Archive for Plants I Recommend

Designers List of Shade Plants for Root Weevil Resistance

NE Portland Hostas with Root Weevil Damage

Root weevil damage distracts from an otherwise beautiful collection of shade loving plants.  

Designers List of Shade Plants for Root Weevil Resistance

I wanted to write a blog about shade plants for root weevil resistance. Root weevil disfigure so many shade garden plants and can make a garden look ravaged. It’s disappointing to see hosta and other plant leaves looking all chewed up. Can we design a shade garden with beauty and style without using root weevil favorite snack plants?

“Well HELL that’s not much of a shade garden” is what I said when I thought about eliminating all the plants root weevil like to eat. I was disappointed in the tiny number of plants that would work and wandered off to write about something different, something a bit cheerier!!!! However, I’ve been thinking about it and yes, we have some great plants we can use. 

Evergreen Shrubs  

Fatsia japonica Spider's Web in SE Portland Residential Landscape Design

Sometimes choosing an interesting variegated leaf, such as this Fatsia japonica ‘Spider’s Web’ can hide the notching caused by Root Weevil (look close!)

Aucuba, Daphne and Fatsia are not root weevil favorites and if you select the variegated forms the notching doesn’t show as much. To be specific, Daphne odora ‘Marginata’,  Fatsia japonica ‘Spider’s Web’, and Aucuba japonica ‘ Gold Dust’ are varieties that I recommend.

I have never seen much leaf damage on our Native Huckleberry (Vaccinium ovatum) probably because the leaves are so tiny.  

Three Root Weevil Resistant Rhododendron for Part Shade 

Grant Park Garden Design Rhododendron with Root Weevil resistance

The fuzziness on the bottom of the leaves on some Rhododendrons reduce Root Weevil damage.

I’ve found the official lists less than helpful since most Rhododendron listed are sun lovers. Root weevil prefer part shade to shade. 

Rhododendron ‘Clipiense’ is my best weevil resistant compact rhododendron for shadier situations. This rhody has fine hairs on the leaves so root weevil rarely bother it. It’s a slower growing variety and can take more shade than the other two I have listed but not deep shade.

Rhododendron ‘Fred Peste’ is a compact red rhododendron.  Fred does well in morning sun and afternoon shade, although he can take more sun than average.  

Rhododendron ‘Blue Diamond’ can take full sun but does well in full am sun and afternoon shade. It can get taller than wide.

Perennials   

NW Portland Sword Fern and Hardy Geranium in Residential Landscape Design

Sword fern (Polystichum munitum) and Hardy Geranium (Geranium macrorrhizum) do not show Root Weevil damage.

Sword fern (Polystichum munitum)  has a fuzzy frond (leaf) and root weevil don’t eat fuzzy leaves typically. Most fuzzy fronded ferns will be root weevil resistant and are an important player in a root weevil free planting. 

Hellebore argutifolius is perfect for NW Portland Landscape Designs

Helleborus argutifolius photo credit: Great Plant Picks

Hellebores are typically safe from weevil once they are mature plants. When the soft and munchable new leaves unfurl in February the root weevil have not hatched yet (here in Portland) so are not present until late April or May. The harder leafed hellebores like Helleborus argutifolius seem particularly impervious. 

Groundcover Plants   

Oregon Oxalis (Oxalis oregana) doesn’t seem to get a lot of weevil attention in my gardens and it is fun to add to salads. Same with our native piggy back plant Tolmiea menziesii. It has hairy leaves and is great for shade. For Saxifraga varieties, use the hairy leaved varieties for weevil resistance, the smoother ones are on the weevil munch list. Hardy geranium varieties that smell like cedar and have a fuzzy leaf are 100% weevil resistant – Geranium macrorrhizum for deep to moderate shade and Geranium x cantabrigiense for part sun areas. Another good bet is Sweet woodruff (Galium odoratum)

Last but not least, Euphorbia Rob’s spurge (Euphorbia amygdaloides var. robbiae) is a tough evergreen ground covering shade plant. I consider it a thug but it’s great to use in gardens where I have a path that doubles as barrier to their creeping roots. This plants roots must be contained or it will march right over your hostas. I’ve never seen any root weevil damage on this plant.

 Know Thy Enemy?   

Root Weevil have no natural predator here in the Pacific Northwest so it’s rare to find a shade garden without them.  We can cut the population of root weevil down to tolerable numbers and thus get our beautiful shade garden back. Read my blog “Attack of the Root Weevils”  to learn what can be done to reduce their population in your garden. 

 

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.”

