Which vegetables can grow in water?

Which vegetables can grow in water?

Lettuce, bok choy, celery, cabbage, green onions, and several other vegetables can produce new leaves when their bases are placed in water. However, to grow a complete plant over the long term, nutrients generally need to be added: this is the principle of hydroponics.

That is the essential distinction.

Regrowing a lettuce stump in a glass of water and growing a full head of lettuce hydroponically are not exactly the same thing.

In the first case, the plant partially uses the reserves already present in the piece of vegetable.

In the second, you provide it with water, oxygen, nutrients, and light to actually continue its development.

Which vegetables can you regrow in a simple glass of water?

Certain vegetables are particularly fun to restart from kitchen scraps.

The University of Nevada Extension specifically cites:

• romaine lettuce;
• bok choy;
• cabbage;
• celery;
• carrot tops;
• turnips;
• radishes;
• beets.

For lettuce, bok choy, or celery, for example, you simply need to keep the base and place it in a small amount of water. New leaves may appear from the center.

Green onions are also very simple to restart: Illinois Extension recommends keeping their base with the roots and placing it in a shallow container containing water.

It is easy, visual, and very practical for understanding how a plant grows back.

But there is a limit.

A lettuce in a glass of water will not necessarily produce a whole new head of lettuce

A lettuce base can produce new, small leaves.

This does not mean that it will indefinitely rebuild a large head of lettuce identical to the one you originally bought.

The University of Nevada specifically points out that romaine lettuce placed back in water produces small leaves, but not necessarily a new, complete head.

The same goes for a carrot.

You can grow the greens back from the top of the carrot.

You will not regrow a new, large carrot root just in a glass of water.

Why?

Because water alone does not provide all the elements a plant needs for the long term.

That is where hydroponics comes in.

Which vegetables can actually be grown in water using hydroponics?

In hydroponics, roots grow without soil but have access to a nutrient solution, meaning water containing the mineral elements necessary for the plant.

Oklahoma State University cites common hydroponic crops such as:

lettuce, tomatoes, cucumbers, and peppers.

For a small indoor vegetable garden, leafy vegetables are generally the easiest.

Illinois Extension particularly recommends lettuce, kale, and spinach for beginners: they grow quite fast and take up relatively little space. Tomatoes can also grow hydroponically, but require more time and space.

In other words:

In a glass of water: you can restart certain vegetables for a time.

In a hydroponic system: you can nurture a plant from seed to harvest by providing the necessary water and nutrients.

→ Read our guide on vegetables to grow hydroponically

Do roots have to be placed directly in water?

Not always.

The word hydroponics means growing without soil, but that does not necessarily mean the entire plant floats in a tub of water.

Systems can use different media to support the roots: growing baskets, germination sponges, coconut fiber, expanded clay, or other suitable substrates.

Oklahoma State University defines hydroponics as growing in a liquid nutrient solution with or without an artificial support.

In a small indoor vegetable garden, a seed can, for example, germinate in a sponge placed in a growing basket, while the roots then grow toward the nutrient-rich water.

The soil is gone.

But the plant remains supported and nourished.

Which vegetables should you choose if you want to try it at home?

For a very simple first experience using only a glass of water:

green onions, lettuce, celery, or bok choy.

You will quickly see new shoots appear.

To go further and actually grow to harvest in a hydroponic vegetable garden:

lettuce, spinach, bok choy, and other leafy vegetables are generally the simplest.

Then come more ambitious crops like tomatoes, peppers, or cucumbers, provided you have enough light and space.

→ Discover Belverdia hydroponic vegetable gardens

In summary: which vegetables grow in water?

To regrow kitchen scraps in water: lettuce, bok choy, celery, cabbage, and green onions are among the simplest options.

To actually grow without soil: lettuce, spinach, kale, bok choy, tomato, pepper, and cucumber can be grown hydroponically.

The difference comes down to one thing:

a glass of water allows a vegetable to start growing again. A hydroponic solution provides it with what it needs to continue growing.