Archive for Plants I Recommend

Modern Landscape Design Plants for Portland

Modern Landscape Design Plants for Portland

As a Portland landscape designer I enjoy helping clients who want modern landscape design plants.

While well crafted hardscape is the key element to a successful modern style landscape, plant selection and how they are used is critical.

Here are a few things I keep in mind.  Balanced plant repetition, contrasting textures and overall shapes of plants, full season interest plantings, and low maintenance plants.  Keep in mind that the typical plants for modern style are not great for wildlife because they lack diversity.  My designs consider the clients many unique interests. A modern style design can have wildlife friendly plants included.

Here are 10 plants that work well for modern landscape design and are fairly easy to find.

Modern Landscape Design PortlandNarrow Vertical Plants

Japanese Holly ‘Sky Pencil’ – Ilex crenata (pictured)

Italian Cypress ‘Tiny Towers’ – Cupressus semptervirens

Italian Cypress ‘Swane’s Golden’ – Cupressus sempervirens

Portland Landscape Designer likes Black Mondo GrassLow Edger Plants

Black Mondo grass   –  Ophiopogon planiscapus ‘Nigrescens’

Green Japanese Mondo grass  –  Ophiopogon japonicus

Cushion Bolax – Azorella trifurcata ‘Nana’ (Stepable Groundcover)

Hens and Chicks – Sempervivum

Other Grasses and Shrubs

Grama Grass ‘ Blonde Ambition‘ – Boutelous gracilis

American Switch Grass ‘ Shenendoah’ – Panicum virgatum

Nandina D. ‘Firepower’ – Nandina domestica (dwarf form)

Hebe (prostrate form) – Hebe Albicans ‘Sussex Carpet’  

 

Violet Blue Flowers in Your Summer Garden

Violet blue flowers in your summer garden

There is something magical about violet blue flowers in a summer garden. A mass of long flowering intense violet, purple or blue flowers to see from your summer chaise is a joy. Here is a plant that I use in my garden designs that is easy care and long flowering.

Blue False Indigo – Baptista Australis ‘Purple Smoke’ is a long lived perennial so it will live for decades in your landscape. I use it in my landscape designs because it is colorful, low maintenance, fully drought tolerant, and long blooming. It has attractive foliage and interesting seed pods for fall. Clients who want color and easy care would line up for this plant if they knew about it. It looks great with ornamental grasses and has a more naturalistic look since it is related to lupine, a classic native wildflower.

Planting combinations for Portland Landscape Designs

I’ve used it in a low water parking strip in NE Portland with true dwarf pine, succulents like Sedum spurium ‘Green Mantle’, heather and black mondo grass.  In a SW Portland Landscape design I placed it to tower over a low boulder with plant companion ‘Kim’s Knee Hi’ Echinacea to the side.

Over time the plant will increase to a nice thick stand of charcoal green stems (which add to the beauty) and violet blue flower stalks.  ‘Purple Smoke’ is grown locally, other varieties and flower colors are only available by mail order.  I only use the  variety of Baptista Australis called ‘Purple Smoke’.  Don’t use the parent plant of  ‘Purple Smoke’, it is called just plain old Baptista Australis and gets too tall for most city gardens.

Plant uses

The primary use is ornamental and wildlife friendly. It’s not edible although it is a legume but it is not toxic. It’s a true native American plant.  North American Indians had many uses for this plant.  The Cherokee made a blue dye for fabric from the flowers.  The Osage made some kind of eye wash.  Others used the roots as an antiseptic for wounds.  It is not considered edible and was once thought to be highly toxic.  Modern research has changed this perception.  Read more about the plants chemistry.

How to kill Baptista: Water it every day in the summer and fertilize it heavily. Plant it in a low spot where winter rain water will puddle or sit.

Best practice:  Water deeply once a week the first summer.  The second summer water deeply but infrequently or put a plug in the drip emitter because it won’t need any water by the third summer.  I always place it with low water plants so it is easy to provide it with low water to no water. Don’t divide it. It has a tap root so dividing will kill the plant. If the clump gets too wide, take off new plants at the edge of the clump.

After the foliage yellows in the fall cut it down to the ground.  Mulch twice a year with garden compost.

Check out my Summer Watering Tips. Learning how to water properly can be a great stress reducer for you and protect your landscape investment.

