Top Questions About Hydrangea Plants

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Questions About Hydrangea Plants

Asked by
Anonymous on
November 19, 2010

Q. Brown Spots on Hydrangea Leaves

I have 8 hydrangeas in my garden, all on the same side of the house, facing east. About 3 of them didn’t flower this year, and was worse, 5 of them have brown spots on their leaves. How can I remedy this? I live near the southern coast of Long Island, NY and I’m getting ready to cut all the plants for the winter.

Answered by
Heather on
November 22, 2010
Certified Expert
A.

It sounds like you may have a fungus. This is a common cause of spots on leaves. I would recommend treating the plants with a fungicide and destroying anything you prune from them so the fungus does not have anywhere to overwinter.

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Answered by
mikelapi01 on
April 3, 2018
A.

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Asked by
Anonymous on
November 23, 2010

Q. Cutting Back Hydrangeas for the Winter

I understand I must cut back old wood from bottom of plant before winter sets in and. . . . . .
. . . I want to be sure I can tell the difference between the old wood and new wood, one year I cut them back and it took two years before I had any blooms on the plants.
Naturally, I do not want a repeat of that error.

I will appreciate your help.

Answered by
Nikki on
November 23, 2010
Certified Expert
A.

If you are hesitant, you can wait till early spring to cut back the plant. At that time, the new wood will be green in color, while the old wood will be brown. You can use this rule of thumb for fall/winter pruning too, but it is much more obvious in the spring.

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Asked by
Anonymous on
November 24, 2010

Q. How Long It Takes for Hydrangea to Change Colour? Can It Change Quickly?

I want to do some experimenting on changing hydrangea colour. If the tree is already grown, can i still change the colour of the flower?

Answered by
Heather on
November 25, 2010
Certified Expert
A.

Yes, you can change the color at any time. This article will help with how to do that: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm

 

It normally takes about a season to change the color.

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Asked by
Anonymous on
December 7, 2010

Q. Pruning Back Hydrangeas

I forgot to cover my hydrangeas before a soft freeze. The plants look awful. Have I killed them or can I cut them back (similar to the lantana) so they can possibly re-grow after the winter?

Answered by
Nikki on
December 8, 2010
Certified Expert
A.

As long as the stems are still green, it should recover. I would not trim it back yet, the leaves may regrow where the old ones died back. Give it a week or two and see if you see leaf buds forming before pruning it back. That being said, you may not get blossoms this year as the frost may have killed the buds.

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Asked by
artorsone on
December 11, 2010

Q. Can I Grow Hydrangeas in Zone 6 for Cutflowers?

I have a well drained 7 acre field that I’d like to grow Hydrangeas for cut-flowers. I realize I’ll only have blooms for apx 3 months of the year however I believe I can sell the stems in that short window. Am I wasting my time?

Answered by
Heather on
December 12, 2010
Certified Expert
A.

Hydrangeas do well in zone 6, so I don't see why you could not. I would talk to a reputable local nursery about the best variety for your area, though. While most hydrangeas do well in zone 6, some hydrangeas do better in some kind of conditions than others. Plus, you will need to take into account that your will be growing them in full sun conditions, which some hydrangea handle better than others. A local nursery will know what is best for your area.

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Asked by
Anonymous on
December 13, 2010

Q. Tree Hydrangea Damage

I have 2 new tree hydrangeas in my backyard, planted this fall, about 5. 5-feet high presently. We had a snowstorm this week, and the weight of snow and ice on the dead flowers that had yet to fall off caused a large limb to nearly snap. The top of the limb was resting on the ground, but the limb was still attached to the tree by just a bit more than bark. The split is at the point where the main trunk branches out into 4 or 5 limbs. I’m currently holding it back in position with athletic tape. Any chance it survives? Is there a better way to increase my chances? I planted thetwo close together on my back lot line for some privacy, and they’re about the same size. I’ll be really bummed if it can’t be repaired, as it makes one much smaller/less full than the other.

Answered by
Nikki on
December 13, 2010
Certified Expert
A.

It probably cannot be repaired, but the steps you have taken are what you can do to at least give it a chance. Don't write them off yet as not being able to achieve the same size. They can fill in rapidly, so in a year or so, the size difference may not even be noticeable.

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Asked by
Anonymous on
December 23, 2010

Q. Hydrangea With Fungus

My very young Hydrangea seems to be growing well enough, but the leaves are turning purple. I’ve located information that indicates this is a fungus, but can’t find anything that tells me what to do. I live in South Alabama, so the weather is mild, seldom getting to freezing and usually sunny and in the mid 40’s-50’s in the afternoons of winter.

Answered by
Nikki on
December 23, 2010
Certified Expert
A.

Have the soil tested. It may be a phosphorous deficiency. Purple leaves are a sign for this deficiency. Regardless, adding a little phosphorous will not hurt the plant and will help with blooming. Here is more information: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

I think the fungus you are referring to typically shows itself as purple spots, rather than whole leaves turning purple. But, if you are still concerned that it is a fungus, treating the plant with a fungicide will not harm it. You can buy fungicides at your local plant nursery.

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