Colorful Plants for Portland Winter Landscapes-New Zealand Pepper Plant

Colorful plants for Portland Winter Landscapes-New Zealand Pepper Plant    Cedar Hills residential landscape design Drimys Lanceolata is the perfect evergreen shrub

I enjoy a good hit of colorful plants year-round but especially in winter. The rest of the year has so many plant choices here in Portland it’s almost too easy for a garden designer. Winter has fewer selections for colorful plants and is a better challenge. Drimy Lanceolata – New Zealand Pepper Plant is not a new plant for designers but probably new to most homeowners. 

What’s so special about New Zealand Pepper Plant? 

It’s the foliage!

I love this plant for its visually delicious, red accented colored evergreen foliage. The spruce green leaf is set off by the dark red stems and red lines in the leaf. The new growth stem tips are more of a zippy coral red and when mature, they fade to dark Portland residential landscape designer's favorite coral bell plant, Heuchera 'Blackberry Crisp'burgundy.

Color echo: I find repeating the color of the stems and leaf “trim” with an underplanting in the same hue to be very satisfying. Using a burgundy Heuchera like ‘Blackberry Crisp’ with New Zealand Pepper plant illustrates the idea of a color echo nicely.

Versatile size

It’s very versatile size wise. It can grow into a “shree” (large shrub/small tree 8’ tall), or be maintained as a 3’ tall shrub. It’s easy to prune if you understand the basics and while I strongly suggest hand clipping, if you’ve grown it into a large shrub, it can be sheared with a small power trimmer.  The blades need to be small and sharp since you don’t want to chew up your plant leaves.  Don’t cut back into the old wood.  Typically it will have to grow some new foliage before it looks beautiful again. 

Year round colorful foliage in NE Portland landscaping. Photo taken in winter.

While the landscape is where Drimys shines the best, it is excellent for flower arrangements anytime of the year but especially useful in winter when choices are limited. It smells aromatic and the leaves and berries were used in the colonial days of Australia as a flavoring but apparently has a carcinogen in the oil of the leaf.  While small amounts are probably not harmful………………I would skip adding this to your salad. 

Best practices

Plant in raised or well-drained soil out of the range of lawn sprinkler heads. Water once a week deeply with a drip system or soaker hoses.  I’ve placed it in full sun but it works well with some direct sun or lots of lightly dappled shade (under the edges of a tree’s canopy).  It is not a shade or deep shade plant.    

Good drainage is a must. It will die if planted in a low spot or in heavy mucky clay soil. 

Colorful year round foliage shrub in Wiltshire Beaumont neighborhood N. E. PortlandEast winter wind can burn leaves

In Portland’s east counties in particular, the cold east wind may desiccate the foliage.  If I’m concerned about cold winter wind I will place it on the west side of the house in well-drained soil.   I have it growing quite happily in landscape designs in NE Portland, close in SE Portland and Beaverton.

Contact me, Carol Lindsay, when you are ready for an interesting full season planting plan (and hardscapes) for your home.

Plant partners:  a spring flowering heather like Erica carnea ‘Addrianne Duncan’, Heuchera (coral bell), Sedum x ‘Purple Monarch’, tiny leafed Hebe odora- boxleaf hebe like and American Switch grass -Panicum virgatum ‘Hanse Herms’

 

Wire Vine – Friend or Foe

Garden Design PortlandWire Vine – Friend or Foe?

Do you have a structure you need to cover and don’t mind occasional pruning?

Do you like plants with interesting color, texture and tiny leaves?  I have your plant.  Wire vine – Muehlenbeckia

Here are 4 ways to use wire vine.

Wire vine on an arbor and gate.

This entry gate has a definite hobbit landscape feel to it.  The wire vine growing on this rustic gate and arch creates a very unique look and is very easy care. All they need to do is trim it. It is mindless easy pruning and if it gets away from you it’s easily remedied by whacking it back to about 6” tall. If you don’t like trimming plants on a regular basis, this is not your plant. (Muehlenbeckia Complexa in photo)

Wire vine cascading down a wall

Garden Design PortlandHere is a photo showing a hot tub surrounded by a rock wall. It’s just a rubble style rock wall so no one painstakingly picked which rock to go where for the art form. It’s good looking with wire vine planted at the top of the wall.  The results are a cascading curtain of delicate looking foliage. The burgundy black stems add color to the winter view from the hot tub and softens the view of the wall. Another benefit, they don’t have to pull weeds out of the rock crevices because the wire vine does not share well with other plants. No weeding sounds like low maintenance to me. (Muehlenbeckia axillaris ‘Nana’ in photo)

Garden Design Portland

Wire vine as ground cover is only for hobby gardeners

Only use wire vine as ground cover if you are happiest out playing (working) in your garden.  Wire vine will try to grow right over the other plants and climb up the trunk of this lovely June Snow Dogwood (pictured). This photo of Muehlenbeckia axillaris is from a designer pals personal landscape.

