What’s in Bloom D thru H


Dahlia, Mystic Illusion Yellow

The new Dahlia Mystic Illusion Yellow has gorgeous, bright yellow blooms that pop against its rich, dark purple (nearly black) foliage. ‘Mystic Illusion’ is well branched and makes a strong statement in beds, borders, and containers.

Location:  at the front of the Entry Garden. (2015)



Who doesn’t enjoy a bed full of colorful daylilies?

Crimson Food and Lemon Berry Frost Daylily

Crimson Food and Lemon Berry Frost Daylily

No investment in perennials pays off like one in daylilies:  foliage that looks great all season, flowers in a rainbow of colors, no special care and now, many that reward you with both a spring and fall season of bloom. “Reblooming Daylilies” are just what they claim. Most have a big bloom during regular daylily season in late spring, and then bloom off and on for the rest of the season, usually with a burst of bloom before fall.

But whether yours are the old favorites or the brand new ruffled-up fancy faces, they’ll all reward you with a big perennial show for very little care. And since they don’t demand absolute full sun, daylilies also let you sneak some of the color back into shady areas, making them one of the best shade perennials.

Location:  next to the fence in the Boulder Garden and in the Fountain Garden.(2017)


Deodar Cedar Feelin’ Sunny Dwarf

Deodar Cedar Feelin' Sunny has golden foliage, April

Deodar Cedar Feelin’ Sunny has golden foliage, April

You might be familiar with deodar cedar as a big tree, one that easily tops 100 feet.  Feelin’ Sunny is a fraction of that size, only 2 to 4 feet tall.  It’s a golden, dwarf, weeping form of deodar cedar that was introduced by Monrovia in 2013.  It can spread out to 6 feet.

fall foliage

Feelin’ Sunny has a bright, golden yellow foliage that is stunning when planted to contrast with darker green-leaved trees or shrubs.  It can be an outstanding accent or large container specimen.  Or plant it in mass for a dramatic effect.  Feelin’ Sunny loves full sun.  And after the first year, it doesn’t need much water.

Location:  on the south, sunny side of the Entry Garden. (2018)


Desert Willow

Desert Willow is a smallish size tree with willow-like foliage. It has a mature height and spread of approximately 12 to 15 feet. It’s a perfect size for planting near a deck, patio or garden entry.

But Desert Willow’s most endearing quality is its sweet-scented, orchid-like flowers that appear in late spring and bloom through summer. They have the delightful aroma of sweet violets and come in lovely shades of white, pink and lavender-maroon.

Location:  the west side of the staircase in the Boulder Garden. (2018)


Dianthus, Neon Star

Dianthus Neon Star, April

Dianthus Neon Star, April

This hybrid has a compact, mounding habit, with silvery-blue foliage and fluorescent pink toothed flowers, which continue blooming with deadheading.

Plant in full sun and well-drained soil. The vibrant pink flowers have a spicy clove fragrance. It is best mulched with stone chips, sand, or gravel to avoid fungal diseases.

Location:  west side of the staircase in the Boulder Garden. (2018)


Dichondra, Silver Falls

Dichondra Silver Falls makes a slivery ground cover.

Dichondra Silver Falls makes a silvery ground cover.

Dichondra Silver Falls has soft, rounded, silver colored leaves on trailing stems. It can be used as a ground cover or for great contrast in a mixed plant container. It also is effective along rock walls where it can cascade downward. From a hanging basket, it will cascade downwards to 3-6’ long in one season. As a ground cover, plants only rise to 2-4” tall, but spread rapidly by stems rooting at the nodes to 3-4’ wide in one season.

Dichondra Silver Falls cascades over a wall in front of a Ruby Falls Weeping Redbud.

Dichondra Silver Falls cascades over a wall in front of a Ruby Falls Weeping Redbud.


Along the drive below the steps from the Entry Garden (right)

Next to the steps leading from the Entry Garden to the drive (left) (2018)


Euonymus, Emerald Gold

Although Emerald Gold can achieve somewhat larger dimensions by maturity if left alone, these shrubs are most often pruned to be kept compact. With their low-mounding habit, Emerald Gold can function as a ground cover as shown in our garden.

Grow them in well-drained soils either in the sun or shade. However, they will produce their best color display if planted in full sun.

