Potted Outdoor Kumquat Tree Leaves Mottled And Yellowing

Question

I love this tree and it’s produced abundant blossom and fruit but I feel like I’m losing the battle with the yellowing leaves. It’s produced new growth so it can’t be under watering. But I’m confused if it’s overwatering – root rot or zinc / manganese deficiency. Please help!!

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Answer 1

It could be a number of issues. I can't see the soil, so I can't confirm under/overwatering, though overwatering is a lot more likely. This will suffocate roots, and appear to be many deficiencies.

You can cut all doubt, however, by testing pH and nutrient content, and by testing soil moisture.

These articles will help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/test-soil-for-pests-and-diseases.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/making-sure-soil-drains-well.htm

This article will help you to care for your tree:

https://www.gardeningknowhow.com/edible/fruits/kumquat/growing-kumquat-trees.htm