaves die back and the bulb is dormant during the summer.

Snowdrops seem so simple, so humble, like servants to queen daffodils and regal tulips. Here in America, they are a small sign that spring will come soon. In Great Britain, however, snowdrops enjoy a cult status. The English have been breeding snowdrops extensively since the Victorian era, yielding over a thousand cultivars. There are judging events and snowdrop clubs, grand events and exhibits.

To me they are pretty but they look similar. To a galanthophile, each flower is distinct. Galanthophiles collect the cultivars, some of which can be costly. They may also collect other Galanthus species — there are about 20 species that vary in bloom time and size.

Here in this country, we are not able to access a wide variety but a good source for many snowdrop cultivars is Carolyn’s Shade Gardens in Pennsylvania. Another source is David Culp’s annual Galanthus Gala which will be on March 1 & 2, 2024, in Downingtown, PA. David, a well-known breeder, lecturer, and author, has a collection of snowdrops, among other plants, in his gorgeous gardens at Brandywine Cottage. The Galanthus Gala is open to the public, registration is required, and includes speakers and other plant vendors.

Winter Blooming Witch Hazel

Early Bird

Early Bird

One of my favorite winter bloomers is witch hazel, a small shrub-like tree.  The flowers themselves are only a few inches, but their unique shape and ability to cover dark, bare stems with flashes of color add excitement in winter gardens. The flowers are really clusters of four petals shaped like thin ribbons emanating from a dark, leathery base called a calyx. Depending on the cultivar, these one-inch to two-inch long ribbons are translucent yellow or mustard yellow, red/orange or brown/orange, or scarlet red or rust red. On warm winter days, the ribbons unfurl. As temperatures drop, the ribbons curl back as a protective mechanism against the cold.

Gingerbread

Gingerbread

Witch hazels are about 15 to 18 feet tall and wide, with wavy-edged, hazel-like leaves. In the fall, the leaves turn a striking yellow, sometimes with orange or red tinges, before dropping to reveal an open vase structure.

There are many Hamamelis species but the common ones are: Hamamelis japonica (Japanese witch hazel); H. mollis (Chinese witch hazel); H. vernalis (Ozark witch hazel); and H. virginiana (common or Virginia witch hazel). The first three are hardy to zone 4 or 5 while the last is hardy to zone 3. Common witch hazel is known for its use as an astringent in cosmetics. Hamamelis x intermedia is a cross between H. japonica and H. mollis – many cultivars have been bred from this to extend the flower color range as well as fall color of leaves.

Amethyst

Amethyst

Witch hazels like well-drained but evenly moist soil. They are forest understory plants, small enough for suburban properties but possibly requiring shade from the summer sun unless one can guarantee against drought. Usually they are not troubled by pests or diseases.

Witch hazels plants are easy to find at local nurseries in the spring but now is the time to view them in gardens in order to select your favorite flower color.  In Alexandria, Virginia, Green Spring Gardens has more than 200 Hamamelis plants. Green Spring Gardens’ witch hazel collection became an official Plant Collections Network (PCN) collection in 2006. PCN, a part of the American Public Gardens Association, is a network of botanical gardens and arboreta that coordinate preservation of germplasm. Member gardens make the germplasm available for studies, evaluation, breeding, and research. While Green Spring Gardens has the most extensive collection in the Washington DC area, you also can see them in bloom in other public gardens such as Brookside Gardens in Wheaton, Maryland, and the U.S. National Arboretum in Washington DC. Check out these perfect plants for the winter garden today so you can add few to your own garden this summer.

Hamamelis intermedia "Hiltingbury'; Hiltingbury WH

Hiltingbury

All photos are from Green Spring Gardens, courtesy of the Fairfax County Park Authority.

Tips on Taking Care of your Cyclamen Houseplant

If you received or purchased a blooming  cyclamen over the holidays, here are tips for taking care of this regal queen.  Also called florist’s cyclamen (Cyclamen persicum), this houseplant blooms during the winter with flowers raised high above the foliage, lasting for several months. Cyclamen is available in a range of sizes, from mini to large, as well as magenta, red, pink, and white flower colors. Beautiful as it is, cyclamen is not an easy plant to grow.

While it is blooming, give it bright indirect light. It prefers day temperatures of 60-70 degrees and night temperatures of 40-50 degrees. It also prefers high humidity. Usually homes in the winter have low humidity so place the plant on a tray of pebbles with a little water. However, make sure you have a saucer between the container and the pebbles. The root system is a tuber that is prone to rot.

