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I have an older rose bush that produces gorgeous buds but they fail to open . . . what can I do?
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Posted 2016-04-27T19:44:46+0000  by Nanifay Nanifay
 
Our Garden Experts are away today, Nanifay, so in their absence I'll try to help.

Successful rose growers are meticulous about removing decaying leaves and buds from the bed to prevent the spread of diseases.

Water in the early morning and do not touch wet leaves as this may promote the spread of disease.

Inspect leaves primarily in the afternoon when the plants are dry, and prune any sign of disease.

Clipped leaves and buds should be removed from the bed.

And, spread additional mulch periodically to prevent fungal spores from spreading on the surface of the old mulch.

Black spot and rust spot are two very common fungal infections.

Dormant oil and summer oil can both be made from Pharm Oil.

Mix 10 tablespoons in a gallon of water for dormant oil and 5 tablespoons in a gallon of water for summer oil.

These seasonal mixtures suffocate insects, larvae, and eggs, and control powdery mildew, wilt and more.

Early spring application of dormant oil is noted in gardening circles for promoting a pest-free start.

And periodic application of summer oil throughout the growing season is noted for preventing fungal infestation.

Magnesium sulfate from Epsom Salt is an important source of nourishment that promotes vigorous bloom growth.

The manufacturer recommends between one-fourth and one-half cup spread around the base of each plant early in the spring.

A mixture of one-tablespoon per gallon of water can be misted onto each plant every two-weeks during the growing season.

While many rose enthusiasts prescribe nutrients and anti-fungal home remedies, check with your local horticulture specialist at The Home Depot Garden Center.

They can recommend common rose nutrients and anti-fungal treatments used successfully in your growing zone.

If possible, bring a sample of your buds and leaves, and share them with your Garden Associate.

And above all else, come back and share your success with The Community.

DIY is even more gratifying when you help others learn from your experience.

Hope this helps,

Pat InPaint


BTW:
Our Garden Experts will certainly add their expertise when they return.


Posted 2016-04-27T20:52:57+0000  by Pat_HD_ATL
Hi Nanifay,

The most common cause of bloom failure is from insects and disease. Aphids and mites can deplete the sap from healthy plants, particularly around the flower buds. Roses are also prone to fungi that can reduce the plant's ability to produce flowers.

Neem oil is available to control all of these issues. According to the manufacturer, Neem is a botanically derived pesticide that helps control fungi, insects and mites and can be used on ornamental flowering plants, trees, shrubs, foliage, vegetables, herbs, fruits and nuts. The oil is not harmful to beneficial insects such as ladybugs and honeybees and is safe around mammals, birds and humans.

Neem is OMRI certified organic, too.



Southern Ag 8 oz. Triple-Action Neem Oil

Be sure that your rose has enough light and has not dried out. Feed them as needed and avoid aggressive pruning during the growing season. Save that for the dormant season.

I hope that your rose will rebound and give you lots of flowers this season.

Thanks for asking,

-Travis
Posted 2016-04-29T14:35:45+0000  by Travis_HD_ATL
Hello Nanifay.  Welcome to the Community!

Since your roses have "gorgeous buds", we can eliminate a few issues such as watering, too much nitrogen, lack of sun.  In essence I assmune that the plant would be fine if only it would burst into color.

Fungal and insect infestations should normally be visible upon careful inspection, so I will move on to a couple of possibilities.  Pat's response details well how to ensure these are not an issue.

First, have you had a cooler than normal spring?  Cool weather will delay blooming.  I live in Chicago so I don't know if your Oregon spring has been cooler than normal as ours has been.

The other possibility that comes to mind is the presence of sufficient phosphorous, the food that encourages blooms.  An application of a water soluble bloom builder fertilizer, at the prescribed rate, will do no harm while giving the roses just what they might need to explode in color. Bone meal or composted manure would work as well although you would have to mix them into the soil, and they will not act as quickly.

As you can see, there are a number of reasons why roses will not quite cooperate.  As Pat mentioned, if you find anything that looks wrong, a local Home Depot nursery expert can be helpful to inspect samples of leaves and buds to find a solution.

Chris.

.


Posted 2016-04-29T15:01:44+0000  by Chris_HD_CHI
What I see with aging landscapes is what might be happening here. Younger landscapes have smaller trees and sun is abundant everywhere. Plants that slowly stop producing blooms, slowly get taken over with shade. Shutting down bloom production is typical for plants whenever they go into survival mode. The red maple that sits in my front yard was once small, with a 8 foot round pine island around it. That tree is huge now and the island around it is about 16 foot round due to it shading and killing my Bermuda grass.

Roses do not tolerate shade and with shade comes disease.


Posted 2016-05-08T18:44:23+0000  by Ingar_HD_ATL
 
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