How To Grow A Hydroponic Avocado (Complete Guide)

Are you wanting to grow a hydroponic avocado?

These wonderful fruits, rich in healthy fats, vitamins, and fiber can be used in guacamole, on toast, and even in some desserts. It’s no wonder that many people out there are wanting to grow their very own avo trees at home.

In this article, we’ll discuss whether or not it’s possible to grow these awesome fruits hydroponically, and if so, how you’d go about doing it.

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What is a Hydroponic Avocado?

In short, a hydroponic avocado is an avocado that’s been grown in a hydroponic system.

For those of you who aren’t yet familiar with hydroponics, here’s a brief summary of the concept:

Hydroponic growing is the use of a nutrient-rich, water-based solution in place of soil as a growing medium for plant propagation.

With this method, nutrients that have been added to the solution are fed directly to your plants.

While this takes place, your plants can access ample amounts of oxygen, allowing for greater quality produce and noticeably less time between your yields.


Can An Avocado Be Grown Hydroponically?

Yes, it is possible for you to grow avocados hydroponically. However, you’ll find that most people choose not to, mainly because of their size.

At full maturity, this fruit-bearing tree can reach heights of 15 to 20 feet with a width of 5 to 8 feet. When grown in a container, they can reach heights of between 5 – 7 feet.

But, as the old adage goes, “where there’s a will, there’s a way”.

Several avocado seedlings in old buckets that were converted into a hydroponic system.
The above image shows several avocado seedlings in old buckets that were converted into a hydroponic system.
Source: FCS Quaker Makers

Before You Grow Your Hydroponic Avocado

Before we go any further there are two very important facts you should know:

  • Avocado trees take quite some time to bear fruit.
  • They do not grow true to seed.

How Long Do they Take To Bear Fruit?

According to California Avocados, if you decide to plant a cloned seedling, expect to wait 3-4 years for fruit to appear. If however, you start from a seed, you’ll be waiting a fair bit longer – it can take anywhere from 5-13 years until your tree is mature enough to set fruit.

Girdling

If you’re confident enough to do so you can girdle your avocado tree. Girdling is a practice that people use to increase fruit productivity in fruit trees.

It is a simple process of cutting through and removing the bark in a 2 cm diameter circular pattern around one-third of the limbs per year. In the case of avocado trees, this practice not only increases the yield of a tree but can also ‘shock it’ into producing fruit.

Please Note: Do this at your own risk and only consider doing it once your tree has had enough years to mature and establish a solid root system.

True to Seed

Avocados don’t produce true to seed, meaning you won’t get the same type of fruit as the avocado from which the pit came.

Commercial avocado trees are propagated from cuttings. Cuttings of one variety are grafted onto the rootstock of another variety to produce the best outcome.

So if you’re looking to grow an avocado tree for the purpose of eating the fruit, it’s best that you purchase a seedling from a nursery rather than using any old avocado seed.


Tools Needed To Grow A Hydroponic Avocado

To grow your very own hydroponic avocado tree, you’ll need the following:

(All products are sourced from Amazon.)

Be sure to check out our latest article covering pH balance for hydroponics.

How To Grow A Hydroponic Avocado From Seed

If you do choose to grow an avocado from seed, here are the steps to follow using the toothpick and water method:

Step 1: Prep Your Seed

Peeling off the flesh of an avocado seed.
Peeling off the flesh of an avocado seed.
Source: Project Diaries (Youtube Channel)

Carefully remove the pit from the avocado. Gently rinse the seed to remove any remaining flesh still present.

This can be rather difficult, so to make it easier you can soak the seed in lukewarm water for 10 minutes or so to soften the flesh. Be careful when removing the flesh so as not to damage your seed.

Step 2: Toothpick Time

Observe your seed and determine the top and bottom sides of it.

The top part (slightly pointier) is where the stem will emerge from while the bottom part (slightly flatter) is where the roots will emerge from.

Once you’ve figured this out, insert 2-4 toothpicks at a 45° angle around the outer edges of your seed. Avoid the ‘fault lines’ that you’ll see in your pip while doing so.

Learn how to make your own DIY hydroponic nutrients here.

Step 3: Add Water

The trick here is to keep the bottom of your seed moist. To do this, insert your seed into the top of a drinking glass, or jar. Use the toothpicks as support to hold the seed near the top of the container – half-submerged.

The bottom of the seed must stay moist to produce roots, so add water as needed to replenish the reservoir.

An avocado seed suspended above a glass filled with water.
An avocado seed suspended above a glass filled with water.
Source: Avo Seedo

Step 4: Let The Waiting Begin

At this stage, you’ll want to place your seed in a spot that’s both warm and bright, but avoid putting it into direct sunlight just yet, changing the water once a week or whenever it becomes cloudy.

Before the seed starts to sprout, the top of the seed begins to dry out, the outer brown covering falls off and the pit splits open from the bottom.

Eventually, a small root emerges from the bottom of the pit. The root grows first and a shoot appears later, rising from the top of the pit.

Once the root begins to form, do not let the water level drop. Remember, roots need to be submerged to survive.

