What’s in Bloom R thru Z


Ragwort, Golden

Golden Ragwort, late Martch

Golden Ragwort, late March

Golden Ragwort is a beautiful plant in flower and makes an effective ground cover even in dry shade conditions. For these reasons it is often used in native landscape gardens and meadow plantings.

The nectar and pollen of the flowers are attractive to small bees. Golden Ragwort is a carefree plant which prefers full sun to light shade in wet to moist soils with ample organic matter to retain moisture. The blooming period occurs early spring and lasts about three weeks.

Location: Boulder Garden (2018)


Redbud, Burgundy Hearts

This exciting new Redbud has new growth that emerges as a shimmering red-purple and the heart-shaped leaves remain burgundy throughout the season. Showy pink-lavender flowers appear before the leaves in spring. It is very easy to grow and adapts to most conditions.

Location:  Boulder Garden (2018)


Redbud, Oklahoma

Oklahoma Redbud, late March

Oklahoma Redbud, late March

The Oklahoma Redbud is highly drought tolerant once established and grows well in all areas within its hardiness range of 6B thru 9A. Its deep pink to red flowers appear in profusion up and down the tree limbs in springtime, well before the leaves begin to emerge, creating probably one of the best Redbud displays.

Oklahoma Redbud also has a subdued red-burgundy fall color. As a young tree it will benefit from some training and pruning to form an upright, more uniform crown.

Location:  Boulder Garden next to the fence (2018)


Redbud, Ruby Falls Weeping

Ruby Falls Weeping Redbud in Spring.

Ruby Falls Weeping Redbud in Spring.

Ruby Falls is a fantastic new Weeping Redbud variety with dramatic foliage color. Ruby Falls blooms prolifically in early spring when bunches of tiny, hot pink, rose-purple, pea-like flowers accentuate the bare, pendulous branches and trunks for 2-3 weeks before the foliage emerges.

Ruby Falls Weeping Redbud in Summer.

Ruby Falls Weeping Redbud in Summer.

As the year progresses rich ruby-purple leaves appear, gradually changing to deep green during the summer. In the fall the foliage changes to bright yellow. With its unique and elegant weeping habit, this plant is perfect for small gardens, lawns or woodland gardens. This tree can grow up to 6′ with a 4′ spread. It’s the first weeping purple redbud developed. Minimal pruning is needed.

Ruby Falls,, late March

Ruby Falls,, late March

Location:  Entry Garden next to the steps leading to our annual display beds (2018)



Southgate™ Rhododendron, April

Southgate™ Rhododendron, April

The exciting new Southgate™ Rhododendrons are heat tolerant and thrive in the Deep South while performing equally well in traditional Rhododendron areas.

Southgate™ Grace is an evergreen shrub.  It’s deep-pink buds open to white or light pink in spring and attract birds and butterflies. Grace gives year-round interest. It prefers part sun to shade.

Southgate™ Radiance, April

Southgate™ Grace, late March

Radiance has deep lavender buds that open to light purple in spring.  It has a compact habit and is disease and pest resistant.  Radiance looks especially good when you plant it in masses. A hedge of Radiance Rhododendrons is stunning in the spring. It also will work well in your favorite large container as a striking specimen plant.

Location:  in pots around the Barn (2018)


Rosa ‘Chuckles’

Rosa ‘Chuckles’ is an ever-blooming dark pink rose from May to September that does well in mass plantings (grows to three feet tall) and is tolerant of light shade. It is a floribunda rose with single flowers (petal count 5-11) that are 2-3 inches in diameter held in large clusters toward the tips of the canes. For fall and winter interest, bright red fruits hang on through the winter.

Location:  Boulder Garden above the pond (2018)


Rose – Knockout Roses

Pink Knockout Rose

Pink Knockout Rose

Knockout Roses were selected as an All-America Rose Selection winner in 2000, and the patented Knockout roses quickly became the largest-selling rose variety in North America. Now they are a staple of home and municipal landscapes and parks due to their carefree attitude and showy, summer-long blossoms.