 

Portland Landscape Designer loves Purple Flowers

Portland Landscape Designer uses Purple Monkshood in Eastmoreland Garden

Monkshood with Japanese Forest Grass and Hardy Fuchsia

Portland Landscape Designer loves purple flowers of Monkshood

Portland landscape designer loves purple flowers of Monkshood.  My clients have unique likes and dislikes when it comes to plants.  When they love something specific, like purple flowers, one of my favorites is purple flowered Monkshood.  Other clients are focused on a purpose such as native plants or the lowest of low maintenance plants and not on specific colors.  My job is to find the plant palette that satisfies each client’s needs.

Purple flowers

I love tall columns of  purple flowers in my Portland landscape designs.  I often use them at the back of  planting beds to break up a bare wall or visually soften a fence. It’s an easy care perennial plant with no pest problems. It flowers a long time, provides great contrast with bright green or gold foliage and adds drama to the garden scene.

Aconitum 'Tall Blue' Portland Landscape Designer plant

Aconitum Carmichaelii ‘Tall Blue’ – Monkshood at Joy Creek Nursery

I only use varieties that don’t flop.  There is no need to stake the plants if you select the right varieties and water correctly. Staking plants is a hassle and not low maintenance so I don’t use plants that require staking in my designs.

Here are the Monkshood varieties I use in my Portland landscape designer practice.

Aconitim x napellus ‘Newry Blue’ -Flowers June and July, 4′ tall and an intense purple blue

Aconitum carmichaelii ‘Tall Blue’ – Flowers late August and September at 6′ to 8′

Portland Landscape Designer loves purple flowers of Monkshood

Aconitum Carmichaelii ‘Late Crop’ – Monkshood at Joy Creek

Aconitim x napellus 'Newry Blue' - Monkshood 'Newry Blue'

Aconitim x napellus ‘Newry Blue’ – Monkshood

Aconitum carmichaelii  ‘Late Crop’- Flowers into October, is a dark rich purple at 5′ to 6′ tall

Monkshood was used for poisoned arrows

This plant has a checkered past.  In medieval times Monkshood was also called Wolfbane and was the source for poisoned arrows.  Applied to a cut, Monkshood can be deadly and all parts of the plant are toxic.  Yet in modern times it is commonly used by florists and sold by garden centers and nurseries.  In 25 years I have no first hand knowledge of anyone being poisoned by monkshood but I don’t use it in my Portland landscape designs for young families or in parking strips.

How to kill this plant: 

Plant it in full sun and never water it, (or just as bad) water every day in the summer.  Plant in a low place where winter water will soak the roots for days at a time.

Best practice:

Most resources say part shade but I have found they thrive in half day sun to nearly full day sun with a few hours of dappled or light shade. Deeply irrigate Monkshood in full sun and less in part shade.  In time most Monkshood will become low water needs.   In too much shade it will flop and will not have as many flowers. Plant in well-draining soil, water established plants deeply once a week.  Don’t fertilize beyond adding a  compost or mulch around the crown twice a year.  Fertilizer may cause the plant to grow too lushly and make the stems flop. Cut it back to the ground in winter or when the leaves have gone yellow.  Learning how to water properly  creates confidence and makes maintaining your landscape less stressful.

 

 

Native Plants for Small City Landscapes

Native Plants for Small City Landscapes

NW Native plant Sword fern

NW native plant Sword fern can be planted in less than ideal soil with good results.

People dream of a landscape that will need no watering.  Sometimes because they think it will be less work but more likely these days they recognize that water or the lack of it is a problem that will continue to grow.  Like the Brits in World War II they want to do their bit to help with a very real problem.

One way to have a no water landscape is to use NW native plants.  Here are some tips to help you have more success.

What size of plants to plant

They will establish better with a bigger root ball.  Expect 15 to 20 percent of your plants to fail.  Try not to take it personally.  Natives are a little more particular than other plants.  Use 2 gallon sized plants not 4 inch or 1 gallon for best results with native plants like Salal-Gaultheria shallon, Ocean Spray-Holodiscus discolor, Huckleberry-Vaccinium ovatum, Current-Ribes sanguineum or the favorite native of all, Vine Maple-Acer circinatum.

Sword fern can be smaller

If you are planting Sword fern Polystichum munitum, save your money and buy smaller plants, like a 1 gallon.  Sword fern can also be planted in less than ideal soil with good results.  It’s the only NW native plant that doesn’t need careful soil preparation.  I’ve transplanted it from my woods and had it play dead for over one full year.  It came up the second year and was back to a three foot wide fern by the third year.  Fascinating.  This plant can be killed but one would have to work at it.  It can tolerate summer water and will look more attractive watered when planted in a sunny area.  In shady areas it has looked quite attractive without a drop of summer water by the third year.

Pacific Madrone

Pacific Madrone – Arbutus menziesii
has recently been approved for City of Portland street trees.

