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Warm weather speeds up need for rose pruning

Spring growth is already coming out; act before fungi strike

Peachy rose bloom  with a bee
This bee appreciates a Marilyn Monroe rose
blooming in mid-January. However, roses need to be
stripped of all foliage now to prevent fungal
infections in the spring. (Photos: Debbie Arrington)


Nature is putting pressure on plants -- and us gardeners.

All this unusually warm weather is prompting rose bushes and other deciduous shrubs to force out new growth.

When it comes to roses, many of us are still pruning our bushes -- or just started.

What happens when new leaves come out while the bush is still clinging to its old foliage? That new growth is super-prone to fungal infection.

Spores of powdery mildew, rust, black spot and other fungal disease are hiding on those old leaves -- on and off the bush.

Record warm days are likely in the next week. That will speed up rose growth even more.

Rose leaves with black spots

These old leaves above must go!
Below, lots of new growth already
on this Pink Promise rose, which
still has healthy mature leaves.




With that in mind, here are a few timely reminders for rose pruning:

* Prune tall. Even if pruning the bush down to just waist high, that's something. Otherwise, new blooms may open far above your head. It's hard to smell roses when your nose can't reach them.

* Make your cut about 1/2 inch above a bud or node (where a leaf was attached) facing away from the center of the bush. That encourages outward growth and better air circulation, another way to cut down on fungal disease.

* Strip off ALL the old leaves. They carry problems and the bush needs room for new foliage.

* Pick up the old leaves and debris on the ground under and around the bush. That fallen foliage harbors more fungal disease.

* Change your mulch. This is important particularly if you had a bad outbreak of fungal disease or spider mites. Discard the old wood chips, etc., and replace with fresh mulch (such as wood chips, leaves or compost).

* Hold off on feeding your roses until February. It's warm now, but that could change. If we suddenly plunge back into cold days and frosty nights, all that tender new growth can be at risk.

------
Note for newsletter readers: Kathy in her shrub pruning post on Thursday mis-typed one of the common names of Podocarpus. It is fern pine, not fern palm, corrected on the blog but not in time for the newsletter.  (Bad finger memory to blame!)

Funny thing is, that plant is not a pine, either, and even has been reclassified recently from Podocarpus gracilior to Afrocarpus gracilior, a new genus. So goes botanical naming!

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Garden checklist for week of May 31

Remember to water early. No more rain is in the immediate forecast.

* It’s not too late to transplant tomatoes, peppers, eggplant or other summer favorites. Make sure they stay hydrated.

* From seed, plant corn, melons, pumpkins, radishes, squash and sunflowers.

* Plant basil to go with your tomatoes.

* Transplant summer annuals such as petunias, marigolds and zinnias.

* It’s also a good time to transplant perennial flowers including astilbe, columbine, coneflowers, coreopsis, dahlias, rudbeckia, salvia and verbena.

* Let the grass grow longer. Set the mower blades high to reduce stress on your lawn during summer heat. To cut down on evaporation, water your lawn deeply during the early hours of the morning, between 2 and 8 a.m.

* Tie up vines and stake tall plants such as gladiolus and lilies. That gives their heavy flowers some support.

* Dig and divide crowded bulbs after the tops have died down.

* Feed summer flowers with a slow-release fertilizer.

* Mulch, mulch, mulch! This “blanket” keeps moisture in the soil longer and helps your plants cope during hot weather.

* Cut back fruit-bearing canes on berries.

* Feed camellias, azaleas and other acid-loving plants. Mulch to conserve moisture and reduce heat stress.

* Cut back Shasta daisies after flowering to encourage a second bloom in the fall.

* Trim off dead flowers from rose bushes to keep them blooming through the summer. Roses also benefit from deep watering and feeding now. A top dressing of aged compost will keep them happy. It feeds as well as keeps roots moist.

* Pinch back chrysanthemums for bushier plants with many more flowers in September.

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Food in My Back Yard (FIMBY) Series

Lessons learned during a year of edible gardening

WINTER

Is edible gardening possible indoors?

Hints for choosing tomato seeds

Starting in seed starting

Why winter is the perfect time to plant fruit trees

When to plant? Consider staggering your transplants

How to squeeze more food into less space

Potatoes from the garden

Plant a fruit tree now -- for later

Win the weed war by tackling them in winter

Tips for planting bare-root trees, shrubs and vegetables

Time to give vegetable seedlings some more space

Ways to win the fight against weeds

FALL

Dec. 16: Add asparagus to your edible garden

Dec. 9: Soggy soil and what to do about it

Dec. 2: Plant artichokes now; enjoy for years to come

Nov. 25: It's late November, and your peach tree needs spraying

Nov. 18: What to do with all those fallen leaves?

Nov. 11: Prepare now for colder weather in the edible garden

Nov. 4: Plant a pea patch for you and your garden

Oct. 27: As citrus season begins, advice for backyard growers

Oct. 20: Change is in the autumn air 

Oct. 13: We don't talk (enough) about beets

Oct. 6: Fava beans do double duty

Sept. 30: Seeds or transplants for cool-season veggies?

Sept. 23: How to prolong the fall tomato harvest 

SUMMER

Sept. 16: Time to shut it down? 

Sept. 9: How to get the most out of your pumpkin patch

Sept. 2: Summer-to-fall transition time for evaluation, planning

Aug. 26: To pick or not to pick those tomatoes?

Aug. 19: Put worms to work for you

Aug. 12: Grow food while saving water

Aug. 5: Enhance your food with edible flowers

July 29: Why won't my tomatoes turn red?

July 22: A squash plant has mosaic virus, and it's not pretty

July 15: Does this plant need water?

July 8: Tear out that sad plant or baby it? Midsummer decisions

July 1: How to grow summer salad greens

June 24:  Weird stuff that's perfectly normal

SPRING

June 17: Help pollinators help your garden

June 10: Battling early-season tomato pests

June 3: Make your own compost

May 27: Where are the bees when you need them?

May 20: How to help tomatoes thrive on hot days

May 13: Your plants can tell you more than any calendar can

May 6: Maintain soil moisture with mulch for garden success

April 29: What's (already) wrong with my tomato plants?

April 22: Should you stock up on fertilizer? (Yes!)

April 15: Grow culinary herbs in containers

April 8: When to plant summer vegetables

April 1: Don't be fooled by these garden myths

March 25: Fertilizer tips: How to 'feed' your vegetables for healthy growth