These roses start blooming in spring and continue until well into fall with very little care. They are resistant to black spot and other diseases, will tolerate partial shade, quickly respond to pruning, and are tolerant of all but the most extreme heat and drought. Knock Out roses can be used anywhere in the landscape, from roadside plantings to garden borders to containers and specimen plantings.

Location:  outside the fence along the driveway (2018)


Rose – Knockout Rose, Rainbow Coral

The Rainbow Coral Knockout Rose covers itself with coral pink blooms with a rich yellow center. It has compact growth and blooms nonstop all summer. This award-winning rose is outstanding and puts on a flower display all summer in the garden.

The blossoms are a lovely coral-pink color with a semi-double form. The foliage is resistant to disease — even in humid climates. It’s great for mass plantings. Or just blend it in with your perennials for nonstop summer color.

Roses need sun (at least 6 hours daily); well-drained, fertile soil; and consistent and adequate soil moisture to thrive and produce the most blossoms. And like all the other Knock Out Roses, rainbow coral is resistant to blackspot, powdery mildew, and rust – no wonder it can bloom so heavily and long.

Location:  along the driveway curve below the Entry Garden (2016)


Rose of Sharon (Althea)

The 10′ tall shrub is not actually a rose but is in the Mallow Family and is sometimes called “Shrub Althea”. Carl Linnaeus classified Hibiscus syriacus in the 18th century based on a herbarium specimen from Syria to which the species apparently had been imported long ago, since its origins are from India and East Asia.

Rose of Sharon comes in many colors – especially white, lilac, and pink. It occurs as a single flower, or as a hybridized double. Blooms first occur in late spring and continue through early fall, making Rose of Sharon one of the few summer-blooming shrubs.

Individual blossoms open in early morning, close at night, and usually last less than three days. Regardless of the flower’s color, there is almost always an intensely maroon central spot formed by a concentration of pigment at the bases of five large petals. Rose of Sharon goes into a very long resting period and is one of the last shrubs to green up in spring.

Rose of Sharon Helene

Rose of Sharon Helene

Rose of Sharon is a great plant that can be pruned to show off its multi-trunks. We have several examples in our garden. Treeing it up enables the eye to see through the branches to any hardscaping or plants behind it to give the view a layering look.

Location:  Boulder Garden along the west stream near the Greenhouse, Fountain Garden and other locations (2018)


Rose of Sharon (Althea), Fireworks

How about a multi-color Rose of Sharon for your garden?

This woody shrub is excellent for late summer garden color. Plants can get to around 12′ tall by 10′ wide and grow in somewhat of a vase shape. Flowers are white, red, purple, pink or violet or a combination and either single or double.

Also known as Hibiscus Syriacus Tri Color, this plant starts to flower in June and continues through September. It grows well in about any soil and has done nicely in our garden during both rains and hot weather.

You can control the size of this plant with heavy pruning in the early spring each year which also helps to produce larger flowers in summer.

Location:  Fountain Garden and in the Entry Garden by the steps along the driveway (2018)



Rosemary is a woody, perennial herb with fragrant, evergreen needle-like leaves. The flowers appear in winter or spring and are variable in color, being white, pink, purple, or blue.

Since it is attractive and tolerates some degree of drought, rosemary is also used in landscaping as it is easily pruned into shapes and has been used for topiary.

The fresh and dried leaves are used frequently in traditional Mediterranean cuisine. They have a bitter, astringent taste, which complements a wide variety of foods. Rosemary is extremely high in iron, calcium, and Vitamin B6.

Location:  Herb Garden


Rudbeckia (Black-eyed Susan), Triloba

Triloba rudbeckia is a three-lobed Coneflower with hundreds of small deep gold flowers with brown centers that bloom for almost three months. This plant is very resistant to drought, heat and pests. Butterflies and other pollinators like the nectar and songbirds eat the seed, which forms as flowers age.

We have it displayed in a container and it is extremely eye catching. Its airy growth habit with blue-green leaves and yellow (Brown-eyed Susan) flower blowing in the wind make it one of the prettier Rudbeckia’s.



Pink Autumn Sage

Pink Autumn Sage

Pink Preference Sage

Pink Preference Sage

Brilliant fluorescent pink flowers cover green mounds of highly scented foliage. Truly a heat and drought tolerant plant, Pink Preference Sage flowers from late spring until frost and is perfect for rock gardens and containers.

