Top Questions About Walnut Trees

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Questions About Walnut Trees

Asked by
Anonymous on
April 2, 2011

Q. Leaking Sap (Walnut Tree)

I recently had my walnut tree pruned professionally and noticed that there is a lot of sap dripping from one of the sawed off branches. Is there anything that I can put on this to stop it from happening, as it is obviously detrimental to the tree and staining it?

Answered by
Nikki on
April 2, 2011
Certified Expert
A.

Sap flow does not hurt the tree. Some trees have free-flowing sap that “bleeds” after late winter or early spring pruning. Although sap flow is not injurious to trees, it may be upsetting to the homeowner. Pruning in early to midsummer, after the leaves have matured, will prevent unsightly sap flow.

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Asked by
BLUE on
April 9, 2011

Q. Can I Plant Magnolia or Gardenia Close to the Walnut Tree?

Can I plant Magnolia or Gardenia close to the walnut tree?

Answered by
Heather on
April 11, 2011
Certified Expert
A.

If it is a black walnut, than no, I would not recommend planting them near the tree. But if it is another variety of walnut, this should be fine as only black walnut is allelopathic.

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Asked by
Anonymous on
April 23, 2011

Q. Leaking Tree Sap

In pruning some branches off a large walnut tree, sap is leaking out like a dripping tap. Do I need to worry about this? If so, what do I do?

Answered by
Nikki on
April 24, 2011
Certified Expert
A.

Sap flow does not hurt the tree. Some trees have free-flowing sap that “bleeds” after late winter or early spring pruning. Pruning in early to midsummer, after the leaves have matured, will prevent unsightly sap flow.

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Asked by
Anonymous on
April 25, 2011

Q. Planting Flowers Under Walnut Trees

Is there any truth to the saying that flowers won’t grow under walnut trees? What is your advice?

Answered by
Nikki on
April 26, 2011
Certified Expert
A.

It is true if it is a black walnut tree. Black walnuts are poisonous to most plants. This article will help: https://www.gardeningknowhow.com/edible/nut-trees/black-walnut/black-walnut-compatible-plants.htm

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Asked by
abneek on
July 22, 2011

Q. My Walnut Tree

My Walnut tree, which is only about 12 year old, is dying on me. There is some black fungus on the walnut and I see some bubble like things on the leaves. Any idea how I can cure that? Thanks a lot.

Answered by
Heather on
July 24, 2011
Certified Expert
A.

It sounds like it may have walnut blister mite. This article will help:
http://ceventura.ucdavis.edu/Gardening/Coastal/Veg-Fruit/PVD_Menu/Blister_Mite/

The black fungus may be attracted to the weakened tree. There are a few kinds it could be, but they can all be treated with fungicide.

To tell the truth, I would recommend treating the tree with neem oil. It is both a fungicide and a miticide and is safe for people and pets. Here is more information on it: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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Asked by
Anonymous on
August 17, 2011

Q. Toxic Roots of Walnut Trees

I have planted five walnut trees among several pine cone trees in my backyard. The walnut trees are about 2-3 feet high now and growing fast. Will the toxic roots of the walnut trees be detrimental to the pine trees?

Answered by
Nikki on
August 17, 2011
Certified Expert
A.

Most pine trees do not grow well within 50 feet of black walnut trees. If the black walnuts are closer than 50 feet to your pine trees, we recommend that you move them to a better location.

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Asked by
lcguille on
November 20, 2011

Q. Why English Walnut Didn’t Set Fruit

15 year old tree-great producer. This year, not a single nut. Any ideas? Thanks

Answered by
Heather on
November 21, 2011
Certified Expert
A.

This could have happened for a few reasons.

First, this tree has both male and female flowers. If the male flowers did not bloom well at the same time as the female flowers, then you would have reduced or even no fruiting.

A late spring cold snap may also be to blame. The flowers are far more tender than the leaves and branches, so while the tree itself would ahve looked fine, if you got frost after the flowers opened, that would ahve killed them and then you would have no fruit.

Another possibility is that the tree has passed its fruiting maturity. Trees, like animals, have a life span and a set amount of time it can produce. It is possible that your tree has just gotten too old to produce. But, normally, if this is the case, you would have seen a gradual decline in production over the past few years.

Poor conditions may also have been to blame. High heat and humidity during pollination can make the pollen sticky and clump up, which makes it difficult for the pollen to get from the male flowers to the female flowers.

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