Archive for Parking Strips

Tips to succeeding with Manzanita in Portland Residential Landscapes 

Tips to succeeding with Manzanita in Portland Residential Landscapes 

Drought tolerant landscaping in Southeast Portland

Manzanita (called Arctostaplylos – Arc toe staff eye loss) is the new cool darling plant here in Portland. The reasons why are numerous, unique “new” plant, drought tolerance, attractive in winter and all year, and there are now many diverse shapes and sizes to work with that will survive here. Years ago I only used this plant for a plant collector garden because they knew it was a crap shoot as to whether it would survive at all.   

As a Portland landscape designer I want plants that will serve many purposes in my designs. For people who are done with the overuse of Rhododendrons and Azalea and want drought tolerant plants, Manzanita is the perfect plant. Before you fall in love, I want to give you some tips for succeeding with Manzanita in Portland. They have requirements that must be met if you want them to thrive. 

Please see my previous blog “Portland Landscape Designer Advocates use of Manzanita in Xericscapes”.

Tips for succeeding with Manzanita in Portland 

Select the right site, conditions and plant companions 

Most are intolerant of summer water….clients must understand that they cannot coddle these plants, they cannot plant annuals with them for summer color, they cannot fertilize, they cannot water these plants after they are established or they will die.

Plant on a berm 

Ground cover Manzanita in Raleigh Hills

In many Portland landscapes planting on a berm will be necessary to avoid root rot. You will see bermed soil areas here even in parking strips. Portland parking strips (the 4’ wide ones) are a popular place for many of the new smaller types of Manzanita and for drought tolera

nt or xeric styled plantings. Most of the Manzanita I am using are too wide for a 30” parking strip. 

Planting companions

Planting companions must have the same no water requirements because it’s hard to remember not to water one plant and that you must water the one next to it. If any kind of auto irrigation is used the first summer it must be disconnected, dismantled, hell-dismembered so no one accidentally waters that second summer.   

I select companions from Mediterranean or NW native plant palettes. Some mid west native prairie plants also work well with Manzanita. Herbs, ornamental grasses and xeric perennials like Penstemon or ice plant are easy companions and Heather (Calluna Vulgaris types) are one of my favorite for texture contrast.  

Buy small plants 

It’s best to buy small plants and they will establish faster

Drought tolerant landscape design, Manzanita shrub in North Portland

than a larger plant with a higher survival rate. Large sizes of these plants are not available anyway. Many of these plants will be available in a 4” pot or perhaps a quart sized pot. Smaller plants make more sense in this case but don’t expect them to be inexpensive. You are paying for all the research and extensive work to create these new plants. 

Select the right Manzanita 

The trial and error approach for picking which one to buy and where to plant it is going to be very frustrating. There are quite a few new plant types to pick from and some grow very fast, some slow. Some may be pruned hard because they have a burl (what’s a burl?) and others would be ruined with such treatment. Your Portland landscape designer needs to be an expert or have access to one. If you are on your own, buying from Cistus Nursery or the retail store Xera Plants, Inc. is the best way to get the expertise you need from their very knowledgeable staff.   

I talked to Alana Chau at Cistus Nursery. Here is her list of plants that will be available that I especially liked. 

 Arctostaphylos hookeri ‘Green on Black’  18” high and can handle some clay soil. 

Arctostaphylos × media ‘Martha Ewan’ is a nice size maturing at three feet tall and it can be tip pruned. It gets wide so give it room to be 4 or 5 feet wide. 

Arctostaphylos Stanfordiana ‘Mills’ or A x ‘White Lanterns’ both at 4’ tall 

Arctostaphylos Dr Hurd’ is a curvaceous 8′ to 10’ tall small tree and is planted at the entrance to Cistus Nursery 

Arctostaphylos  mewukka or Arctostaphylos patula can be pruned heavily. (They have a burl and once established they can be pruned back to the burl, for non horticultural nerds just know this means you could plant one of these closer to your walkway than many of the other varieties because the size could be controlled without ruining the appearance of your plant.) 

(We designers get excited about plants who fit into a small landscapes so we might be more excited that this burling option than you are). 

 My manzanita guru, Paul Bonine explains about burls in his article in Pacific Horticulture, Arctostaphylos for Pacific Northwest Gardens “Some Arctostaphylos species develop an enlarged area called a burl at soil level; new shoots emerge from the burl following fire or extreme drought, or from extensive pruning to rejuvenate a plant in the garden.”

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.

 

Native Plants for Small City Landscapes

Native Plants for Drought Tolerant City Landscaping

NW Native plant Sword fern is drought tolerant.

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 that are drought tolerant.  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 for drought tolerant landscaping.

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.

Native Oregon drought tolerant 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 used in drought tolerant landscaping.

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 for drought tolerant landscaping.

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.

Drought tolerant native 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.

If you are looking for drought tolerant landscaping, contact Carol for more information on Oregon native plants.

 

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. Read More →

Diversity of Dogwoods Part II

Portland Landscape Designer Appreciates Diversity of Dogwood Trees

The diversity of dogwoods is well illustrated by these two trees:  Cornus Kousa ‘Summer Gold’ and Cornus Controversa ‘June Snow’.

Summer Gold dogwood

Bright cream flowers are backed by colorful variegation of ‘Summer Gold’ dogwood. Photo courtesy of Heritage Seedlings

Korean Dogwood ‘Summer Gold’

I love ‘Summer Gold’ partially because it’s so different from other dogwoods.   ‘Summer Gold’ has narrow bright green and gold leaves and an upright narrow shape.  The shape fits into urban settings much better than a round headed typical dogwood.

Traditional dogwoods (Cornus Florida and Cornus Kousa) have a wide oval solid green leaf and a  20′ or more wide round canopy.   ‘Summer Gold’ was created by local Crispin Silva who is a delight.  His curiosity and enthusiasm about plants has inspired many people in Portland including me. People here refer to his plants as “Crispin’s Creations”.

‘June Snow’ can be the single tree in your backyard because she has it all, grace, fall color, and an amazing floral display.

‘June Snow’ Dogwood matures at 30′ tall and spreads to 40′ wide. She has an arching shape and while bigger than typical dogwoods She has the most graceful silhouette even in winter.  I use her to create light shade for medium to medium small landscapes.  Too big for your typical row house back yard that is only 20′ wide, with another ten feet she can be the single beloved tree.  She was introduced by J. Frank Schmidt Company also near Portland, Oregon.

Her branch structure is incredibly graceful and open.

Cornus 'June Snow'

‘June Snow’ dogwood at Portland’s Legacy-Emanuel Hospital in The Children’s Garden.

When she flowers in June these flat topped clusters (which often exceed 6 inches) seem to float above the foliage.  The fall color on ‘June Snow’ can compete with any dogwood. The color show starts with orange yellows and moves into intense purple red and purple as fall deepens.  The fruit that develops from the flower clusters are quite tiny and not messy.  The local birds will eat them.

Studying trees is what Portland landscape designers do so we can bring you the best choices.  Ok and we are geeky about plants.   Read more about dogwood trees….. Diversity of Dogwoods Part 1