Top Questions About Macadamia Tree

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Questions About Macadamia Tree

Asked by
pman2000 on
March 22, 2019
Highland CA zone 18

Q. 25 yr old Macadamia Nut Tree . Zone 18. Last 2 yrs had leaf chlorosis, weak if any flowers, no nuts formed. No signs of disease. End

of life cycle No signs of disease in roots, trunk, etc, but leaves make the tree look like it’s dying. pH 6.23, P and Zn high off the charts, low N ( have been adding feather meal over the last 6 months to no avail.) All other nutrients are within or nearly in target area.

Answered by
Downtoearthdigs on
March 23, 2019
Certified Expert
A.

Your foliage looks like it has a combination of nutritional deficiency, foliage disease (possibly anthracnose).
You may need to do soil analysis and you may need the help of an Arborist to determine the specific disease cause and treatment plan.
This article has more information.
https://www.samac.org.za/wp-content/uploads/2016/08/PestDiseases_SymptomsManagement.pdf
You may also want to contact your County Extension Office to see if they have any help for these diseases in your region.
https://www.gardeningknowhow.com/extension-search

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Asked by
RonzNutz on
June 11, 2019
Lakewood ca. 90713

Q. Best method to deep water a macadamia tree

I have a mature 45′ mac tree in so. cal. In summer of 2018, after years of drought and a few days of 105 plus temps, it dropped a large % of its nuts in an act of self preservation. I would like to try deep watering this summer and question whether to water at the drip line or closer in to the trunk or both? Tree appears to be healthy as ever right now.

Answered by
BushDoctor on
June 12, 2019
Certified Expert
A.

There are no feeder roots near the trunk, and the large roots will not take up water. They are only for stability.

In order to deep water, you will have to move out from the tree several feet, and then water. Sometimes it can help to bore a few holes down into the ground to let water penetrate through tough soil if this is the case.

This article will help: https://www.gardeningknowhow.com/edible/nut-trees/macadamia/how-to-grow-macadamia-trees.htm

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Asked by
Anonymous on
July 11, 2019

Q. need help with macadamia tree

Healthy 40 yr old mac tree in SoCal started mass drop of nuts 7-10-18 and continues today. Over 1000 nuts on ground in 48 hrs. Nuts are 50 to 75% mature. Conditions are typical, this is a first.

Answered by
Downtoearthdigs on
July 11, 2019
Certified Expert
A.

It is most likely that the tree is reaching an age that will not allow it to produce healthy fruit. They will often drop what they cannot support. It may be that you need to fertilize the tree, as the soil can run out of nutrients over time, especially if it is not fertilized annually.

This article will help you with the care of these trees: https://www.gardeningknowhow.com/edible/fruits/figs/fig-tree-is-producing-fruit.htm

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Asked by
Anonymous on
July 11, 2019

Q. I have macadamia nut growing on a bush. All the literature talks about trees.

Is there a bush that grows these nuts? I live in Nebraska and this is the first time I have seen something growing on the bushes. I have taken it to a plant place and showed them the nut inside the covering that is how I found out what it was. All the information mentions trees.

Thanks

Shirley

Answered by
Downtoearthdigs on
July 11, 2019
Certified Expert
A.

Macadamia are typically trees, but may have a shrub form, although I've never heard of it.

They are a subtropical and tropical region plant. So if you have a shrub growing and surviving through a winter outdoors and producing nuts, in Omaha Nebraska, I suspect that it is not a macadamia.

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