Water when the soil feels dry, like dry in the top inch, but before it is completely dry. Do not let it sit in water and do not let it sit in the saucer of water. Likewise, when watering, aim for the side of the crown, not on the leaves, and not on the crown (central growing point). If you purchased it in the decorative foil covering, it best to remove that and put the pot (make sure it has drainage holes) on a saucer.

Feed the plant with a diluted liquid low nitrogen fertilizer to prolong the blooms, such as an African violet fertilizer.

After flowering, the leaves will turn yellow. Your first thought may be that it is dying and you need to water or fertilize but don’t do that. The plant is beginning its dormant stage. Don’t try to keep it green with more watering, let it rest during the summer. Put the plant in a cool, dark area with good air circulation. Don’t water or feed during its dormant period.

In the late summer, early fall, bring the plant back to bright indirect light and water thoroughly at first. You will see new green growth. Treat it like when you first purchased it and it should bloom again. It may not look as luscious, but the regal queen should continue to hold her court as a long lasting houseplant.

Herb of the Year for 2024: Yarrow

Every year, the International Herb Association chooses the Herb of the Year and publishes a compendium for that herb. For this coming year, 2024, the Herb of the Year is yarrow (Achillea).

A member of the Asteraceae (daisy or aster) family, yarrow is an Old World herb, primarily from Europe.  There are more than 100 species but Achillea millefolium is the most common and one of the most widely used medicinal plants in the world. The plant is a few feet tall and wide with small white flowers, grouped together in a flat-headed corymb (like an umbel).

Since yarrow has been used medicinally for thousands of years, it has obtained many interesting common names: dog daisy, dog fennel, milfoil, soldier’s woundwort, thousandleaf, devil’s nettle, carpenter’s weed, nose bleed, old-man’s-pepper, and stenchgrass. The botanical name comes from Achilles in the literary Trojan War of the Iliad who used this herb to staunch the wounds of his soldiers. The specific epithet, “millefolium,” refers to the finely dissected foliage, which appears like a thousand leaves.

The medicinal properties of yarrow are recognized worldwide and included in the national pharmacopoeias of Germany, France, and Switzerland. This plant has been used as a tonic, for relieving abdominal pains and flatulence, and has anti-inflammatory, anti-spasmodic, diaphoretic, diuretic, wound-healing, and anti-bleeding properties.

Even in this country as recent as the Civil War, yarrow was used to staunch the soldiers’ bleeding.

Achillea millefolium is not a native plant but it has naturalized here and is commonly found in fields and along roadsides. Some may think the plant is too weedy for the garden but as a garden plant, yarrow is a hardy, drought tolerant perennial that blooms from summer to fall.

You are more likely to see cultivars of A. millefolium on the market that have been bred to have stronger stems, a more upright growth habit, and a wider range of flower colors (pink, lemon, red, peach, bicolors, and pastels). These do not look “weedy” and make great garden plants. The photo below is Summer Pastels which is a 1990 All America Selections Flower Winner selected for its beautiful color range and strong stems.

This perennial is a full sun plant but not particular about soil. The aromatic foliage is of no interest to deer. Flowers, which butterflies love, can be cut and used for fresh or dried flower arrangements.

You may find this plant in the perennials section of the nursery instead of the herb section. Most people do not know it is an herb but think of it as a flowering perennial. You also can grow yarrow from seed, here is a list of seed catalogs. If you have a friend who has yarrow, ask for a division. It is easy to lift an established plant and divide in the spring.

Add this plant to your garden in 2024 and check out the compendium when it is published later in the year. There is a compendium for each Herb of the Year, available to the public for a nominal fee.

First photo: Illustration of yarrow from Köhler’s Medicinal Plants, 1887-1898

Second Photo: Photo of Summer Pastels courtesy of All America Selections

Planting Tulips in Containers for a Spring Show

China Town, photo courtesy of flowerbulbs.com

I was in a garden store the other day that sported the annual boxes of bulbs on the far side of the wall. Normally I do not purchase tulips because they do not always come back in my Virginia garden. Deer and rabbits eat them; squirrels will dig them up. But I had a new, large container on the deck which deer and rabbits could not access, and these bulbs were only a dollar each, so why not?  I thought it would be fun to create a spring show.

The photo of China Town on one of those boxes grabbed my heart. It is a “viridiflora” type that blooms pink with green streaks up each petal creating a pink/green blossom. The foliage is bluish green with white margins. China Town was awarded the Royal Horticultural Society Award of Garden Merit.

