Category Archives: Plants

Color Combinations in the Garden

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Acer palmatum ‘Dissectum’ & Azaleas in bloom in the garden of the Artist, Mary Ahern

Acer palmatum ‘Dissectum’ & Azaleas in bloom

I am an Artist so color, texture, scale, focal points and other factors drive much of my garden design. My son gave this Japanese Maple, Acer palmatum ‘Dissectum’ to me many years ago. Not knowing the eventual size of the tree I placed it right by the deck where I would be able to enjoy the delicate filigreed leaves all summer.

For a few short weeks in May this wonderful, almost stage setting display of cool pink azaleas blooms as a backdrop to set off the wine colored purple leaves of the maple. The azaleas were already on the property in this location when I bought the property in 1989 though they have certainly grown and expanded.

Lysimachia nummularia ‘Aurea’ or commonly known as Creeping Jenny with dandelion in the garden of the Artist, Mary Ahern.

Lysimachia nummularia ‘Aurea’ or commonly known as Creeping Jenny with dandelion

As a ground cover underneath the mounding maple, I planted Lysimachia nummularia ‘Aurea’, commonly known as Creeping Jenny. The bright, almost chartreuse yellow offsets and lightens the ground underneath the purple leaves of the maple lightening an otherwise potentially dark corner. Happily, both the maple and the nummularia retain their vibrant colors the entire summer.

I would like to take credit for the whimsical placement of the dandelions in front of the maple but alas, that was the creative idea of Mother Nature.

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Adding a Tree to my Garden

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In October of 2012, Superstorm Sandy felled 4 large Oak trees in my woodland garden. We were lucky that was the only damage we suffered in that severe storm other than loss of electricity. Instantly my garden went from full shade to sunshine a dappled shade. What a transformation for it and for me.

Oak tree lost in battle with Hurricane Sandy

Oak tree lost in battle with Hurricane Sandy

After a period of mourning, I started rethinking, planning and studying what to do with this newfound daylight.

One of the mighty Oak trees was left with an interesting sculptural remnant which I originally planned to keep in remembrance of what had been. As usual, I changed my mind as I started designing and replanting. Like most gardeners, I change my mind all the time as I work in my garden.

I decided to plant a Heritage River Birch, Betula nigra “Heritage” in memory of my Uncle Teddy who introduced me to gardening. As a child visiting him in Schenectady from my treeless home in Brooklyn, he one day found me peeling the bark from one of his many white birch trees. When he asked me to stop as I was pulling the “skin” from the tree and hurting it, I looked around with tears in my eyes and realized that the entire garden was alive. I was transformed!

1940's-WWII-Theodore-Gerrits

Theodorus Hendrik Gerrits, 1914 – 1991. Thank you!

 

This tree is for my uncle who shared with me his garden and his love. Thank you!

2014-Uncle-Teddy-birch-tree-IMG_6821

 

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Rethinking My Garden

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For the past 25 years I’ve cultivated my woodland gardens. For the first decade I cleared the tangled woods, studied the indigenous plants, planned paths and materials. I worked on creating a natural looking shade garden focusing on the large oak trees and Kalmia that inhabited this spot of land before I showed up.

A lot of thinking and sweat went into this garden. I selected what shrub trees, like the untold numbers of small cherries, that needed to be removed. Purged, or shall I say, paid someone to purge the thick growths of poison ivy. Fought and pulled, yanked and grunted bales and bales of ivy from the trees and ground in a continuing war for dominance.

When the bones were clear I began to plant. The lists of shade tolerant shrubs and perennials read like a who’s who of my garden. Mistakes were made. Shade is not shade. Lessons learned. Successes were savored. Learning that gardening in shade reduces the need for weeding, plus you perspire less. Perfect!

Oak tree lost in battle with Hurricane Sandy

Oak tree lost in battle with Hurricane Sandy

But Sandy decided she knew better and redesigned my garden. She blew in and knocked down three large oak trees and a beech thereby instantly transforming my beloved woodland shade garden into a sun-splashed mecca. Thousands of weeds instantly rejoiced by dancing in the new sunshine, prancing in the beds and mulched walkways. Ivy rebounded with a vengeance of superiority, eyeing triumph. Scores of broken and battered kalmia, enkianthus, leucothoe, rhodi’s, azaleas, viburnum, hammemelis,  and andromeda wept.