Madrone must be smaller

Madrone-Arbutus menziesii is perfect for a no water landscape and is very picky about how and  where it is planted.  This is because unlike most trees it has a tap root so it does not thrive in a pot for long.  In the past I’ve only successfully planted a 6 inch tall plant. Recently friends of trees has found a way to grow them to about 5′ feet tall and plant them in parking strips.  They are a needed plant for hosting rare butterflies so if this succeeds it will be very exciting. Two important tips for success with your new Madrone; water sparingly the first summer, and do not ever fertilize.  After the first summer is over, never water your Madrone again.  Don’t plant anything else within ten feet that needs summer water and don’t prune your Madrone.  It’s a beauty that requires planned neglect for success.  At this time I do not have a retail source for the larger Madrone.  If you want one, buy the 6″ size at a native plant sale.  They grow surprisingly fast.

Vine Maple with Single Trunk

Vine maple with single trunk fits small city landscapes. Multiple stemmed trees will get too wide.

Vine Maple-Acer Circinatum

The most typical mistake I see in small city landscapes is multi stem Vine maples horribly disfigured with poor pruning because they got too big. Most small city landscapes are not big enough for a multi stem or clump version of Vine maple – Acer circinatum.  Instead I select a single trunk Vine maple from one of my wholesale growers.  A single trunk tree will not get too wide.

When to plant NW native plants

Plant in fall for best results with native plants.  Planting in late winter and early spring works almost as well.  Planting in mid spring or summer will require more summer watering and some natives have an adverse reaction to summer water but their roots are not established well enough to go without water for the first summer so it’s a dilemma.

Avoid this dilemma by planting in the fall or early spring.

Native Huckleberry

Evergreen Huckleberry used as a screen in SW Portland.

Evergreen Huckleberry comes in two sizes (sort of)

Evergreen Huckleberry-Vaccinium ovatum is almost like two different plants.  Planted in a sunny area it grows slowly to 4’ tall and perhaps 3’ wide.  While it will continue to grow and get a little  bigger each year, it’s very slow growing.  Compare it with the same plant in part shade to heavily dappled shade and it grows faster and is often in  the 6 to 8 foot tall by as wide.  People use the berries in muffins, pancakes and jam.  The flavor is mild from plants in low elevations and more flavorful in higher elevations.  Birds will eat them but don’t tend to use them for baked goods.

Soil Preparation

Most NW Native plants need well prepared soil.  Some need fertile soil, some need a sandy soil but almost all of them need well drained soil.  I find most directions on how to prepare soil for NW natives quite complex.  It is doable.  If you are DIY, here is a web site that might be helpful.  http://plantnative.org/how_siteprep.htm

NW Native Flowering Current

Flowering current – Ribes sanguineum is a spring pick me up for people and nectar for hummingbirds.

How to Kill your plants

Plant too deep – Dig the hole several inches deeper than the root ball of the new plant.  Plant them in the lowest area of your property.

Water them every day their first summer.  They might live a few months but will die in their first winter even if you only over watered them in the summer.

Best Practice

Dig the hole twice as wide but only as deep as the root ball of the new plant.  Plant 1” too high and bring soil to the plant.  Water carefully the first summer.  A slow soak rather than daily light sprinkles of water is best.   Mulch the plant in the fall and spring, don’t fertilize.

Sword Fern in Sun

NW Native Sword fern – Polystichum munitum has upright fronds in sun and horizontal low fronds in shade.

Mix of NW Native Plants and Non Native Plants

As a Portland landscape designer, when I have clients who want no water landscapes, I tend to mix other plants with NW native plants.  My list for a full sun area might look like this:  Spanish lavender, dwarf Manzanita groundcovers,  Oat grass, heather, California lilac, true dwarf pines, smoke tree, madrone,  Grama grass, dwarf Fountain grasses, Rosemary, Hebe, stepables like Elfin Pink Thyme.

 

Coreopsis colorful easy low-water plantings

Tickseed - Coreopsis Bengal Tiger Photo Terra Nova Nurseries

Tickseed – Coreopsis ‘Bengal Tiger’  Photo Terra Nova Nurseries

Coreopsis colorful easy low-water plantings

As a Portland landscape designer I use Coreopsis verticillata and its’ cultivars because it’s a perfect colorful, low maintenance plant for modern landscape designs, bee friendly gardens, cottage gardens, container gardens and low-water plantings.

Clients love it because it flowers for such a long time from summer into fall.  Coreopsis is beloved.

