Plants That Grow In Water

Hydroponic gardening allows you to grow lettuce, herbs, and even tomatoes using only nutrient-enriched water. If you are looking for a clean, soil-free way to garden, there are many plants that grow in water perfectly well. You don’t need a big backyard or fancy equipment to start your own water-based garden today.

Growing plants in water is a fantastic method for small spaces, apartments, or offices. It also reduces the risk of soil-borne pests and diseases. You can watch the roots develop clearly through glass jars or vases, which is both educational and beautiful.

In this guide, we will cover the best options for indoor water gardening. We will also explain how to switch your favorite plants from soil to water. You will learn the simple steps to keep your plants healthy and thriving without a single scoop of dirt.

There are dozens of species that adapt well to a water-only environment. Some plants are naturally aquatic, while others simply grow roots that can survive submerged. The key is to provide the right nutrients and light conditions for each type.

Below, we have divided the best plants into easy categories. This will help you choose the right ones for your home or office. We will also give you care tips for each group so you can avoid common mistakes.

Easy Herbs For Water Growth

Herbs are among the most rewarding plants to grow in water. They grow quickly, smell great, and you can use them in your cooking right away. Many common kitchen herbs will root in a glass of water within a week or two.

Basil: Take a 4-6 inch cutting from a healthy plant. Remove the lower leaves and place the stem in water. Keep it in a sunny window.
Mint: Mint grows aggressively in soil, but it behaves well in water. Use a cutting with a few nodes submerged. It will root fast.
Oregano: This herb prefers a bit of warmth. Change the water every few days to prevent stagnation.
Stevia: A natural sweetener that roots easily in water. Give it bright, indirect light.
Lemon Balm: Related to mint, it grows well in water and has a calming scent.

When growing herbs in water, you must change the water frequently. Stagnant water can become cloudy and develop bacteria. A good rule is to change the water every 3 to 5 days.

You should also use a clear container so you can monitor root health. If you see brown or slimy roots, that is a sign of rot. Trim the affected parts and change the water immediately.

Leafy Greens That Thrive In Water

You might be surprised to learn that you can regrow leafy greens from kitchen scraps. This is a great way to reduce waste and have fresh salad greens on hand. These plants do not need soil to regenerate their leaves.

Lettuce: Save the bottom core of a head of romaine or butter lettuce. Place it in a shallow bowl with water covering the bottom inch.
Celery: Cut the base of a celery bunch and place it in water. New stalks will emerge from the center.
Bok Choy: Similar to celery, the base will regrow leaves in about a week.
Green Onions: Place the white roots in a jar with water. They will regrow to full size in 7-10 days.
Cabbage: The core of a cabbage head can sprout new leaves in water.

These greens are not true hydroponic plants because they will eventually run out of energy. However, they provide a few harvests before you need to compost them. For continuous growth, you need to add a liquid fertilizer to the water.

Use a balanced hydroponic nutrient solution at half strength. This gives the plants the minerals they need to keep producing new leaves. Without nutrients, the growth will slow down and stop.

Popular Houseplants For Water

Many popular houseplants are actually semi-aquatic in nature. They grow along riverbanks in the wild, so they are used to having their roots wet. This makes them perfect candidates for water culture.

Pothos (Devil’s Ivy): This is the easiest plant to grow in water. It roots within days and grows long, trailing vines.
Spider Plant: The plantlets (baby spiders) root easily in water. They make great gifts.
Lucky Bamboo: Technically not bamboo, this plant is sold in water vases. It needs very little care.
Philodendron: Heartleaf philodendron grows well in water and tolerates low light.
Chinese Evergreen: This plant has beautiful variegated leaves and adapts to water culture well.
Peace Lily: You can grow peace lilies in water, but they need more nutrients to bloom.

To start a houseplant in water, take a cutting with at least one node. The node is where the roots will emerge. Place the cutting in a jar with the node submerged but the leaves above the waterline.

Change the water weekly for these plants. They are more tolerant than herbs, but they still need fresh oxygen. Use room-temperature water to avoid shocking the roots.

Ornamental And Flowering Plants

You can also grow flowering plants in water, though they may require more attention. Some aquatic plants are naturally suited for this. Others will bloom if you provide the right conditions.

Water Hyacinth: This is a free-floating aquatic plant with beautiful purple flowers. It grows fast and is great for ponds.
Water Lettuce: Not a true lettuce, this plant floats on the surface and has velvety leaves.
Lotus: You can grow lotus in a large container of water. They need plenty of sunlight and a warm environment.
Paperwhites: These are bulbs that you can force to bloom in a vase of water with pebbles.
Amaryllis: Another bulb plant that can grow in water, producing large, showy flowers.

For flowering plants, light is crucial. Most of them need at least 6 hours of direct sunlight per day. If you do not have a sunny window, you may need to use a grow light.

Nutrients are also important for flowering. Use a fertilizer that is higher in phosphorus (the middle number on the label). This encourages blooming instead of just leaf growth.

How To Transition Soil Plants To Water

You do not have to start from cuttings. You can take an existing potted plant and move it to water. This process requires a bit of patience, but it is very doable. Here is a step-by-step guide.