And now?? Lessons begin again.

Looking for low-maintenance in the sunshine? Remembering our club trip to the Highline designed by Piet Oudorf, my Dutch hero, I’m creating new plant lists with sunshine in mind to cover the time for my new gingko to grow and spread. Shade my grandson will perhaps enjoy in case I miss it.

Amsonia, salvia, achillea, aster, coreopsis, Echinacea, eremurus, liriope, persicaria, rudbeckia, sedum, helianthus, and grasses, yes many textures and heights of grasses. I’m excited now that my period of mourning has passed. Excited by all the new possibilities in the sunshine.

 

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Hellebore Botany – Which Stage is Acceptable For Flower Show Judging

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The question was posed as to why some Hellebore’s can be entered into Flower Show judging and others are rejected. Here’s the long answer.

Understanding the botany of the Hellebore will help explain the answer to the Flower Show suitability.

The attraction and colors of the Hellebore, Figure #1, are not supplied by petals but rather sepals. Petals are usually lost after a flower is fertilized but sepals and bracts don’t suffer the same fate and are persistent

Botany of a Hellebore

Fig. 1. Diagram of the botanical parts of a Hellebore flower. Photo courtesy of Monica Tehomolic.

Sepals (A) normally form outside of petals as a protection and support of the bud and flower. There are usually 5 sepals, two outer, two inner and one both. A group of sepals is called a calyx.

The stamens (B) are the male part of the flower and are made up of 2 parts, the long white filament and the anther that sits on top holding the pollen. There can be up to 150 stamens per flower.

The stamens surround the female part of the flower, the carpel (C). Fertilization of the carpels can be by insects, bees or wind.

Replacing the petal in the case of Hellebores are small nectaries (D) that sit at the base of the sepals and provide food for pollinators. They don’t last very long and are shed at the same time as the stamens when the carpels swell with what will become seeds.

Fertilized Hellebores can seem attractive for quite a long time since the sepals are persistent and the swollen carpels (E) are distinctive. The sepals will tend to loose their color vibrancy over time however.

Because the Hellebore in Figure #2 is a fertilized flower, even though the sepals still appear fresh, this is not the stage when it is an acceptable specimen in a formal Flower Show submission.

So, the short answer to the question of whether the Hellebore in Figure #2 is acceptable for Flower Show judging is: No, since the center is a fertilized seed pod.

Hellebore botany

Fig. 2. Fertilized Hellebore. Photo courtesy of Monica Tehomolic

Hurricane Sandy Stole Some of My Tree Friends

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I lost some friends.

Sandy came to visit and in a fury broke, smashed and tore away some of my garden friends. These huge and venerable trees were here before I moved into their space many decades ago. They’ve provided me with the backbones of my woodland garden. They helped me design the paths I carved out of the thickets. They offered the strong verticals of a towering garden design.

These old oaks shared their shade keeping me cool in the summer. This shade offered me the opportunity to explore the great variety of plants and shrubs that thrive in their speckled light. Shredded oak leaves of these generous trees have been the basis of the garden mulch that nourishes my woodland garden.

I am mourning the loss of what was.

But now I’ve planted bulbs where the oaks once stood.

I look forward in the spring to enjoying their sunshine.

Hurricane Sandy Tree Damage

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Losing my Patience with Impatiens

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Photos courtesy of Margery Daughtrey of Cornell Cooperative Ext of Suffolk County NY.

Early symptoms of leaf chlorosis and curling.
Photos courtesy of Margery Daughtrey of Cornell Cooperative Ext of Suffolk County NY.

The backbone of the shade gardener’s summer display has been Impatiens for as long as I’ve been gardening (which is longer than I’ll post in a public forum.  But that long starring role has come to an abrupt halt this year (2012) due to the infamous, Downy mildew fungal like disease caused by the pathogen, Plasmopara obducens. The symptoms caused millions of gardeners to drag out their hoses in attempts to combat the disease, which mimicked the appearance of water starved plants.

