Kumquats, like their cousin citrus trees, are quite heavy feeders. However, these babies are not too picky when it comes to food.

If the native soil in your area doesn't provide enough nutrients for the trees, you may need to feed them. Otherwise, they would do well with what's available.

Let's check out some good food ideas for feeding.

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For Kumquat Trees in Ground

In-ground kumquat tree Japan

Here's an idea (from Supreme Family Garden) that you can try to make a kumquat fertilizer:

  • A dark bucket
  • Superthrive (natural & non-toxic, non-organic)
  • Banana peel: potassium
  • Egg shell: calcium
  • Epsom salt: magnesium
  • Lettuce: nitrogen

To make the kumquat fertilizer, in a dark bucket, mix in some Superthrive, banana peels & egg shell. The darker color helps absorb more heat & thus helps break down the content inside. We leave the bucket in a warm place for a while.

After the materials have been broken down & given out quite an unpleasant smell, we can start using them as a fertilizer for our kumquat trees. You can pour some of the liquid around the plant.

If your land is slightly elevated, make sure to pour on the higher end so the liquid can flow down sideways, making it easier for the roots enjoy.

Adding some Epsom salt (magnesium sulfate) & lettuce helps with the green leaf growth. The banana peels we used earlier is for phosphorous & egg shell for calcium.

Before using this solution, you can try mixing some Milorganite into the soil. This stuff has some good nitrogen & is sold in a big bag for very cheap. People also use it for their lawn. Remember to add chelated iron if needed. This helps with the yellowing of the leaves.

A magnesium in the center of chlorophyll
Good epsom salt
Green leaves
Sulfur strengthens the roots
Resealable for many uses

Some folks say that using nitrogen blocks out the calcium intake in the soil. That's why magnesium (like Epsom salt) or chelated iron is recommended as some supplemental minerals for the kumquats.

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For Kumquat Trees in Pots

Fruitful kumquat trees grown in containers

When growing your kumquat trees in pots, the key thing you should watch out for is water drainage.

Kumquats, like other citrus trees, don't like wet feet. They'll rot easily if there's standing water at the bottom.

With that in mind, you can creatively mix the food for your baby.

Here are some other ideas for kumquat fertilizer:

Best Kumquat Fertilizer: Top 4

Many folks use EBStone. This stuff is great & does not burn the plants. It's quite pricey for a small bag. But the per-pound value is unbeatable for bigger bags (if you have lots of kumquats or other citrus plants to feed).

Best Value Organic Feed
Promotes lush green foliage
Humic acid to retain nutrients
Beneficial microbes & root fungi

This other one below has some extra trace elements (micro-nutrients) like calcium, sulfur, iron & zinc. These are good for the overall tree structure, root & leaf growth.

Down-to-earth Citrus Mix
For all citrus trees
Extra micronutrients
All-natural sources

Osmocote plant food can be used for 6 months. You don't have to keep feeding the babies everyday & it doesn't burn the roots. This is a good choice for busy folks:

Long-lasting Feed
6-month feed
10+ nutrients
For potted & in-ground

If you have some extra cash to spend, check out Citrus Tone. It's more expensive but it has strains of bacteria that are formulated for the kumquat roots.

Premium Citrus Tone
1000+ living microbes
Minor odor
No trace elements

Happy Feeding

Happy trees, happy humans. Yum yum, it's dinner time for the plants. When you do the fertilizing for the babies, make sure the weather is nice & cool. People do it in the evening time or early morning, especially for kumquats in pots.

Hope this was helpful for your little kumquats. Thanks & see y'all next time here again.

Responses to Readers' Question

My kumquat tree is producing green and bit yellow leaves in spite of adding lots of citrus fertilizer. The tree is about 10 feet tall.One or two fruits in a season .What could be the problem ? The plant is about six years old.

--> hmm.. thanks for your question. Is the plant getting full sun in the morning and afternoon? From a grower's experience, when her partner moved the plant to a corner where it's sunny in the morning but gets no sunlight in the afternoon, the plant didn't fruit much that year. They moved it back to a full sun place and it's recovered to doing fine and loaded with fruits.

She waters the plant daily, even when it's flowering. Although some folks advise to cut water for citrus trees like lemons or oranges when it's in bloom (to avoid fruit dropping), daily watering even during blooming doesn't seem to affect the fruiting rate of the kumquat.

Also after it fruits, you could snip off some the top of some branches. And give it some fertilizer. This helps the tree multiply and develop new branches. From observation, the new branches may give fruits but the older ones may not.

If you would like another try with fertilizer, check out banana GE. It's sort of like an organic fertilizer tea you can make at home for the kumquat. Helps with branching and fruiting. You can apply this stuff every 7-10 days. About 6ml per liter or 3-4 tsp per gallon of water will be good enough.

I have a post about it here if you'd like a look later: How to Make Liquid Potash Fertilizer Using Banana:

Liquid Potash Fertilizer for Flowering Plants: How to Make
Let’s see how to make liquid potassium fertilizer from bananas, both meat & peels. We’ll base our process on the GE-making process. It’s really easy to do. Let’ jump in on the fun. First, we need to prepare a few different ingredients: Ingredients: * 2 bananas * 100 gr / half cup sugar * 1L

I'm not sure if this is of any help. But hope it informs! See you again next time.

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