Two kinds of wire vine

There are two kinds of wire vine and I find they get mixed up often at nurseries much to my annoyance. One is evergreen with slightly larger leaves  –  Muehlenbeckia Complexa. It’s also called Garden Design PortlandMuehlenbeckia complexa ‘Big Leaf’. This plant is less cold hardy than the smaller leafed type so could die in a bad winter but I’ve had it last for years in some client’s gardens.

Garden Design PortlandMuehlenbeckia axillaris ‘Nana’ has the smallest leaf but is not evergreen. In late fall the leaves turn a bronze orange (which is attractive) and fall. This wire vine will become drought tolerant and tolerates freezing temperatures best.

Sun or light shade

I grow wire vine in a variety of sun situations. They don’t thrive in deep shade.  I plant them in full morning sun or a mix of am and pm sun. I’ve placed it in full west facing afternoon sun where it gets dappled shade from trees or shrubs by 3 pm.

I would not grow it on my house but a garden shed is fair game.

Trim often or cut back by 4/5th’s at least once a year.  How you trim it depends on what you are using it for. If I grew it on a gate, I’d treat the stems and leaves as if they were fur and just shear it back to 1″or 2” thick.  If it’s in a pot I’d cut all the stems back to 2″ at least once a year.

Drought Tolerant Landscaping with Manzanita Plants in Portland

Drought Tolerant Landscaping with Manzanita Plants in Portland

Why am I excited about using Manzanita in my Portland landscape designs? 

Manzanita shrub in Arbor Lodge landscape. Landscape Design in a Day

It’s the water

To advocate the use of Manzanita is to advocate the use of drought tolerant plants. Happily we landscape designers are encountering more clients these days who want a low water landscape or want a completely drought tolerant yard. I can advise about the site conditions drought tolerant plants require and select attractive plants that meet the curb appeal test in addition to drought tolerance.   

Unique look 

Manzanita flowering in Woodlawn neighborhood of Portland - Garden Design

Manzanita flowering in Woodlawn neighborhood of Portland – Garden Design

It’s a new look for the landscape. My younger clients are done with  rhododendrons and azaleas, which are somewhat over used here. While Manzanita has attractive flowers, it is the whole package, foliage color, shape of plant, bark color and flower that is creating the popularity. I’m especially happy with the boost these plants give to the winter landscape. 

Fusion of modern style with NW Natural  

These plants are too naturalistic for formal landscapes but they look great with modern and craftsmen homes.  Style-wise Manzanita fit nicely with NW natural,  Mediterranean or even a southwestern look.  We get strong foliage contrast with  leaf blades (Yucca or ornamental grass), tiny needles like dwarf conifer,  heather (calluna type), lavender or fat leafed succulents like hens and chicks or sedum palmeri or other sedums.

New kinds of Manzanita to use in landscapes 

Drought tolerant Manzanita in Portland garden design as foundation plant.

Drought tolerant Manzanita in Portland garden design as foundation plant.

The fact that we now have more than one kind of Manzanita we can use can be laid at the feet of a handful of people who have crossed different kinds of Manzinita to produce plants that can thrive in our rich Willamette Valley soils.  They then tested the plant in different soil conditions and identified the plants that can handle life in an non irrigated garden or landscape.

When I started my Portland landscape design practice in the 1990’s there was a native Manzanita tree from the Oregon coast that “sometimes” survived here. They are so beautiful that I was tempted.  Still “sometimes” was not good enough for my designs.  I needed cold hardy Manzanita ground covers, shrubs, and small trees that would thrive here in the Willamette Valley and there weren’t any. Now I have them!!! 

Less weeding 

This benefit could take some time to realize.  Manzanita leaves contain a substance that discourages weeds. Leaves that shed from the plant should be left in place. It takes several years for these small leaves to build up enough of the substance in your soil to be effective. 

Pruning tip

Portland Residential Landscape DesignerOne of the common mistakes with Manzanita is to underestimate the width of the shrubs and small trees. Most cannot be pruned heavily and can be rendered so unattractive by pruning that tries to contain them, they will be removed. If you have no pruning skills (and most people don’t) be sure to place these plants where they have room to mature with yearly tip pruning only. 

Where to find these plants? 

While Xera Plants, Inc. and Cistus Nursery are the primary resource for retail, there are the Hardy Plant Society Sales (spring and fall) and tried and true mail order plant resources. If you are wanting drought tolerant landscaping and need a landscape designer contact me, I love to design with Manzanita.