Location:  in several locations in the Boulder Garden.(2018)


Euphorbia, Diamond Frost

We can’t talk enough about this little plant – what a stunner. Whether you have a large garden, small patio or just a sunny windowsill, Diamond Frost Euphorbia is a must-have. It produces delicate, gray-green foliage with ethereal white blossoms. Even though it looks very delicate, it is a tough plant – both heat and drought tolerant. It blooms constantly throughout the summer. The unstoppable flower power and airy form make it an excellent alternative to baby’s breath, which tends to fade quickly.

This is a wonderful plant to use in your container garden to act as a filler and to make those other plants stand out. It also can fill up a bare spot in a flower border.  Spaced 9 to 10 inches apart, the plants will quickly grow together resulting in a frothy drift of white blooms. It is a compact grower reaching a mature height of 12 to 18 inches. Give it full sun to partial shade and good drainage and Diamond Frost will bloom from spring until temperatures drop below 32 degrees in fall. In the fall you can bring them indoors as a houseplant and they look absolutely wonderful in a pot with poinsettias.

Location:  tucked into different areas of the garden such as in the Boulder Garden.(2015)


Evolvulus, Blue My Mind

How about a touch of blue for your garden?

Blue My Mind Evolvulus is a dwarf morning glory evolvulus hybrid from Proven Winners.

You’ll love how well it performs in the heat of the summer. It loves the sun and hot weather; be sure to protect it from light frosts that might happen in the late spring or early fall so that this evolvulus can keep showing off.

The electric blue flowers will almost glow in the sunlight and will make an impressive display in containers or in the landscape. The silvery-green leaves help the bloom color pop. Blue My Mind is a trailing and semi-mounding plant. It can look particularly stunning when combined with other colors such as lime green, light yellow, and white, either in the garden or in containers.

Location: in the sun of the Boulder Garden along the lower pond walk (2017)


Fever Few

This traditional medicinal herb is used to prevent migraine headaches, or for ornament. It is also known as Chrysanthemum parthenium or bachelor’s buttons.

Location:  Herb Garden. (2015)


Fothergilla, Blue Shadow

Fothergilla, mid-March

Fothergilla, mid-March

In April, Fothergilla shows off it’s dazzling bottle-brush flowers.

Fothergilla Blue Shadow has proven to be a showstopper. This alluring plant cries out for attention with its beautiful spring flower display, gray-blue summer foliage and exceptional, rich-red leaves in fall.

Of all its favorable attributes, the striking blue hue is what really sets this Fothergilla apart. It’s a winner in landscapes and provides a sharp color contrast to companion plants, particularly those with golden foliage. ‘Blue Shadow’ forms a dense network of angular stems.

It’s an upright grower that broadens with age, eventually becoming 5-6 feet high and wide. It is tolerant of both full sun and partial shade. A semi-shade location will result in a more open habit.

Like other Fothergilla, ‘Blue Shadow’ is native to the Southeast and has no known disease or insect susceptibilities.  It thrives in somewhat acidic soil with good moisture and adequate drainage.

Location:  Boulder Garden path, Entry Garden (2018)


Fringe Tree, White

Fringe Tree, late March

Fringe Tree, late March

White Fringe Tree is a prized large shrub or small deciduous tree with upright branches forming a dome shape.  This tree is a show-stopper when in full bloom.  The blossoms are clusters of lightly fragrant white flowers that may turn the tree totally white in spring for about two weeks just as the leaves begin to emerge.

Fringetrees are excellent anywhere that a very small tree is needed, such as near a patio, in small yards, or under power lines. Like many white-flowered plants, they look especially nice planted in front of a dark backdrop. They can be used as individual specimens, in groups, in mixed shrub borders or in natural gardens. They are well suited to urban plantings due to pollution tolerance and adaptability to varied soils.

The ideal exposure for fringe trees is sun through most of the day, but shade during hot afternoon hours. Fringetrees have low maintenance needs once established.

Location:  at the top of the Boulder Garden along the path. (2018)


Gaillardia, Arizona Apricot

This free blooming, long flowering perennial is hardy in Tulsa’s zone. The blooms are yellow at the edges, then deepen to a rich apricot color at the center. Relatively maintenance free, it becomes drought tolerant after it is established. Removing old blooms will encourage continuous flowering.

This close cousin to our state wild flower is as tough as it is beautiful.

Location:  Butterfly Garden. (2017)


Garvinea (Gerbera Daisy)

Garvinea, April

Garvinea, April

Would you like some color in your garden? It’s easy with Garvinea.  Garvinea is a revolutionary new gerbera with a unique combination of features. Using genetics from wild South African plants, breeders have managed to come up with a color palette of strong, prolific, free flowering gerberas which have cold tolerance and superior pest and disease resistance.