Location:  Boulder Garden on the west side of the stairs (2018)


Salvia, Mexican Bush Sage

Maybe one of the most attractive salvias, Mexican Bush Sage (salvia leucantha) is prized by gardeners for its ornamental and showy velvety flower spikes produced from late summer to the first frosts when other summer plants have given up hope of doing anything productive.

This evergreen shrubby perennial typically grows 4-6′ high and wide in a wonderful display of very attractive, bi-color flowers consisting of soft purple sepals and fuzzy white flowers.  They rise in dense, arching spikes above the lance shaped gray-green leaves.

Mexican Bush Sage thrives in full sun (but tolerates partial shade) in evenly moist, average to rich, well-drained soil.  It is drought tolerant but does best with regular moisture.
Location: Butterfly Garden (2017)


Salvia, Blue

Blue salvia is a favorite of many gardeners because it’s a cinch to grow, flowers profusely all summer, and is wonderfully drought tolerant. It’s a great choice for both beds and borders and containers. This herbaceous perennial is native to areas of North America. It has a compact habit, its water needs are low, and the heat tolerance is excellent.  Salvia adds height to plantings and will also attract butterflies and hummingbirds to your garden!


Here are some of the Blue Salvia that you can see at the Linnaeus Teaching Garden, Location: Butterfly Garden. (2018)

May Night Salvia

May Night Salvia grows tall spikes of indigo blue flowers top compact mounds of soft, green foliage. It thrives in areas where spring and summer nights remain cool.

Velocity Salvia

Velocity Salvia is a bushy, upright plant with intense dark blue flower. It makes an excellent plant for adding height to combination containers. It is the earliest flowering Salvia farinacea on the market.





This Australian native annual withstands heat without wilting and produces blue and white fan-like blossoms all summer.

Drought tolerant, it is low maintenance, grows well in containers, and reaches heights from 6″ to 3 feet.

Location:  Entry Garden (blue variety) and along the lower walk of the Boulder Garden (white) (2015)




Sedum is a large genus of flowering plants in the family Crassulaceae, members of which are commonly known as stonecrops. The genus has been described as containing up to 600 species updated to 470. They are leaf succulents found primarily in the Northern Hemisphere, but extending into the southern hemisphere in Africa and South America. The plants vary from annual and creeping herbs to shrubs. The plants have water-storing leaves. The flowers usually have five petals, seldom four or six. There are typically twice as many stamens as petals.


Location: Boulder garden, along the lower walk  (2018)


Serviceberry, Autumn Brilliance

Early spring flowers (late March-April) give way to equally showy edible fruit.

Early spring flowers (late March-April) give way to equally showy edible fruit.

Autumn Brilliance Serviceberry grows from 15 to 25′ tall with multiple stems forming a dense shrub or, if pruned properly, a small tree. It adapts to a very wide range of soils and is somewhat drought tolerant.

Its spectacular show of white flowers in early spring is one of its main ornamental features. They begin as a pale pink, then fade to snowy white fragrant flowers. Its young leaves are purplish in color, then turn red, orange, and yellow in the fall. The fruit is round, sweet and edible in summer which is good for wildlife and also for human consumption.

To sum it up, here is an easy to grow plant which is featured in many gardening and landscape magazines.

Location:  Boulder Garden (2018)


Smoketree, Grace

Grace Smoketree is an elegant hybrid of the European and North American species. Light red spring foliage matures to rich wine-red leaves. These evolve to a showy mix of orange, red, purple and golds in the fall. Frothy purplish-pink clusters of flowers resemble smoky plumes, adding drama to the landscape in midsummer. Upright and spreading, this low-branched tree develops a rounded head as it reaches about 20 feet in height with a 15 foot spread.

Like all smoke trees, Cotinus ‘Grace’ is disease free and drought tolerant. It requires full sun and will not grow well in shade. In low light conditions it has a lax habit and will not flower or develop foliage color. Cotinus ‘Grace’ will grow in a wide range of soils with average fertility.

