Tacoma Home and Garden Show notes

Sustainable Rose Growing – Variety selection is the key to success

Elena Williams – Master Consulting Rosarian

Evergreen Rosarian, my blog

American Rose Society rose.org

Regional: PNWdistrict.org

Local: tacomarosesociety.org

 

Location considerations: near coast, foothills, east of the Cascades

Soil composition

Sand, wind…
Soil pH 6.0-6.5

Compost and mulch

 

Sustainable generally means we want roses that are disease resistant

Resistant to what? Fungi – Green Cure organic fungicide

 

Black spot
Bottom up

 

Powdery mildew
top down

 

Downy mildew
top down

 

Botrytis

August dew on blooms

 

Roses with known disease resistance in my gardens

 

Knock Out -Radler

Kordes – Roses from Germany

‘Artistry’ HT

‘Dick Clark’ GR

‘Easy Does It’ FL

‘Francis Meilland’ HT light pink to white

‘Hot Cocoa’ FL

‘Sunshine Daydream’ GR light yellow

 

David Austin shrub roses: ‘Graham Thomas’ ‘Abraham Darby’

Old Garden Roses     before 1865
Roses respond to fertilizer

Water during PNW Drought months June, July, August

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Sustainable rose growing

What is your tolerance for insect damage and fungal disease on roses?

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It is a personal question and the answer can change depending on the uncontrollable factor of weather or the amount of time you have to devote to roses or your personal philosophy of what is the right way for you to garden.

I prefer to not use insecticides in my garden because I have fruit trees and mason bees that I nurture for pollination of my fruit. When aphids come to visit my roses, I often see ladybugs working on them, but I often get my hose with a medium spray nozzle and blast aphids with water for a few days in a row. The aphids fall to the ground and since they cannot fly, most do not return. If they are not removed, aphids continue to reproduce and damage roses.

If we have a hot dry June and July and I suspect spider mites will be active. Again, get the hose out with a spray nozzle. Spraying water and a slight rubbing of the leaves, especially on the undersides will deter the spider mites. So the word “spray” is not a bad word in my garden. I spray water, I spray liquid seaweed, I have been known to spray chelated iron and products approved for organic gardening.

Fungal diseases can do a lot of damage is a relatively short period of time. Once you see the damage, you cannot return the foliage to perfect again. As soon as a fungal disease shows, it is best to trim off (not tear off) the disease and do what you can to stop it from spreading. Some roses are resistant to fungal disease by hybridization. That is why you may see one or two roses badly defoliated (in a public garden for example) while others in the area stay clean.

The photos are examples of the continuum of possibilities for your rose garden. The amount of time you have to spend in the garden may change from year to year. Do not get discouraged if pests and disease appear. Contact a local Consulting Rosarian for help.

Local help for roses