Garvinea are happy in full sun to part shade and look gorgeous mass planted in garden beds and large containers. What Garvinea lacks in flower size compared to other gerberas it more than makes up for in its quantity of flowers, with each plant yielding well over 70 blooms per year.

Garvinea are winter hardy and survive where temperatures may drop to -5°C. Come spring the flowers will start popping up for another long season. Being pest and disease tolerant means that Garvinea are much easier to grow than most other gerberas.

Location:  on the sunny side of the Entry Garden above the driveway test beds.(2018)


Gaura, Sparkle White

Gaura Sparkle White will bring a touch of airy elegance to the garden with its long slender stems sporting a large number of dainty white flowers tinged with a pink blush. This beauty is perfect mass planted in sun-drenched landscape beds, in groupings with other perennials or in larger containers.

Home gardeners will appreciate that this season-long bloomer also has excellent heat tolerance and a more uniform flowering habit than other gauras. It is a 2014 All American Selection award winner.

Gaura Sparkle While does not need deadheading and can be grown in full or partial sun. It blooms from late spring to frost.



Location: Butterfly Garden and Boulder Garden. (2017)


Geranium, ‘Biokovo Karmina’ hybrid used as a ground cover

Geranium Biokovo Karmina, late April and on

Geranium Biokovo Karmina, late April and on

Perennial Geranium is always a favorite for its excellent mounding habit and masses of flowers from late spring to mid-summer. Geranium plants are tolerant of both wet and dry conditions.

Geranium Biokovo Karmina, from the Biokovo Mountains in Europe, can be used as a ground cover. It grows a short 6-12” high and makes a wonderful filler plant for any landscape. In fall the aromatic foliage takes on a red tint adding season-extending interest. It is deer resistant and beneficial for pollinators.

Geranium Biokovo is a tried and true plant that is good for beginners.

Location:  a flowering ground cover in our mostly-shady Entry Garden, to the right as you near the Linnaeus statue. (2017)


Grass, Adagio Maiden

Adagio Maiden Grass is an early flowering beauty with reddish/white pendulous plumes that move in the slightest breeze. Nothing can compare to the beauty of ornamental grasses in our Tulsa landscapes. They can withstand our hot summers and provide so much interest in the fall and winter when our perennials have gone dormant.

Grasses that flower after mid-summer are warm-season grasses, because they wait until the warmth of summer before starting into growth, then grow rapidly and come into flower between mid and late summer. The flowers turn to seed heads and remain showy for many months. They are normally planted where they can fill the ground once spring flowering bulbs or perennials are past their best

Adagio is a year-round grass that remains standing even through heavy snowfalls. The combination of the tan foliage with spring flowering bulbs is a nice contrast. In Tulsa it should be cut back to about 5 inches from the crown of the plant when new growth begins to appear.

This grass is easy to grow and is a good choice for busy homeowners. It will grow in almost any soil, and does not require good drainage. Grow this grass in full sun.  Fertilization is not necessary.

Location:  the Entry Garden and in a number of areas throughout the garden. (2017)


Grass, Japanese Blood

Japanese Blood Grass is an ornamental grass with tufts of intensely red leaf blades that will add a striking touch to any landscape. It has an upright and open growth habit.

It can be used for a wide variety of perennial design conditions including borders, rock gardens, and containers. Japanese Blood Grass does best in full sun and is drought resistant.

Location:  in our Boulder Garden near the bridge. (2014)


Grass, Mexican feather

Mexican Feather grass is a cute little mounding plant worth trying in the garden, especially if you want an easy-to-grow planting that will do the wave all by itself every time the wind blows.

This 1 to 2 foot tall perennial bunch grass grows like a cascading fountain. The wiry, slender, hair-like leaves are green and silky in the spring and buff-colored during winter and our Tulsa summer heat. Once fall arrives it begins growing again when temperatures cool and rains return.

It is a wonderful filler in your sun garden to help soften a rocky area or an area where plants are hard to grow.

Location:  near the footbridge in the Boulder Garden. (2017)


Hawthorn, Indian

spring blooms

spring blooms

fall purple-black berries

fall purple-black berries

Indian Hawthorns are low maintenance, flowering, evergreen shrubs with either pink or white flowers which are produced in abundance during spring making them an excellent substitute for azaleas in full sun.

They are exceptionally drought tolerant plants and the foliage is evergreen.

Indian hawthorn produce abundant purple-black berries from late summer through the winter.