Usually when tulip bulbs are planted in the ground they are spaced 4 to 6 inches apart but in a container, they are planted much closer. I was able to fit 10 bulbs in a 22-inch Rim Crescent Garden container, about 6 to 8 inches deep.

After I planted the bulbs, I watered the container and then added more soil to plant yellow pansies, Johnny jump ups, and a few sprigs of sedum for winter color. This container is in full sun and unless the pansies begin to wilt, I will depend on the rain and/or snow to water the bulbs. Although it is possible to fertilize tulips when planting them in the ground, I did not do it for this container. The potting mix is new and comes with some fertilizer.

Although deer and rabbits are not a problem on my deck, the squirrels think nothing of digging through all of my containers. To deter them, I sprinkled Espoma blood meal. If I had not planted the pansies, I could have kept the squirrels out by covering the top of the container with chicken wire, kept in place with pins, or covering with something sharp like spiny brambles, stems with thorns, or crushed eggshells, all of which would be removed in the spring.

The viridiflora type of tulip should bloom in May and is considered a “late” blooming tulip. The blooms last several weeks and make good cut flowers. China Town will grow to 12 inches, which is short for this category; most grow to 20 inches.

Technically, tulips are perennials but most of the bulbs you see for sale now are treated as annuals here in this area because of our hot summers. There are many types of tulips of course so any of the bulbs you see for sale now could be planted in a large container with drainage holes. And if you see a sale, you can’t go wrong!

Photo of China Town courtesy of flowerbulbs.com

Mandevilla: Tropical Beauties Worth Keeping

mandevillaMandevilla plants are popular summer bloomers here in this area.  I have always admired these vigorous climbers with bright, large, trumpet-shaped flowers. Usually, I see pink, red, or white blossoms, but there are other colors on the market.

Mandevilla is a member of the Apocynaceae family, also known as the dogbane family, cousin to Plumeria (frangipani), Nerium (oleander), Vinca (periwinkle), Amsonia (blue star), and Hoya (wax plant). Native to southeastern United States, Mexico, Central America, South America, and the West Indies, these are considered tropical plants here in the DC area. Mandevilla was named after Henry Mandeville, a British diplomat and gardener who discovered this plant in Argentina and sent it back to England in the 1800s.

tango twirl mandevilla

Tango Twirl has fully double petals, photo courtesy of Doreen Wynja for Monrovia

In recent years, there has been a tremendous amount of hybridizing with mandevillas. There are many lines or series such as Sun Parasol, Sunvilla, Bombshell, and Parfait. There are plants that are more compact than the species, really compact for containers, and plants with variegated foliage, double-petaled flowers, and new flower colors such as apricot. They are all beautiful, but they are not cheap. Although they may cost a little more, they thrive in our hot, humid summers; are deer and rabbit resistant; and attract butterflies and hummingbirds.

They do need support and should be planted with a trellis or obelisk or planted near a pergola or a fence. If they are grown in containers, they will need fertilizer in the summer for continuous blooms.  They are actually very versatile. I have seen them in containers at gas stations where they thrive despite the heat and neglect and I have seen them used to decorate arbors, arbors and pergolas.

arch

Brookside Gardens in Wheaton, Maryland

Because these are tropical vines, hardy to Zone 10, they will die here in the DC area in the winter. But you can protect them over the winter so they can be brought outside again next year for another season of beauty.

apricot colored flower

Apricot is an unusual, apricot colored flower, photo courtesy of Doreen Wynja for Monrovia

There are basically two ways to do this. One is to grow them like houseplants indoors and the other is to let them go dormant for the winter. In the fall, before the temperatures dip below fifty degrees, bring the plant inside. Remember that night temperatures can dip below fifty even though day temperatures are still warm in the fall.

To grow like a houseplant, trim them back first. It can be a real haircut, up to one half of the foliage, but do it so you are removing leaves and stems for reducing transpiration, not to make it ugly. Then place in a room that has much light as possible while as cool as possible. Water less frequently; do not fertilize. It may not bloom but that is okay, it is just surviving for a few months. Keep watching for pests. In the spring, prune and fertilize. In early June bring the plant outside. Place in shade first and gradually move to full sun.

The dormant method is to bring the plant indoors and trim back to about twelve inches. Put in a cool garage or basement where temperature is above freezing. Make sure it does not dry out completely. Water only to prevent it from drying out. In the spring, bring it in the house to increased light and heat. In early June, bring it outside. Again, shade first and gradually to full sun.