Location: Boulder Garden near Memorial Arch (2018)


Spirea Hybrids

Double Play Gold Spirea, June

Double Play Gold Spirea, June

Spireas have undergone a huge transition over the past few decades.  New dwarf hybrids are much more reined, yest as weather tough as the gangly old spireas from the past.  We have several varieties on display at the Linnaeus Teaching Garden.

Bright gold foliage contrasts with abundant, hot pink spring flowers on Double Play Gold Spirea. It maintains its neat compact mounded shape with very little pruning. More intensely colored than other varieties, this spirea adds season-long impact to gardens with very little effort. It is ideal for foundation and mass plantings.

Location:  in the Fountain Garden and numerous other locations (2018)


St. John’s Wort, Blue Velvet

This attractive shrub has beautiful blue foliage and golden yellow flowers in mid-summer. Tolerates most soil conditions, but must be well drained.

St Johns Wart is a sun loving, mounding, and densely branched shrub with lustrous blue green foliage. Bright, clear yellow flowers blanket this disease resistant plant. St. Johns wart is easy to grow, and adapts to most conditions.

Location:  on the wall between the Veggie and Fountain garden (2015)



Helianthus annuus (sunflower) is a perennial plant that usually spreads rapidly and becomes invasive. It can grow to six feet tall in woodland areas, next to creeks and available moisture.

Not only do sunflowers add bright color to your landscape, their seeds attract birds.

Location:  Vegetable Garden (2015)


Sunflower, Summer Night False

False sunflower is also known as ‘smooth oxeye’. It is native to eastern North America, including eastern Canada and the eastern United States.

This species is a perennial that grows 16–59 inches tall. The toothed leaf blades are oval to triangular or lance-shaped and may be smooth or hairy or rough in texture. The flowers are produced from midsummer to early autumn.

In the wild this plant may be found in wooded areas, in tallgrass prairie, and sometimes along roadsides. It is a popular garden plant, and several cultivars are available with flowers of varying colors and shades

Location:  Boulder Garden (2015)



Hot Coral, a compact Sunpatien, July

Hot Coral, a compact Sunpatien, July

SunPatiens® is a revolutionary new hybrid impatiens bred by Sakata. These remarkable plants represent a breakthrough in flower breeding: robust, sun–loving, heat–loving impatiens that thrive in full sun or part shade and deliver continuous color from spring through frost. Whether used in baskets, window boxes, patio pots or in the landscape, these beautiful plants combine massive flower power with tough, low-maintenance plants that flourish almost anywhere.

The SunPatiens family consists of three unique series, each offering a distinct growth habit that is perfect for nearly every garden application. Three season performance is the hallmark trait for all the series so regardless of which variety you select, your SunPatiens will be covered with beautiful flowers from spring, through the torturous heat of summer, right up to the first hard frost. Note: This description is courtesy of the Sakata website. See all their varieties at http://www.sunpatiens.com

Coral Pink Sunpatien, Compact

Coral Pink Sunpatien, Compact

Location:  Entry Garden.   (2018)


Sweetspire, Virginia

This old time favorite native plant for southern landscapes has been used for generations because of its seasonal beauty, hardiness, durability and resistance to disease and insect pests. Virginia Sweetspire has many notable characteristics – gorgeous white, slightly fragrant flowers that show up in late April to May and superb fall color.

It is tolerant of wet soils, yet amazingly it has very good drought tolerance. It performs equally well in full sun or light shade.  However, the foliage gets denser and the flowers are more abundant in full sun.

Flowers are formed on the previous season’s wood so we should always wait until after flowering to prune. In the fall, the leaves change to burgundy-purple which presents an attractive contrast to broadleaf evergreens in the landscape.

Plant them in masse for best effect – if given adequate sunlight and moisture they will supply many years of enjoyment.


Location:  Herb Garden, Boulder Garden, and other places throughout the Linnaeus Garden (2018)


Swiss Chard

Red Chard

Red Chard

This leafy green vegetable is often used in Mediterranean cooking. It is considered to be one of the most healthful vegetables available. Not only that, it can add color to your ‘edible’ garden. The leaf blades can be green or reddish, while the leaf stalks are usually white, yellow, or red.