Location: along the path in the Boulder Garden and along the driveway curve next to the oakleaf hydrangea. (2018)



Hellebores are widely grown in gardens for decorative purposes. They are particularly valued by gardeners for their winter and early spring flowering period.  The plants are surprisingly frost-resistant and many are evergreen.

Hellebores are herbaceous plants and reappear in the very early spring when other plants are just coming out of hibernation.

Location:  in the Boulder Garden right below the Deck Overlook. (2018)


Holly, Nellie Stevens

Nelly Stevens Holly, March

Nelly Stevens Holly, March

Nellie Stevens Holly is fast growing and can create a privacy screen with beautiful berries in winter that carry over into spring.

Nellie Stevens Holly is self pollinating, but if a male holly is used as a pollinator, it can help produce more spectacular berries in greater quantity.

When blooming, the sweet smell of Nellie Stevens attracts bees and butterflies.

Location:  along the drive below the Entry Garden. (2018)



Hydrangea, Mopheads

Hydrangeas, which come in types that can flourish in sun or shade, offer huge bouquets of clustered flowers, in various arrangements from mophead to lacecap to panicle from summer through fall. Some, such as oakleaf, offer stunning fall foliage as well.  Dwarf varieties are available for smaller gardens.

The Linnaeus Teaching Garden has several varieties of hydrangeas categorized into 4 different types: mophead, lacecap, oakleaf and panicle.  Come browse all our selections and see what might work best in your gardens.

Mopheads (Hydrangea macrophylla) are the most popular hydrangeas grown in home gardens and landscapes. Most mopheads grown today are blue or pink. A few varieties are white.

Any of the hydrangeas below (except the white ones) can be either blue or pink, depending on the soil composition. If you’re seeking blue hydrangea flowers, check your soil’s pH level and apply aluminum sulfate in spring to lower pH to the 5.2-5.5 range.  You can find short videos on YouTube that demonstrate the process.

Here are some of the mopheads that you can see at the Linnaeus Teaching Garden, Location: Entry Garden. (2017)

 Big Daddy

Just like the name suggests this hydrangea has huge blooms which are perfect for flower arrangements.

Glowing Embers

This gorgeous ornamental shrub with large, lush crimson flowers is truly an eye catcher. It has a compact habit with coarse, deep green glossy foliage with a pretty red tinge. It is a very easy plant to grow as it is disease and pest-resistant. Blossoms are large, 10-12″ across and dry well for winter enjoyment.

Blushing Bride

The name of this hydrangea says it all. Pure white blooms with semi-double florets gradually mature to a sweet, pink blush.

Reliably blooming on both old and new growth, you can experience the beauty of Endless Summer Blushing Bride again and again, all summer long.

 Endless Summer

Endless Summer has a height of 3 – 5′ and was the first macrophylla type to bloom on both old and new wood for large, colorful flower mops all season long. It is remarkably hardy and mildew resistant. The bloom color is blue but will turn pink in alkaline soils and sometimes both blue and pink blooms can be seen on the same plant.


Hydrangea, Lacecaps

The Linnaeus Teaching Garden has several varieties of hydrangeas categorized into 4 different types: mophead, lacecap, oakleaf and panicle.  Come browse all our selections and see what might work best in your gardens.

Lacecaps (Hydrangea macrophylla normalis) are looser, more graceful and more subtle in their effect than the mopheads. Otherwise, they are treated exactly the same including altering the soil pH level to produce more blue or pink (see ‘Mopheads’ above).

There is no doubt that mature lacecaps can be magnificent. They fit quite naturally into woodland locations, snuggling under and around trees such as dogwoods and other shrubs. Spectacular single specimens can also light up a front yard.

Here are some of the mopheads that you can see at the Linnaeus Teaching Garden, Location:  Entry Garden. (2017).

Let’s Dance Starlight

The Let’s Dance Hydrangea series represents the next generation of re-blooming hydrangea. This series kicks up the quality with vivid flower coloration and attractive foliage. It blooms on both new and old wood delivering seasons of flowers and lots of wow to make you want to dance. It also takes more sun then other hydrangea’s but still requires the same well-drained soil.

The best time to prune this series is after it blooms, from mid-July to mid-August. Cease pruning in mid-august to allow time for flower buds to form prior to winter.