This way, your mandevilla plant should provide color every summer and you will certainly get your money’s worth.



Growing Zinnias That Are Resistant to Powdery Mildew

Mexican zinnia

I grow zinnias every year in my Virginia garden. Zinnias are probably one of the easiest flowers to grow from seed in this area. These warm season annuals can be sown directly into a container or on the ground after the last frost. They need full sun, good air circulation, and they are not particular about the soil. The flowers attract butterflies and bees; deer do not bother the plants.

The only hitch is that some species are prone to powdery mildew. Our hot and humid summer is an ideal environment for this fungal disease that creates a white coating on the plants. It does not kill the plants but makes the foliage unsightly. However, there are some zinnias that are resistant to powdery mildew.

Narrow-leaf zinnia, Zinnia angustifolia or Z. linearis, is a foot tall, bushy plant with narrow leaves and small, single, daisy-like flowers. The flowers are about an inch wide with single-colored petals such as orange, red, pink, white, or yellow. Because of its compact size, it makes an excellent window box or container plant and can be used in the garden as a border plant. These are small but you cut a bunch and put in a small vase.

Zinnia angustifolia

Mexican zinnia (Z. haageana) is like narrow-leaf zinnia in shape, size, and foliage. The flowers are a little larger and can be single, semi-double, or double petals. Each flower has more than one color – usually a spectrum of sunset colors: red, orange, burgundy, yellow, and cream. I discovered them when I purchased Renee’s Garden Persian Carpet mix, which I love. There are other flower blends such as Aztec Sunset, Jazzy Mix, Old Mexico, and Soleado. Again, small flowers but a bunch can be cut for small vases. These are excellent for containers and as border plants.

There are two series of zinnias that have been bred specifically for powdery mildew resistance:  Z. marylandica, also called Zahara, and the Profusion series. Zahara has flowers that are larger than the two previously mentioned species, about 2 to 2 1/2 inches wide. There is a wider flower color range too. The plants are taller, about 18 inches high, which is better for floral arrangements. Profusion is pretty much the same as Zahara, a taller zinnia with larger flowers. Zahara and Profusion give you a wide range of colors to pick from, these are easy to find in seed catalogs.

All of these are going to be easier to find if you look for the seed instead of a plant in a garden center. The companies below have these varieties and here is a list of more than 100 seed companies if you want to look for more zinnias.
Burpee
Johnny’s Selected Seeds
Kitchen Garden Seeds
Park Seed
Renee’s Garden

Mexican zinnias in a vase

 

Purple Blooming Anise Hyssop

anise hyssop at the National Herb Garden in July

Anise hyssop (Agastache foeniculum) is blooming now in the summer. A native, herbaceous perennial hardy to zone 4, this plant is short-lived but self-seeds and spreads a bit by rhizomes. In March, the leaves emerge with a purple hue. As the plant grows the leaves become green although there is a golden cultivar. A member of the mint family (Lamiaceae), the leaves have scalloped edges and look like catnip leaves. Anise hyssop grows a few feet tall and about one foot wide. In the summer, there are small purple-blue flowers on 4 to 6-inch terminal spikes, creating fuzzy wands. The flowers attract beneficial pollinators, including butterflies and hummingbirds. Because the foliage is so fragrant, deer are not interested.

Anise hyssop is a full sun to part shade plant tolerating a wide range of soils in a well-drained site. The purple-blue flowers provide contrast to orange and yellow flowers and complement purple foliage plants.

purple foliage of anise hyssop in March

Anise hyssop can also be used as a culinary or tea herb. It is harvested for its leaves as well as its flowers. Although the aroma is categorized as anise or licorice, some might say anise with a touch of basil or anise with a touch of tarragon. The most common use of the leaves is tea but you can also add the leaves to lamb or pork dishes, to milk for making ice cream, sugar syrups, and/or sugar syrups for cough drops, cocktails, honey, butter cookies, and sugar to make flavored sugar. The leaves dry well, retaining their taste and fragrance.

Flowers are edible and can be used as a garnish for desserts, added to a salad, or added to a beverage such as ice tea. The flowers also dry well, retaining their color and aroma.

You can find small plants in the nursery in the spring or you can grow anise hyssop from seed. Sow the seed indoors under lights in order to transplant outside after the last frost or sow directly outside in the summer. Anise hyssop can be propagated by root division.

Anise hyssop is a great garden plant — it provides color in the summer, supports pollinators, and can be used for making tea or to add flavor and color to meals.