Location:  Vegetable Garden (2016)


Torenia, Catalina®

Catalina® Midnight Blue™

Catalina® Midnight Blue™

Torenia is a compact, mounding annual and tender perennial. It’s flowers appear as tiny trumpets.

Catalina® varieties are high-value plants with an extra helping of heat tolerance and oversized blooms. They are also among the few varieties that bloom in the shade, and are a wonderful alternative in areas where downy mildew is a concern. This series comes in an array of colors. The Linnaeus Garden has several on display in our shady areas.

Catalina® Grape-O-Licious™ is a continuous bloomer or re-bloomer hybrid from Proven Winners. It is heat tolerant and can be planted in part sun or full shade. No deadheading is necessary on this annual.

Catalina® Grape-O-Licious™

Catalina® Grape-O-Licious™

Catalina® Midnight Blue can really add a blue accent to your shade garden.  It is an early, long blooming series, has excellent heat tolerance, loves the shade, and makes a great, low-maintenance ground cover.

About all you need to do for these plants is apply fertilizer and compost on garden beds to help ensure the best possible performance.

Location:  near the Memorial Arch and Fountain Garden  (2017)


Vegetable Arch

Use trellises to save space in your vegetable garden.

Use trellises to save space in your vegetable garden.

Cucumbers grow well on a trellis.

Cucumbers grow well on a trellis.

Tight on space, but love to grow vegetable crops? Try growing vining crops on trellises: The plants are more exposed to sunlight and air, so they are less troubled by mildew and other diseases. And since most of the fruits dangle off the ground, they are less susceptible to rotting.

Many melons can thrive on a trellis. But because they’re heavy, you’ll need to support them with cotton or nylon slings

Location:  Visit our Heirloom Vegetable Garden to see this great space-saving trellis idea in action as well as other handy practices such as raised beds and container crops. We use cattle panels that we curve from one raised bed to another for our trellises.(2018)


Verbena, Bonariensis Meteor Shower

Verbena Meteor Shower has good looks AND personality. Its lollipop lilac blooms on deep green foliage shoot upright.

Verbena Meteor Shower is a fun plant for landscapes and containers. A truly compact form of upright verbenas, it does not require deadheading to continue its blooms, and it is heat and drought tolerant. It is extremely low maintenance and attracts birds, butterflies, and bees.

Location:  by the pond and the fish at the bottom of the walk around the Boulder Garden (2016)


Vervain, False

Nectarwand Red False Vervain

The False Vervains are some of the top hummingbird and butterfly attracting plants.  These verbena and lantana relatives also go by the names of Porterweek, Snakeweed, Smuggler’s Vervain and Rooster Comb. The botanical name of this tropical American genus is Stachhytarpheta.

Butterflies love the clusters of flowers as well as hummingbirds because they can land on a stem and sample several flowers with their long proboscis without having to move around.

False Vervains are rarely seen in American gardens even though they bloom continuously spring to frost with loads of strong whip-like flower spikes in jubilant colors of red, purple, blue and pink.


Location: Butterfly Garden (2018)


Viburnum, Blackhaw

Pretty white flowers appear in spring.

Pretty white flowers appear in spring.

Blackhaw Viburnum is a large tree or multi-stemmed shrub with impressive dark green foliage in summer months changing in the autumn to a purple, rich red burgundy color which is quite showy.

Our Blackhaw viburnum grows near the arched bridge.  It is 10-foot tall and 8-foot-wide.  It delights visitors year around.  In spring, it covers itself with creamy white flowers.  By late summer, clusters of dark blue, edible fruit gracefully hang amid rich green foliage.  And in late fall, this large deciduous shrub erupts into a flaming mass of bright red and orange foliage.  Even during the dead of winter, its gray vase-shaped branches are beautifully statuesque.

This delightful native shrub should be used more in Tulsa gardens.  Blackhaw viburnum is a tough and beautiful shrub, ideally suited for single specimen use, screening, wildlife habitat and mixed shrub borders.

Autumn foliage is colorful.

Autumn foliage is colorful.

