How to save our Imperial Mandarin?

From the start of planting 4 years ago, this dwarf tree quickly became one sided. The leaves fell off and branches died on one side of the tree.

One day a gardener tried pulling back the soil and found the non damaged side quite secure. So he left it where it was.

The pics are recent. The fruit is abundant and small but healthy.

How can we rehabilitate the tree? What’s plan should we follow?
One Neighbour suggested take off all the fruit, prune back hard, fertilize and protect from frost.

We have routinely fertilized since we got it with Osmocote, and once a year worm hit. Compost has been applied too.

It seems to something wrong with the root system. It’s embedded in good quality soil with a clay base. We grow other citrus veggies and herbs in the same garden with no problems.
I’m going to search root problems with citrus!
Thank you in advance for your recommendations,

John

In the photos you can see the bare branches at the backside near the fence.

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Comments

MitchellMc

Welcome to the Bunnings Workshop community @John57. It's fantastic to have you join us, and many thanks for your question about Mandarin care.

It appears the issues could be due to poor drainage, particularly on the backside, where the branches have died. Inspect the soil periodically to see if it remains waterlogged for a significant time after watering or rain. This can indicate poor drainage, which could be exacerbating root problems.

A tree planted on top of a clay base can face numerous issues, such as hindered root growth and poor water drainage. If water drains across the clay base and causes the roots at the rear to remain constantly wet, this could be the source of your tree's problems. Consider amending the soil with organic matter to improve aeration, and install drainage around the root zone if necessary. You might also consider transplanting the tree to a more suitable location with better drainage to ensure its long-term health and vitality.

Prune dead or diseased branches to enhance air circulation and sunlight penetration, balancing the canopy for even growth and remove the existing fruit to help the tree redirect its energy towards recovery. By addressing these issues, along with any drainage concerns, your tree should gradually recover and begin to thrive.

Here are a couple of helpful guides: How to plant, grow and care for a mandarin tree and How to diagnose a sick plant.

Please let me know if you have any questions.

Mitchell

John57

https://www.workshop.bunnings.com.au/discussion/comment/38198#Comment_38198

A comprehensive solution Mitchell, many thanks to you.

Sincerely

John

John57

https://www.workshop.bunnings.com.au/discussion/comment/38198#Comment_38198

Picked the mandarins but not yet moved the tree, its too cold and wet!

John57

https://www.workshop.bunnings.com.au/discussion/comment/81396#Comment_81396

John57

https://www.workshop.bunnings.com.au/discussion/comment/105861#Comment_105861

I really don’t get this tree and situation. I pour iron chelate in the recommended dose. I talk to it 😉

Abd it goes from green with fruits to yellow and dropping leaves. I made one jar of mandarin marmalade out of the fruit and yummo!
It’s definitely worth saving. And this tree needs to be be moved. What size pot should I put it in please? Other ideas are when we move it will be to inspect the root system to look for - what should I be looking for? Bugs, disease, fungus? Twisted roots? Does it drink from the thin surface roots or the deeper thicker roots? I appreciate any briefings here but this won’t be done until after winter I presume?

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/120083#Comment_120083

I'd be going for the biggest pot possible, @John57. My preference is to use a full-sized oak half-wine barrel. Not the ornamental kind that is quite small, but a proper oak barrel. We typically have them in our stores in the warmer months.

When inspecting the root system, check for insects like root mealybugs or aphids, which can damage the roots. Look for signs of disease or fungal growth, such as rot; healthy roots should be firm and white. Also, be mindful of twisted or circling roots, which could hinder its growth.

Mandarin trees use both thin surface roots, which absorb water and nutrients, and deeper, thicker roots, which anchor the tree and access deeper water reserves. For the best results, plan to move the tree after winter or in early spring when it is less active. During this period, the tree is dormant, reducing stress from the move. Keep the soil consistently moist but not waterlogged, and water deeply to encourage strong root growth.

Additionally, use a balanced fertiliser designed for citrus trees to support healthy development. It's best to ensure the plant is covered by a slow-release fertiliser rather than to dose it with things like iron chelate. They are good for addressing specific issues, but they don't solve the underlying issue of the plant not being adequately fertilised.

Mitchell

John57

https://www.workshop.bunnings.com.au/discussion/comment/128794#Comment_128794

Thanks Mitchell. I seem to be on the right track and appreciate your confirmation here.

John

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