Light-O-Day Hydrangea features stunning, pure white variegation on its foliage. Pair that remarkable quality with large, lacecap blossoms and you have a great attention grabber to add to your garden or containers. Light-O-Day’s outer ring of flowers is a stunning bright white. The delicate inner blooms are a beautiful blue or soft pink depending on your soil type.
New gardeners will find it’s an easy-to-grow, show-stopper. Light-O-Day is a compact grower, making it perfect for urban gardens and containers. The unique foliage and blooms add eye-catching brilliance into your garden border.

Twist n Shout

Like all plants in the Endless Summer Collection, Twist-n-Shout produces abundant blooms on both old and new wood all summer long. Lacy deep-pink centers are surrounded by gorgeous blossoms of pink or periwinkle blue, depending on soil type. Sturdy red stems and glossy deep green leaves turn red-burgundy in fall to offer year-round interest in the garden.

Easy to care for and hardy to zone 4, Twist-n-Shout is an elegant stand-along specimen, dramatic in combination with other plants, and compact enough for containers.


Hydrangea, Oakleaf

Oakleaf hydrangea is one of the few hydrangeas native to the US. It is a dramatic, white-blooming shrub with four seasons of interest. It blooms best in areas where summers are somewhat hot, but it is winter hardy farther north than the mophead hydrangea.

A tremendous advantage of the Oakleaf is that it can thrive in much dryer locations than its cousins.

The Oakleaf gets its name from the shape of its beautiful large leaves. These leaves often turn colors of brilliant red, orange, yellow and burgundy in the fall if planted in a sunny location with a little afternoon shade.

Oakleaf hydrangea can tolerate and even thrive in much sunnier areas than the mophead and lacecaps. But it is important to provide excellent drainage when planting this hydrangeas as it can get root rot in a heart-beat if it stands in soggy soil even for short periods.

Do you love Oakleaf Hydrangeas but don’t have a space in your yard to accommodate their large size? Well, Pee Wee Oakleaf Hydrangea works beautifully in a small space. It blooms all summer and has deep burgundy colored leaves in the late fall. It will get to be about 4 feet high and wide.

Location: Entry Garden, east end before you enter the gate, facing the driveway (Alice), and west end as you enter near the Linnaeus Teaching Garden sign (Pee Wee). (2017)

‘Alice’, one of the largest of the oakleaf hydrangea

Alice Oakleaf Hydrangea in autumn: multiple seasons of color

Pee Wee, a dwarf oakleaf perfect for smaller gardens


Hydrangea, Panicle

We have four categories of hydrangea at the Linnaeus Teaching Garden: lacecap, mophead, panicle, and oakleaf.

Vanilla Strawberry Panicle Hydrangea: blooms begin vanilla-white in midsummer (July).

 They turn strawberry-red later in the season.

Vanilla Strawberry can be found in the Entry Garden near the Tree of Discovery.

Unlike mopheads, panicle need several hours of sun to do well. If your weather is too cold to grow the pink and blue hydrangeas or if your landscape doesn’t have much shade, consider growing one of the many types of panicles.

Another desirable trait of all panicles is their tolerance for pruning. One can prune them at any time except when they begin forming bloom heads in the summer. The panicle is the ONLY hydrangea that can be pruned into a tree form.

 Phantom Panicle Hydrangea – one of the largest

Phantom has conical flower heads, up to 15 inches long, which are the largest of all panicle hydrangeas. The blooms unfold midsummer as a creamy white, then graduate to a blushing, soft pink as the summer progresses. Phantom is a heavy bloomer with sturdy-stemmed flowers that do not flop.

 Dwarf White Panicle – perfect for smaller gardens This dwarf hydrangea makes a pretty setting amid Bubblegum Supertunias on the sunny side of the Entry Garden along the driveway.

The name “panicle” comes from the fact that many of the blooms are panicle-shaped (somewhat cone shaped) rather than ball-shaped.   Many panicle blooms, such as those of Phantom which you can find in a pot by our west Barn door, develop a lovely pink shade as the blooms age, extending their beauty into the fall.

Changing Flower Colors

Whereas many bigleaf hydrangeas (H. macrophylla) can have pink or blue flowers depending on the soil, the color of panicle hydrangeas’ flowers do not change based on the soil chemistry. Rather, it is a change in temperature that triggers their flowers to turn from white to pink or red in the fall. In southern zones where nighttime temperatures are still quite warm in the fall, the color change will not be as pronounced as it is in the north where temperatures fall quite a bit more at night.

Since new flower heads continue opening into late summer, plants can display multiple color stages at any one time.

Location:  Entry Garden and near west Barn door. (2017)

More What’s In Bloom: WIB A-C WIB D-H WIB I-Q WIB R-Z