Hydrangea Plants

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  1. Stunted Growth of Hydrangea Bushes
  2. Sparse Hydrangea Blooms
  3. Brown Spots on Hydrangea Leaves
  4. Cutting Back Hydrangeas for the Winter
  5. How Long It Takes for Hydrangea to Change Colour? Can It Change Quickly?
  6. Pruning Back Hydrangeas
  7. Endless Summer Hydrangea
Asked by Anonymous on November 8, 2010
Stunted Growth of Hydrangea Bushes

About fourteen years ago I planted ten hydrangea bushes of the broadleaf variety, I think. Over the last four years or so half of them have become stunted in size while the others seem to be growing just fine. They are all planted along the same back northern exposure with a garage about six feet or so behind the bushes which have become stunted. What can be the problem?

ANSWERS
Nikki
Certified GKH Gardening Expert

It sounds like you have a grub or nematode of some kind in the roots of the plants. On the stunted ones, try gently lifting the roots and examining them for unusual root growth (knobby or enlarged roots) which would indicate nematodes or grubs, worm-like pests that are normally brown or gray in color. These pests would cause that kind of growth.

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Asked by Anonymous on November 10, 2010
Sparse Hydrangea Blooms

I live in an area where the winters are very warm and we rarely have frost. My big-leaf hydrangeas bloom, but the blossoms are very sparse. The bushes are large and grow well; and I prune as I’m supposed to. Why do I not have more blooms? They were planted about 5 years ago.

ANSWERS
Nikki
Certified GKH Gardening Expert

If you have sparse blooms, it is most likely from a lack of sunlight or a lack of fertilizer. Have the soil tested and if the soil shows no deficiencies, consider ways to get the bush a little more light.

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Asked by Anonymous on November 19, 2010
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.

ANSWERS
Heather
Certified GKH Gardening Expert

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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Asked by Anonymous on November 23, 2010
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.

ANSWERS
Nikki
Certified GKH Gardening Expert

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
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?

ANSWERS
Heather
Certified GKH Gardening Expert

Yes, you can change the color at any time. This article will help with how to do that: http://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
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?

ANSWERS
Nikki
Certified GKH Gardening Expert

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 Anonymous on December 8, 2010
Endless Summer Hydrangea

Can the ‘Endless Summer’ hydrangea be pruned in December in Arkansas, since it blooms on new growth?

ANSWERS
Nikki
Certified GKH Gardening Expert

Yes, that would be fine.

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