 

Leaf drop symptoms on Impatiens walleriana caused by Plasmopara obducens or Downy Mildew. Photo courtesy of Margery Daughtrey of Cornell Cooperative Ext of Suffolk County NY

Leaf drop symptoms on Impatiens walleriana caused by Plasmopara obducens or Downy Mildew. Photo courtesy of Margery Daughtrey of Cornell Cooperative Ext of Suffolk County N

This tremendous shake-up in the Horticultural industry has growers, breeders and chemists scrambling for solutions and workarounds. It isaffecting this billion dollar industry in big and small ways at a time when our economy is struggling. The gardener goes to the nursery to place part of their closely budgeted money to bring a season of color and happiness to their home.  The nursery is in a seasonally based business & feels the pressure of cultivating new customers into the Art of gardening as well as taking care of their established base of avid buyers.

 

Under competitive pressure these nurseries offer their customers plant warranties. It boggles the mind how a seasonal small business would be able to sustain themselves when a calamity like the collapse of the stalwart impatiens plants would affect their bottom line once the warranties start rolling in.

One of the largest growers and breeders of Impatiens is right here on Long Island.  Ivy Acres, located in Baiting Hollow, supplies a customer base not only on Long Island but also in New Jersey, Westchester County & Southwestern CT. They are the suppliers to the wholesale nurseries, so the chain of businesses affected continues up the chain of distribution.

What does that mean for us, the local gardener? What that means is that there is immense pressure to bring to market disease resistant replacements for the annual market geared to shade tolerant plants. For the next few years we will be seeing a tremendous array of new opportunities and options as replacement plants are introduced into the Horticultural market stream.

According to Mark Viette on his Sunday morning WOR radio show some suggested replacements for our dearly departed Impatiens walleriana at the moment are:

  • New Guinea Impatiens
  • Coleus
  • Begonias
  • Torenia
  • Browalia
  • Lobelia
  • Scavola
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The Joys of Gardening in the Shade

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So now, after an unusually warm & snow-free winter, the weather has already skimmed the high ’80’s during the month of May. As I sit on my deck exhausted from the heat, wondering how I’m ever going to be able to do all my planting after I’ve indulged at our plant sale & exchanged plant trophies with my gardening girlfriends.

The good news is that I’m a shade gardener. (That’s not to be confused with a shady gardener.) If I play my cards right I never have to bow down in the bright sun, slather myself in sunblock, or supply myself with a straw hat. The sun, which in my youth was my friend, now entices me only from sheltered nooks.

I garden in full shade, dappled shade, high shade, mostly shade & some minimal shade. Because shade is an elusive distinction, my garden is a type of laboratory. Often I’ll divide a plant in order to test the shade tolerances of specific species or cultivars. I document my garden with extensive photos & data as part of my enjoyment of the Art of gardening.

Shade gardens are about subtleties. Textures of leaves, the size & scale of those leaves, the shiny leaves versus those with indumentation, rough to the touch or smooth as suede. Color in the shade is not blinded out by the harsh sunshine. One can appreciate the varieties of green, the blue-greens, the lime-greens, the purple-greens & how about green-green. The color of an emerging stem or bud versus that in its maturity is quite an event to observe in the shade garden.

My shade garden is zen-like for me. It’s about savoring the space, the sounds of the birds singing for their supper, the smell of the soil on moist mornings, the wandering on my woodland walks.

Oh, and one final thing, because of the shade there is very little weeding to be done. Sweet!

Woodland walkways with Ginkgo bench the inspiration for the artist, Mary Ahern.

Woodland walkways with Ginkgo bench in the distance.

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Winter Interest

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My garden doesn’t go into the winter season all tidy & neat. I enjoy seeing seed heads popping through the snow. The visual treat of shadows cast about by the wind, dancing along the walls seen from the windows of my warm home.

From my dining room window, the seed heads of tall grasses are seen swaying in the breeze with the floodlight of the pure winter sun behind them.

