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Category Archives: Horticultural Info

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The Pause That Refreshes – Gardening in The Winter

The Garden Artist Posted on February 24, 2013 by Mary AhernFebruary 24, 2013

My thermostat read 10° last night so when it’s that cold I tend to warm myself by planning what I will be doing this coming year in my garden. It is the calm before the storm.

ahern-winter-dsc01875

I like to read so with a hot cup of coffee and sometimes a blanket over my lap I settle down to a good book of how others tend their gardens seeking inspiration and camaraderie. I read new books but often I like to reread those of old friends I have in my library. Christopher Lloyd’s “The Well-Tempered Garden” is a perennial (hee hee) favorite. Other authors are: Dominique Browning, Joe Eck, Nancy Goodwin, Allen Lacy, Fred McGourty, Henry Mitchell and Vita Sackville-West.

For more technical information and garden planning I read Michael Dirr for woody plants and Allan Armitage for perennials. If you’d like to replant a garden with a more natural look I read the work of Piet Oudolf, the Dutch plantsman.

Reading Garden Blogs online are a path to many hours spent without realizing that spring is around the corner or dinner needs planning. I read a few regularly.

Garden Rant is written by 5 different authors and covers amazing amounts of gardening, history and controversy.

Try them at: http://gardenrant.com.

To give myself some ideas and recipes, I always turn to my favorite gardening blog written by Margaret Roach, A Way To Garden. Formerly a Newsday garden writer and the garden editor for Martha Stewart Living, Margaret has, among other wonderful advice, a monthly chore list, which is written for where she lives and gardens in zone 5. This is colder and therefore sometimes slightly later than we are here in our toasty zone 7.

You can find this gem at http://awaytogarden.com.

I was going to list all the various sources for gardening catalogs that will take over your budget and common sense but I’ll just post here Margaret Roach’s resource page, which says it all.

http://awaytogarden.com/resource-link

ahern-winterdsc01874

Sit down, take a deep breath, rest, relax and learn, since before you know it we’ll be out digging holes again!

Losing my Patience with Impatiens

The Garden Artist Posted on October 1, 2012 by Mary AhernAugust 2, 2018
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
Posted in Horticultural Info, Plants | Tagged Flowers, Gardening, Horticulture, Plant Maintenance

The Joys of Gardening in the Shade

The Garden Artist Posted on June 1, 2012 by Mary AhernAugust 2, 2018

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.

Posted in Horticultural Info, My Garden, Plants | Tagged Azaleas, Design, Flowers, Garden Design, Garden Ornaments, Garden Projects, Gardening, Ground Cover, Horticulture, Musings, My Garden, Plant Maintenance, Shrubs, Trees, Woody Plants

Planning For Next Year’s Fall Garden

The Garden Artist Posted on October 5, 2011 by Mary AhernDecember 14, 2011

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.

Posted in Garden Design, Horticultural Info, My Garden, Plants | Tagged Flowers, Garden Design, Garden Projects, Gardening, Horticulture, My Garden

Deadheading Rhododendrons

The Garden Artist Posted on November 9, 2010 by Mary AhernNovember 30, 2011

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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Posted in Horticultural Info, My Garden, Plants | Tagged Gardening, Horticulture, Plant Maintenance, Shrubs, Woody Plants

Notched Leaves on Rhododendrons

The Garden Artist Posted on November 9, 2010 by Mary AhernNovember 10, 2010

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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Posted in Horticultural Info, My Garden, Plants | Tagged Gardening, Horticulture, Plant Maintenance, Shrubs, Woody Plants

Rhododendron and Azalea Cultural Information

The Garden Artist Posted on November 9, 2010 by Mary AhernNovember 9, 2010

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.

Posted in Horticultural Info, My Garden, Plants | Tagged Gardening, Horticulture, Plant Maintenance, Shrubs, Winter, Woody Plants

Rhododendrons and Azaleas Classification & Differences

The Garden Artist Posted on November 8, 2010 by Mary AhernNovember 9, 2010

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
Posted in Horticultural Info, My Garden, Plants | Tagged Gardening, Horticulture, Shrubs, Woody Plants

Rhododendrons and Azaleas- Classification

The Garden Artist Posted on November 8, 2010 by Mary AhernNovember 9, 2010

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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Posted in Horticultural Info, My Garden, Plants | Tagged Gardening, Horticulture, Shrubs, Woody Plants

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