Remove the plant from its pot: Gently loosen the soil and lift the plant out. Be careful not to break too many roots.
Wash the roots: Rinse the roots under lukewarm running water to remove all soil. Be thorough, as leftover dirt can cause rot.
Trim damaged roots: Use clean scissors to cut away any brown, mushy, or dead roots. Healthy roots are white or light tan.
Place in a container: Choose a glass jar or vase that is large enough to hold the roots. Fill it with clean, room-temperature water.
Monitor for shock: The plant may droop for the first week. This is normal. Keep it in indirect light and change the water after 3 days.
Add nutrients: After two weeks, add a diluted liquid fertilizer to the water. This helps the plant recover.

Not all plants will survive this transition. Plants with very fine, delicate root systems often struggle. However, hardy plants like pothos, philodendron, and spider plants usually adapt quickly.

One common mistake is to leave the water level too high. Only the roots should be submerged. The stem and leaves should stay dry to prevent rot.

Best Water Types And Containers

The type of water you use matters more than you might think. Tap water contains chlorine and fluoride, which can harm sensitive plants. Let the water sit out for 24 hours to allow the chlorine to evaporate.

Alternatively, you can use filtered water or rainwater. Rainwater is actually the best because it contains natural minerals. If you collect rainwater, make sure it is clean and free of debris.

For containers, clear glass is the most popular choice. It allows you to see the roots and monitor water levels. However, algae can grow in clear containers when exposed to light. To prevent this, use a dark glass container or wrap the jar in paper.

Here are some container ideas:

Mason jars
Glass vases
Bottles with narrow necks (for single cuttings)
Aquariums or fish tanks
Ceramic pots with no drainage holes

Make sure the container is clean before you add the plant. Wash it with warm soapy water and rinse well. This prevents the introduction of harmful bacteria.

Nutrient Solutions And Fertilizers

Water alone does not contain the nutrients plants need to grow long-term. You must add a fertilizer. Hydroponic nutrient solutions are specifically designed for this purpose. They contain a balanced mix of nitrogen, phosphorus, potassium, and trace minerals.

You can buy liquid hydroponic fertilizer at most garden centers or online. Look for a product that is labeled for “hydroponics” or “soilless growing.” These are usually sold in two parts (A and B) that you mix together.

When using fertilizer, follow the instructions on the label. It is better to under-fertilize than to over-fertilize. Too much fertilizer can burn the roots and turn them brown.

A simple schedule is to add fertilizer every time you change the water. Use a half-strength solution for most houseplants. For leafy greens, you can use a full-strength solution.

Light Requirements For Water Plants

Light is the most critical factor for plant growth. Without enough light, plants cannot photosynthesize, even if they have water and nutrients. Most water-grown plants need bright, indirect light.

Place your containers near a north or east-facing window. If you only have a south or west window, use a sheer curtain to filter the intense afternoon sun. Direct sunlight can heat the water and cause algae growth.

If you do not have good natural light, invest in a grow light. LED grow lights are energy-efficient and provide the full spectrum of light plants need. Keep the light on for 12-14 hours per day.

Watch for signs of insufficient light. If the stems become leggy (long and thin) or the leaves turn pale, move the plant to a brighter spot.

Common Problems And Solutions

Even with the best care, you may encounter issues. Here are the most common problems with water-grown plants and how to fix them.

Algae Growth

Algae turns the water green and can coat the roots. It happens when the container is in direct sunlight. To fix this, move the plant to a shadier spot. You can also use an opaque container to block the light.

Root Rot

Brown, slimy roots indicate rot. This is caused by bacteria in the water. Remove the plant, trim the rotten roots, and wash the healthy ones. Clean the container thoroughly and use fresh water.

Yellow Leaves

Yellow leaves can mean overwatering (ironic in water) or a nutrient deficiency. Check the water level. Only the roots should be submerged. Also, ensure you are adding fertilizer regularly.

Slow Growth

If your plant is not growing, it likely needs more light or nutrients. Move it to a brighter location and add a half-strength fertilizer solution.

Frequently Asked Questions

Can any plant grow in water?

No, not all plants can grow in water. Some plants have root systems that require oxygen from the soil. However, many common houseplants, herbs, and vegetables can adapt to water culture.

How often should I change the water?

You should change the water every 3 to 5 days for herbs and leafy greens. For houseplants, you can change it weekly. If the water looks cloudy, change it sooner.

Do I need to use a special fertilizer?

Yes, you should use a liquid hydroponic fertilizer. Regular soil fertilizer may not dissolve properly and can leave residue. Hydroponic nutrients are formulated for water uptake.

Can I grow vegetables in water?

You can grow leafy vegetables like lettuce and spinach in water. You can also regrow celery and bok choy from scraps. Fruiting vegetables like tomatoes and peppers are harder and need a more advanced hydroponic setup.

Why are my plant roots turning brown?

Brown roots usually indicate root rot. This is caused by bacteria or a lack of oxygen. Trim the brown roots, clean the container, and change the water. Make sure the water level is not too high.

Final Tips For Success

Growing plants in water is a rewarding hobby that is easy to start. Begin with a simple plant like pothos or a green onion scrap. Once you see how easy it is, you can expand your collection.

Keep a regular schedule for changing water and adding nutrients. This is the most important habit to develop. Consistency will prevent most problems before they start.

Do not be afraid to experiment. Try different plants and different containers. You will quickly learn what works best in your specific environment. The joy of watching roots grow in a clear jar is something you will never get tired of.

Remember that some plants will grow faster than others. Be patient and observe your plants daily. They will tell you what they need through their leaves and roots. With a little attention, your water garden will flourish.

So grab a jar, take a cutting, and start your own water garden today. It is a clean, simple, and fascinating way to bring more greenery into your life. You might find that you prefer it to traditional soil gardening.