From the kitchen window the afternoon sun gleams through the slivers of peeling bark of the Acer griseum, wisely named Paperbark Maple. Tissue thin decorations provided by nature.

What a joy to watch teensy birds land on the seed stalks of last summer’s Echinacea, barely bending them. My winter garden provides them a smorgasbord of treats so they keep coming back for more. We have an agreement.

The evergreen stalwarts of my woodland garden, the hellebores & Polystichum acrostichoides (what a fabulous name for a Christmas fern), help to delineate the pathways once the snow has fallen. They’re markers keeping me on the right track. I need that help quite often.

The hellebores serve another important service. They are the harbingers of spring. As I enjoy the subtle visual treats of winter I can’t help but poke underneath their large leaves seeking hungrily the buds signaling the beginnings of a new season of visual excitement.

Chasmanthium latifolium. Northern Sea Oats gracing my winter garden

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Planning For Next Year’s Fall Garden

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One of the ways I plan for next year’s garden is to take a look around, make notes & gather ideas from other gardens. This is particularly helpful in planning the fall garden.

I look for what plants have continued to hold their own & still look beautiful into this time of year. I avoid looking for suggestions at the nurseries & gardening centers because those plants have been coddled, fed, trained, trimmed & produced specifically to entice you to buy them as your own garden fades.

Instead, I look at the gardens of my friends. Which plants are in bloom & in which colors? Which have stood the ravages of a long season of pests, fungus & weather to still look stunning? Which plants have resisted the need for staking & other high maintenance gardening chores?

Here are a few of the choices you’ll find in the fall garden:

Chelone lyonii 'Hot Lips'

Chelone lyonii 'Hot Lips'

Chelone lyonii ‘Hot Lips’

Turtlehead

This cultivar is a bit shorter than the Chelone oblique & the pink color a bit brighter. It needs no staking & reliably blooms for weeks on end. The dried heads look stunning in the winter sun as they’re popping up through the snow.

Angelica gigas

Angelica is a sturdy biennial, which reseeds conservatively in the mixed border.

This chest high specimen blooms on tall stalks with purple broccoli like flowers adorning them for weeks on end. Just be careful not to lose them by being to earnest in your springtime weeding or you’ll miss out on this fall wonder.

Kirengeshoma palmata

Kirengeshoma palmata

Kirengeshoma palmata

This 4’ tall and 4’ wide no maintenance fall blooming plant sports pearl like buds of yellow flowers in the shade garden. No staking, no pruning, no pests. Just sturdy, reliable performance.

Call your friends. Visit your neighbors. See what’s blooming in their gardens as you plan for next year’s fall extravaganza.

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Deadheading Rhododendrons

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Why?

Deadheading the spent flowers on a rhododendron tends to focus the energy of the plant towards new flower production and general plant health. It also improves the sight of the plant when not in bloom.

How?

To deadhead, use your fingers and gently rock the base of the spent flower truss back and forth until it separates from the plant. That’s it. Now you can either toss the spent bloom under the shrub for mulch or discard on the compost heap. Your fingers might get a bit sticky from the residue but that’s part of the fun of gardening.

When?

I tend to deadhead my rhodi’s in the evening after I’ve worked all day in the garden and I’m strolling around to admire my work. I usually stop when it gets dark and that’s how I know it’s dinner time.

deadheading rhododendrons
After the blooms are spent it is beneficial to deadhead your rhododendron

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Notched Leaves on Rhododendrons

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NOTCHED LEAVES ARE CAUSED BY WEEVILS

Notched leaves on your rhododendrons are caused by a variety of species of weevils. The adult forms of the weevil tend to feed at night during the springtime when you’re resting after a hard day in the garden. The damage will not kill your plant, just cause unsightly notching on the leaves. Of course, the leaves being evergreen will be around awhile to annoy you.

rhododendron leaf damage
These notches on the Rhododendron leaf was caused by a weevil

• Hand pluck the critters.

One method of control is to go out to your garden in the evening with your flashlight and pluck the weevils from underneath the rhodi leaves and toss them into a bucket of water. This never appealed to me.