A root that has emerged from an avocado seed.
A root that has emerged from an avocado seed.
Source: Reddit

Step 5: Prune, Then Plant Avocado Seedling

When the avocado stem grows to at least 8-inches tall, it’s time to cut it back by about 3-inches. This causes the plant to branch out and become bushier.

When the plant is around 6 inches tall again, it’s time to transplant your seed into your chosen hydroponic setup.

Personally, we recommend one of the following systems:

Step 6: Grow and Pinch

Continue to pinch your plant as it continues to grow, but again make sure that it’s at least 8 inches tall when you do so.

Also, be sure to water frequently enough to keep the soil moist. Never allow your avocado to dry out so much that its leaves wilt.

Check out our article covering our most recommended grow tents for beginners.

Tips For Growing An Avocado Hydroponically

There are a number of tips that you can make use of that’ll make your life much easier when growing avocados hydroponically. If you apply these tips along with the information from the previous sections, you’ll set yourself up for success.

Increase Pollination

Firstly, an avocado tree has both functional male and female organs. The male floral organ (stamen) which produces pollen is comprised of the anther and filament. The female floral organ (pistil) which receives the pollen is comprised of the stigma style and ovary.

A Diagrammatic representation of the female and male phase flowers in avocado.
Source: My Avocado Trees

What’s more, avocado trees have very unique flowers that exhibit a type of flowering behavior known as “synchronous dichogamy”. This is the simultaneous change in sex phases of all flowers in an inflorescence or entire plant.

Let’s dive into this incredibly fascinating process a little, shall we?

Changing of the Sexes

During synchronous dichogamy, an individual flower will open for two days and the timing of the male and female phases is distinct.

There are two flowering types:

  • Type A – These varieties open as female on the morning of the first day. The flower then closes in late morning or early afternoon. It will remain closed until the afternoon of the second day when it opens as male.
  • Type B – These varieties open as female on the afternoon of the first day, close in late afternoon and re-open as male the following morning.

So, what is the result of this flowering behavior? It helps to promote cross-pollination since the male and female phases of an individual tree occur at different times.

Avocado varieties and flowering types.

The Bottom Line

What we’re trying to get at here is simply this – while avocado trees can in fact self-fertilize and produce fruit, your yields should increase if you grow both a Type A and Type B avocado tree

Temperature Requirements

According to the UC Master Gardener Program of Contra Costa, your avocado trees will be at their best in moderately warm temperatures ( 60‒85 °F/15-29 °C) with moderate humidity.

Your optimum fruit set will occur from 65‒75 °F (18-23 °C).

Take Extra Care

The avocado is a shallow-rooted tree with most of its feeder roots in the top six inches of the soil, so you’ll need to provide it with good aeration.

Additionally, its root system is very sensitive, so take great care not to disturb it when transplanting.

pH Requirements

The general consensus appears to be a pH level of between 5 – 7.

However, UC’s Master Gardener Program states that “avocado trees like the pH of the soil to be about 6‒6.5.”

When And Where To Plant

For those of you looking to grow your hydroponic avocados outdoors, you’ll want to them at the beginning of Spring. If you plant them during the summer, there is a risk of sun damage. This is because avocado trees don’t absorb water very well when they are young.

You’ll also want to plant your trees in a spot that’s protected from both wind and frost – planting in full sun is ideal as these trees thrive in bright, direct, and unfiltered sunlight.

Dwarfing Your Tree

You’ll recall that we discussed the potential size of an avocado tree – they aren’t exactly small. As such, they aren’t naturally made for hydroponic setups, so you’ll want to dwarf your tree to make the process more manageable.

To do this, you’ll need need to restrict the following:

  • Grow space
  • Availability of water
  • The amount of nutrients

This is easier said than done because ideally, you want your tree to grow as quickly as possible while also stunting its growth and making sure that it doesn’t wither and die.

Early on, the growing container should be as small as possible, but large enough to house the plant for its first 12-months. You’ll want to start off with an 18″ (45cm) container – this will increase as time goes on.

Once the roots are well-formed, you can move your tree to a 5-gallon (20-25L) sized container. Keep in mind that your growing space will determine the final size of your tree, so make it manageable for yourself.

Pinching To Reduce Size

Aside from restricting the above elements, you’ll also need to pinch your tree when necessary. This process helps keep your tree fuller and shorter.

In order to do this, pinch the central stem back to the topmost bud as soon as it gets at least 8 inches tall – this is the stem that will later develop into a trunk. In short, this will keep the tree from growing upwards.

As long as you leave an 8-inch length of the stem, you can cut up to half the length of it.

Here is a short but informative video that demonstrates how to pinch your plant, as well as the effects of pinching.

Read our introduction to hydroponics with fish.

Final Thoughts

It’s safe to say that avos aren’t exactly the easiest fruit to grow hydroponically. However, it is entirely possible. With a bit of know-how, a little love, and a lot of patience, you’ll be well on your way to growing your own avocado tree!

If you’ve managed to grow your own hydroponic avocado trees, please feel free to share your experience with us in the comment section below.

Robert Wortrich

Robert Wortrich

Robert is a content creator and editor. His passion for researching and the environment led him to joining the Climatebiz team. When he isn’t busy writing articles or learning more about everything Green Technology-related, you’ll find him spending time with friends or hiking one of the many wonderful trails that his home – Cape Town – has to offer.

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