Location: Boulder Garden (2018)


Viburnum, Summer Snowflake

Snowflake Viburnum, early April

Snowflake Viburnum, early April

Viburnum Summer Snowflake is a beautiful white flowering shrub that makes an outstanding background for beds and mixed borders. It spreads out generously along fence lines and fills in foundation plantings along large barren walls.

Viburnum Summer Snowflake is a natural for shrub borders and island planting. It is a perfect candidate for English cottage gardens or American country and colonial style landscapes. It is an exceptional choice for all white and moon gardens and a natural addition to wildlife gardens.

Summer Snowflake viburnum covers itself with lacy white flowers in spring.  And it continue to bloom off and on throughout the summer.  Repeat blooming is a relatively rare trait within the viburnum genus.  We grow several Summer Snowflake viburnums in the Linnaeus Teaching Garden .  They more than hold their own against lots of stiff competition.

Location:  Fountain Garden and other locations (2018)



Vitex is a deciduous large shrub or small tree with distinctive palmately compound leaves. Profuse spikes of lavender flowers, blooming heavily in the early summer, and then sporadically throughout the summer and fall. Vitex is heat, drought and pest tolerant.  If the plant is pruned heavily after blooming, Vitex will become a small tree quickly.

This tree is also known as Mexican lavender, monk’s pepper, lilac chaste tree, hemp tree, sage tree, or Indian spice. It is a native of China and India, although long ago it became naturalized throughout certain areas of the United Stated. Records indicate that Vitex has been cultivated in the U.S. since 1670.

For people living in the warmer parts of the South, the lilac chaste tree has been the shrub or small-flowering tree of choice to mimic the much beloved lilacs that are restricted to cooler regions. It grows best when planted in full sun and in a location that drains well. It will grow well in all areas of Texas, in both acid and alkaline soils. It prospers in hot and dry environments. The Texas Department of Transportation recognizes its toughness, and plants Vitex in highway medians. It is a spectacular butterfly-attracting plant and is deer resistant in that deer will not eat it, although they can damage it with their antlers if it is allowed to grow very large.

Location: Butterfly Garden (2018)




Weigela, April

Weigela, April

Weigela’s marvelous display of pink flowers will truly draw your attention. Weigela is known for its distinctly dazzling early flowers that hummingbirds adore. The most common flower colors are red and pink.

One of the best features of Weigela is that it is user friendly. Adaptable to many soil types, it is hardy to zone 4 and has no serious pest problems. It is easy to propagate, easy to grow and presents itself well in a container. The only requirement of this plant is that it needs full sun to produce copious flowers.

Location:  Boulder Garden (2017)


Whitewater Speedwell

Whitewater Speedwell is a delightful groundcover, forming a dense low carpet covered with dainty white flowers in spring and then in waves until frost. As weather cools, the glossy, deep green foliage takes on rich shades of bronze and burgundy, remaining evergreen in mild winter areas. Deer and rabbit resistant.


Location: Butterfly Garden (2018)


Vinca, Dwarf Variegated


Vinca Dwarf, commonly known as vinca or periwinkle, is one of the most popular and widely used ground covers. Trailing stems with smooth, evergreen leaves (to 1.5″ long) root at the nodes as they go along the ground and quickly spread to form an attractive ground cover. Tubular, lavender blue, phlox-like flowers (to 1 inch across) appear in the leaf axils in spring and continue to flower intermittently throughout summer into fall. Foliage will mound up to 6″ tall. Also commonly called minor periwinkle and creeping myrtle.

Genus name is from Latin meaning to bind or wind around in reference to the long, flexible stems that were used in wreath making. Specific epithet means smaller. The leaves of Dwarf Vinca are smaller than those of Vinca major.

Location: Entry Garden (2018)


Yellow Bells, ‘Esperanza

In the Tulsa area, Yellow Bells ‘Esperanza‘ is considered an annual. However, if planted in a container, it can survive the winter by moving it into warmer winter quarters. The striking, tubular, 2 1/2-inch bright yellow flowers are highlighted by the attractive, shiny, green foliage and continue through the heat of the summer. The flowers have an odd but pleasing fragrance and also provide nectar for bees.

Location:  in a container near the Greenhouse (2015)

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