• Spray with systemic insecticide.

Another, more toxic method is to spray with a systemic insecticide, like Orthene. Make sure to follow the instructions on the label. Soak the leaves, both top and bottom as well as the soil underneath to get the best control.

• Accept imperfection.

The third method is to allow for a measure of acceptance of the notches and let nature take its course. Your neighbors will either respect your concern for the environment or talk about your lack of concern for aesthetics.

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Rhododendron and Azalea Cultural Information

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Generally speaking, cultural requirements are less “demanding” for lepidote (small-leaf) rhododendron and azaleas, both evergreen and deciduous. They tolerate, and to some extent require, more sun than elepidotes, and azaleas will also tolerate less well-drained soil. In all other respects, the general guidelines outlined above apply to all plants in this family.

Site Selection
Rhododendrons prefer a site that provides afternoon shade, some protection from wind, good drainage and air circulation. Sloping terrain is also a decided advantage.

Soil
Well-drained soil is a must. Use raised beds to plant on top of poorly drained soils. Ideally, soil should be acid (ph 4.5 – 6.0) and high in organic matter. Pine bark, coarse sphagnum peat moss, composted wood chips and other such materials can be worked into the soil to improve organic matter content and soil drainage. Incorporate a few handfuls of super phosphate (0-20-0) in the mix to stimulate root growth.

Planting
Container plant root balls must be sufficiently disturbed so that roots extend out from the ball. The planting hole should be wide but shallow. Loosen and amend soil only 8 – 10 ” deep so that the root ball sits on solid ground to prevent sinking. Plant only as deep as the top of the root ball with no soil on top of the ball. Do not pack soil tightly around the plant, as tender roots will be destroyed. Mulch 3″ deep and water thoroughly.

Rhododenron planting diagram
Rhododendron Planting Diagram

Mulching
Mulch with 3″ of pine bark, pine needles, oak leaves, composted wood chips or other loose airy material. Do not use maple leaves, grass clippings or other materials that pack down.

mulch
Loading mulch for placing under shrubs

Fertilizing
If plants hold good green color and grow well, no fertilizer is needed. Rhododendrons are not heavy “feeders”. A soil test can determine what elements are deficient if plants do not perform well. When necessary, apply a fertilizer formulated for acid loving plants in late winter or early spring. Don’t fertilize after June 1st.

Watering
Proper watering is an important after care practice, especially for the first several years as plants become established. Keep the soil moist but not wet. Water deeply, (apply 1″) in the absence of equivalent rainfall. Don’t water again until the soil starts to dry out. Afternoon wilting of new growth is normal. If leaves become turgid a few hours after sundown, no additional water is needed. Water requirements diminish in late summer and early fall as new growth hardens up for winter. Plants should, however, be watered going into winter following a dry fall.

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Rhododendrons and Azaleas Classification & Differences

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This is part of an outline of a ten minute talk I gave to the Centerport Garden Club on November 9, 2010

HOW ARE RHODODENDRONS CLASSIFIED?

Rhododendrons are classified into two major groups, lepidote and elepidote?

  • Elepidotes are large leaved rhododendrons. They are the type of shrub that most individuals would associate as being a rhododendron. They do not have scales located on the underside of the leaves. Plants tend to be very large in their maturity.

    elipidote rhododendron

    Elipidote Rhododendrons have big leaves

  • Lepidote rhododendrons have smaller leaves and are usually low growing or dwarfs. They usually bloom earlier in the spring than the larger leaved elepidotes.

    lepidote rhododendron
    Lepidote Rhododendrons have small leaves

WHAT IS THE DIFFERENCE BETWEEN AZALEAS AND RHODODENDRONS?

