Do Olive Trees Need Fertilizer? (Explained)

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  • Post category:Olive Trees
  • Post last modified:February 3, 2022
bag with fertilizers for plants

You have probably heard that olive trees are tough plants that’ll tolerate poor growing conditions. In fact, they’re more durable than most other fruit plants. Because of that, I often got questions such as „do olive trees need fertilizer?“. That’s the reason why I’m writing this article, to show you whether olive trees need fertilizers or not.

Even though olive trees are very tolerant trees and can grow in poor growing conditions, they still need fertilizers in order to grow healthy and produce a bunch of fruit every year. If you want the best and healthiest olive tree, and also want to harvest plenty of fruits every year, you should fertilize them.

As you can see, fertilizing olive trees is important if you want a healthy, long-living tree that produces olives every year. There’s no soil that has all the nutrients needed for healthy growth, and we need to fill in the gaps.

Why You Should Fertilize Olive Trees

Without proper nutrients, no plant can grow to its maximum. The same situation is with olive trees. Plants, when lacking nutrients, will try their best to get more nutrients from the soil (developing roots), instead of growing trunk, branches, and of course, bearing fruits.

Reasons why you should fertilize olive trees:

  • Fertilizer will supplement the lack of nutrients in the soil
  • Those nutrients will make soil an ideal place of growth for the trees
  • Olive trees will grow quicker and healthier
  • It can help olive trees to stay pest-free
  • Olive trees will produce more fruit
  • Feeding olive trees will extend their lifetime

Not only the tree will be healthy, but you’ll also be happy with the results of fertilization. When olive trees grow properly, without some diseases, and bear plenty of fruit every year, we, olive growers, are the happiest. We’ll get a bunch of fruit, with which we can make olive oil and other products made of olives.

Again, there’s no place on Earth where the soil has the exact amount of nutrients olive trees need for proper growth. Luckily, we can easily change that by fertilizing them regularly.

No rich harvests have ever happened without proper care for olive trees, so keep that in mind.

How Often To Fertilize Them

Olive trees don’t need fertilizers very often. Many olive growers do it only a couple of times a year. On the other hand, people that grow olive trees in pots, probably do it more often, but in smaller portions. Since my goal with this site is to encourage people to grow olives in the ground, I’ll mainly concentrate on that.

There are 5 main types of olive tree fertilization processes:

  • Basic olive tree fertilization (fills the soil with basic nutrients)
  • Supplementary olive tree fertilization (stimulates quicker growth of the tree and prepare it for flowering)
  • Foliar fertilization (specific nutrients for the best possible fruit yield and quality, as well as pest prevention)
  • Organic fertilization (keeps the soil fertile for a long time, replenishes many important nutrients)
  • Reclamation fertilization (stimulates the initial growth of newly-planted olive trees)

Basic and supplementary fertilization are the main processes and should be done every year (for mature trees). These two processes will feed the tree with the most important nutrients for healthy olive tree growth, and great olive yield.

Each of these fertilization processes is performed at different times of the year, and to make it easier for you, I made a comprehensive table in which I’ll show you the basic nutrients used in each method, as well as the ideal time of fertilization. Check it below.

Basic NutrientsApplication PeriodHow Often
Basic FertilizationNPK – Nitrogen, Phosphor, PottasiumSeptember to NovemberOnce a year
Supplementary FertilizationNitrogen-rich fertilizers: UREA 46%, KAN 27%, or similarLate February and Early AprilTwo applications (1st in February, 2nd in April)
Foliar FertilizationBoron, calcium, iron, copper, magnesium, zincBefore flowering process (April and May), and after the fruit fertilization process (June). Otherwise if needed because of the plant conditions. A few times a year, depending on the tree conditions. Mostly 2-4 times a year
Organic FertilizationFertilizers from animal and plant origin (horse and cow manure mostly)In AutumnEvery 3-4 years
Reclamation FertilizationNPK (Nitrogen, Phosphor, Pottasium), and manuresOnly before planting olive treesJust once

What Type Of Fertilizers Should You Use

There are two main types of fertilizers: organic and synthetic. Both of them have both pros and cons. In my experience, I had to use both because of the micro and macronutrients difference in them, but I try to use organic fertilizers more, whenever possible.

Synthetic fertilizers will have higher amounts of nutrients, and they’ll start feeding the tree immediately (fast-acting). Also, they’re much cheaper, making them a great choice for people on a budget. The best thing about synthetic fertilizers is that you’ll often find them specifically formulated for specific kinds of trees.

The biggest con of synthetic fertilizers is that you could damage the tree if you overapply them. That’s because they have high amounts of chemical nutrients.

Organic fertilizers have smaller amounts of nutrients, but they’ll feed the tree for much longer, and they’re also great for the soil when looking long-term. If you want all the best for your olive tree’s long-term, you should aim for organic fertilizers. Even though they cost more, I think they’re worth it. Especially if you’re a small olive grower and you don’t look for the ROI (return on investment) only, but for the quality of the olive products too.

In the end, it’s up to you to decide, depending on your needs and wishes. If you wish to have completely organically grown olive trees – you know what to do. On the other hand, if you want to get the most out of the tree (yield, etc.), you’ll opt for synthetic ones.

Again, in my opinion, some mix of both is probably the best and most profitable option.

What If You Never Fertilize Olive Trees

I think that by now you already know that feeding olive trees is extremely important for their growth and yield. However, I want to quickly remind you what could happen if you never fertilize olive trees in your farm, garden, or pots.

Olive trees that aren’t fed with fertilizers may:

  • Grow very slowly
  • Develop only roots, instead of canopy (because they’ll search for nutrients in the ground)
  • They won’t yield so many fruits
  • May be more vulnerable to pests and diseases
  • Fruits won’t be full of olive oil
  • Trees won’t live as long as they could if you fertilize them

These were the most important things that could happen if you never fertilize olive trees. Of course, there are many other things, but even only a few above are more than enough to realize why fertilizing olive trees is essential.  


Fertilizing olive trees is one of the most important things you should do if you expect them to grow properly and yield many fruits every single year. In the near future, I’ll be writing guides on fertilizing olive trees, where I’ll explain each method and each step you should do, so stay tuned. Until then, here’s a great and short pdf about fertilizing olive trees.

My goal with olive trees is to keep them healthy as long as possible, and „force“ them to bear a lot of fruit, so I can make enough olive oil for my family. I suppose your goals are similar too. To accomplish those goals, many steps are needed, and fertilizing trees is one of them.

In my opinion, fertilizing olive trees is almost as important as regularly watering them. That’s how important it is.

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