I wrote this blog to help clients understand which Coreopsis will live for years and which ones will not.   Coreopsis verticillata is one of about five species of Coreopsis that are native to the United States.   Many people feel  that Coreopsis verticillata will grow too wide after about five years and will need to be divided.  A lot of my younger clients are so focused on low-maintenance plants that I typically don’t include any plants that need to be divided in their plans.  I still have this old-fashioned idea that I can provide a planting plan where all the plants will last 20 years and the trees forever.   However, if I really stick to that I’m shorting my busy young clients of some plants that are going to do very well for a long enough period of time. Digging up a plant every five years chopping it in half, tossing half of it or giving it away, and then re-planting half of it is less work than having  to buy a new plant.

So if you are still interested in a low maintenance easy plant that has to be divided read on.

Bee friendly flower

Coreopsis verticillata ‘Moonbeam’ is perfect for a bee friendly garden.

Another asset, Coreopsis verticillata hits its color stride after all the May and June flowers have faded in the heat.  I am still picking flowers for my bathroom posy in late September.  It’s a perfect fit for a bee friendly garden. You could start your bee feeding year with winter flowering heather, then Spanish lavender then English lavender and finish the year with Coreopsis.

I personally use Coreopsis in small bathroom bouquets. I love it’s ferny foliage texture and the strong zap of color.  But it’s a great addition to any flower arrangement.  They are so cheerful.

Here are some trustworthy choices easily available at most nurseries.

Coreopsis verticillata varieties

‘Creme Brule’ versus ‘Moonbeam’

When ‘Moonbeam’ came out in the 1990’s it was possibly the most popular perennial of all times. Nurseries could not keep it in stock. It has dark green ferny foliage while ‘Creme Brule’  has a bright emerald green ferny foliage. ‘Creme Brule’ is taller and has a soft yellow flower which is larger than ‘Moonbeam’.  The stems are stronger as well but while many claim that ‘Creme Brule’ is more mildew resistant, I have not found this to be true.   ‘Creme Brule’ tends to have flowers from the lower stems to the top which I find attractive. ‘Moonbeam’ tends to carry the flowers only at the top of the plant. ‘Moonbeam’ will be a little cheaper as it’s been around longer in the nurseries then ‘Creme Brule’. They are both great plants.

‘Zagreb’: is named for the capital of Croatia.  When you think of the trouble those people have been through and have persevered it makes sense that this plant carries that name. This plant is incredibly yellow and tough. I don’t typically recommend it because I have had problems with it reseeding and making a nuisance of its’ self in some areas.  I use it for incredibly difficult environments where having it spread won’t matter. Obviously, this would not work for small city landscapes except as a low maintenance mass planting.        

Coreopsis verticillate ‘Bengal Tiger’  Photo credit Terra Nova

‘Bengal Tiger’: select this plant for the amazing color contrast of red and gold. It is similar to a plant called ‘Route 66’.  The flowers on ‘Bengal Tiger’ will be more consistent whereas the flowers on ‘Route 66’ will be very different from each other on the same plant which some people feel looks a little muddy.

How to care for Coreopsis Verticillata

Plant in a well draining soil or up on a berm.  I’ve seen this plant do well at the edge of a lawn too.  To keep it flowering cut the plant back by half in mid summer. I have cut back ‘Moonbeam’ Coreopsis up to 3 times in one summer to keep it flowering until fall.

How to kill a Coreopsis

To kill this plant, plant it in a low spot with heavy mucky clay and it will die or over water it.  It comes back in the late spring so don’t be fooled and start to dig it up and kill it.  Be patient.  The dark green foliage is lacy and can be hard to see when the tiny shoots first emerge from the soil.

Companion plantings

I like to plant Coreopsis verticillata varieties with low water plants like Yucca ‘Golden Ribbon’, Caryopteris ‘Blue Mist’.  It’s a great texture complement to ornamental grasses like American Switch Grass, ‘Heavy Metal’ or Blue Oat Grass.  A mass planting of Coreopsis in the foreground with dwarf conifers and a  ‘Gilt Edge’ Silverberry shrub in the background is a very simple low maintenance plant composition.  For the cottage garden you can’t beat Coreopsis ‘Moonbeam’ with Nepeta cat mint and shrub roses like ‘Happy Chappy’ or David Austin rose ‘Graham Thomas’.

There are a lot of different species of Coreopsis out there and it’s buyer beware.  You have to pay attention to the names of the plants because there are some Coreopsis that make a nuisance of themselves and will seed all over your yard.   Many Coreopsis varieties are short lived so I tend to stick with these five. My Portland garden design clients love this plant for low maintenance, low water, and color in the summer landscape.