rhododendron
Rhododendrons have 10 stamens, 2 per lobe

  • All azaleas are rhododendrons but not all rhododendrons are azaleas.
  • True rhododendrons have 10 or more stamens which is 2 per lobe. Azaleas usually have 5 stamens or 1 per lobe. Azaleas have 5 lobes in a flower
  • Azaleas tend to have appressed hairs which are hair parallel to the surface of the leaf. This is particularly true along the midrib on the underside of the leaf. It is easily seen in “evergreen” azaleas.
  • True rhododendrons instead of hair are often scaly or have small dots on the under side of the leaf.
  • Azalea leaves are never dotted with scales and are frequently pubescent.
  • Many azaleas are deciduous.
  • True rhodi’s are usually evergreen with the exceptions of R. mucronulatum and R. dauricum.
  • Azaleas have tubular funnel or funnel shaped flowers. Rhodi flowers tend to be bell-shaped.
    azalea
    Azaleas have 5 stamens, one per lobe
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Rhododendrons and Azaleas- Classification

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This is an outline of a ten minute talk I gave to the Centerport Garden Club on November 9, 2010

Botanical Classification

Rhododendrons and azaleas belong to the genus Rhododendron of the heath family (Ericaceae).

  • The heath family includes the heaths and heathers, blueberries, mountain laurels and several other ornamental plant groups.  Most members of this family require acid soil and good drainage.

Rhododendron collectionThis is a selection of the Rhododendrons submitted to the judging of the Spring Flower Show at the NY Chapter of the American Rhododendron Society at Planting Fields Arboretum

Where are Rhododendron’s from?

Some are native to the US.

The British became the first explorers to seek out new additions.

Collecting has brought plants, seeds & cuttings from Japan, China & the Himalayas.

New species are still being collected in central China.

In the 1800’s they were so expensive & were considered a rich person’s plant. They appeared on estates and in arboretums.

Most of the Rhodi’s we know today are hybrids created from the parents of the plants collected by these plant explorers.

Azalea gardenAzaleas blooming in May in my garden in Northport NY

Common Types

  • Large leaf evergreen Rhodi’s: Great for screening and as a backdrop behind the flower garden, Catawbiense, English Roseum, Scintillation, Maximum
  • Small leaf evergreen Rhodi’s: some sport beautiful mahogany leaves during the winter months, Aglo, Dora Amateus, Mary Fleming, the PJM’s
  • Yakushimanum hybrids: usually 3’wx3’h with woolly indumentum on dark green leaves. Have wonderful winter interest, Crete, Fantastica, Ken Janek, Percy Wiseman, Prince & Princess
  • Species Rhododendrons, can present well in a mixed flower, shrub border. There is a species rhododendron garden in DC.
  • Azaleas-Evergreen: Michael Dirr begins his Azalea Cultivar & Hybrid Group section with:

“In some respects, it is paralyzingly frightening to attempt to present the cultivars of azaleas.”

There are so many but you can begin to study them realizing that some are named for their hybridizers: i.e. Girard Hybrids, Glen Dale Hybrids, Polly Hill’s North Tisbury Hybrids. Others by their location: i.e. Linwood Hybrids, Karume Hybrids of Japan.

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First Flowers of the Decade

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I know I’m suffering from a pretty awful case of cabin fever. So last Friday, January 22 my Hogging buddy, Elisabeth and I spent a wonderful day at the New York Botanical Gardens in the Bronx, NY.

Snowdrops are put on this planet to bring a smile to your face in winter
Snowdrops are put on this planet to bring a smile to your face in winter

Galanthus elwesii in bloom in the Jane Watson Irwin Perennial Garden, NYBG
Galanthus elwesii in bloom in the Jane Watson Irwin Perennial Garden, NYBG

Walking through the Jane Watson Irwin Perennial Gardens on the way to the Conservatory, what do we see but the heralding of spring. The Galanthus elwesii and Helleborus niger were in bloom. Right out there, smack in the cold misery of January.

If you need a boost to get you through the next few weeks, seeing these in bloom is just the ticket.

Hellebore niger were in bloom as were the less showy Hellebore foetidus
Hellebore niger were in bloom as were the less showy Hellebore foetidus

In my own garden I have many cultivars of Hellebore but no Christmas roses
In my own garden I have many cultivars of Hellebore but no Christmas roses

Check your own gardens for what buds are beginning to swell and whether your daffodils are starting to push through the mulch.  When I came home from the NYBG I did just that and found a whole host of growth going on right outside my windows.

Yippee!

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