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Hydroponic Gardening: Selecting & Caring for Plants

Hydroponics is an innovative gardening method that allows you to grow plants without soil. By providing plants with the right nutrients and growing conditions, hydroponics can yield bountiful harvests with minimal space and resources. In this article, we’ll guide you through selecting the ideal plants for your hydroponics garden and provide tips for their care and harvesting.

Plants Suitable for Hydroponics Gardening

Not all plants are suitable when it comes to hydroponics. Some plants thrive in this soil-less environment, making them perfect candidates for your hydroponics garden. Let’s explore a few of these plants in more depth:

Leafy Greens

Lettuce, spinach, kale, Swiss chard, and arugula are excellent choices for hydroponics. They have shallow root systems and grow quickly, making them perfect for small-scale hydroponic setups. Lettuce varieties like Butterhead, Romaine, and Bibb are particularly well-suited for hydroponics. Spinach and kale are nutrient-dense greens that can be harvested as baby leaves or mature plants.


Basil, mint, parsley, cilantro, and chives are popular herbs that flourish in hydroponic gardens. They require moderate lighting and a consistent nutrient supply, making them a joy to grow indoors. Basil, in particular, is a versatile herb that thrives in hydroponic systems and can be used in various culinary delights. Mint, with its refreshing aroma, is known for its vigorous growth in hydroponic setups.

Tomatoes and Peppers

These fruiting plants can also be successfully grown hydroponically. Compact varieties like cherry tomatoes and dwarf peppers are ideal for limited space. Tomatoes, such as the flavorful Cherry or Grape varieties, can be trellised or supported with stakes.


These delightful fruits thrive in hydroponic systems, hanging baskets, or vertical towers. Strawberry plants can be grown from bare-root runners or young plants and provide a delicious yield of sweet berries.


With their vining growth habit, cucumbers can be trained to grow vertically in hydroponic systems. Varieties like English cucumbers or mini cucumbers are well-suited for hydroponics. They require ample light, support for their climbing vines, and regular pollination to ensure fruit set.


Microgreens are young, tender seedlings harvested at the cotyledon or first true leaf stage. They are packed with flavour and nutrients, making them a popular choice for hydroponic growers. Microgreens can include a wide range of plants, such as radish, broccoli, sunflower, and pea shoots. They are quick to grow and provide a beautiful and nutritious addition to salads, sandwiches, and garnishes.


While not typically thought of as hydroponic crops, certain flowers can thrive in this system. Marigolds, nasturtiums, and pansies are examples of edible flowers that can be grown hydroponically.

Ideal Growing Conditions, Nutrient Requirements, and Care Tips

To ensure the success of your hydroponic garden, it’s essential to provide the right growing conditions and nutrients for each plant. Here are some key factors to consider:


Most plants require 14-16 hours of light per day for optimal growth. If you’re growing indoors, you can use LED grow lights tailored to the specific light spectrum needed for each plant. Position the lights at an appropriate distance from the plants to avoid heat damage or light burn. Adjust the light duration and intensity based on the plant’s growth stage.

Temperature and Humidity

Maintaining the right temperature and humidity levels is crucial for the success of your hydroponic garden. Most plants thrive in temperatures between 65-75°F (18-24°C). It’s important to provide adequate airflow and ventilation to prevent temperature fluctuations and reduce the risk of fungal or mould growth. Maintaining humidity around 50-70% helps ensure healthy plant development.

Nutrient Solution

Hydroponic plants rely on a nutrient solution for their growth and development. You can purchase pre-mixed hydroponic nutrient solutions or create your own using a balanced blend of macronutrients and micronutrients. Macronutrients include nitrogen (N), phosphorus (P), and potassium (K), while micronutrients encompass essential elements like iron, calcium, and magnesium. Follow the manufacturer’s instructions or consult a hydroponic gardening guide to determine the appropriate nutrient concentration and frequency of application for your chosen plants.

pH Levels

Monitoring and maintaining the correct pH level of the nutrient solution is vital for optimal nutrient absorption. Most plants prefer a pH range of 5.5-6.5. Regularly test the pH level of your solution using a pH testing kit or meter. Adjust the pH by adding pH-up or pH-down solutions as needed. Aim to keep the pH within the desired range to avoid nutrient deficiencies or toxicities that can hinder plant growth.

Water Quality

The quality of water used in your hydroponic system plays a significant role in plant health. It’s recommended to use filtered or purified water to prevent the accumulation of minerals or contaminants that could harm the plants. Avoid using chlorinated water, as chlorine can negatively affect the beneficial microbes in the nutrient solution.

Oxygenation and Aeration

Ensuring adequate oxygenation and aeration of the root zone is essential for healthy plant growth. Oxygen helps plants absorb nutrients and prevents root rot. Consider incorporating an air stone or diffuser into your hydroponic system to supply oxygen to the nutrient solution and promote robust root development.

Plant Combinations and Companion Planting

In hydroponic systems, combining plants that have similar nutrient requirements can maximize your garden’s efficiency. For example, lettuce and herbs like basil or parsley make great companions, as they share similar nutrient needs and grow well together. Additionally, some plants can help repel pests or attract beneficial insects when grown together, enhancing your garden’s health.

Caring for Your Hydroponics Plants

Regular maintenance is key to keeping your hydroponics garden thriving. Here are some care tips:

Monitor Nutrient Levels

Regularly check the nutrient levels in your hydroponic system to ensure your plants are receiving the right balance of essential elements. Follow the instructions provided with your nutrient solution and adjust the levels as needed. Remember, different plants may have varying nutrient requirements, so it’s crucial to cater to their specific needs.

pH Level Maintenance

Maintain the proper pH level of your nutrient solution to ensure optimal nutrient absorption by the plants. Regularly test the pH using a pH meter or test kit. If the pH drifts outside the desired range (5.5-6.5 for most plants), adjust it by adding pH-up or pH-down solutions as necessary.

Watering and Feeding

Unlike traditional soil-based gardening, hydroponic plants rely solely on the nutrient-rich water solution for their growth. It’s important to maintain a consistent watering schedule and ensure that the roots are adequately submerged or sprayed with the nutrient solution. Avoid overwatering, as it can lead to root rot. Additionally, as the water evaporates, regularly top up your system to maintain the desired nutrient concentration.

Air Circulation and Ventilation

Proper airflow is essential for hydroponic gardens to prevent the growth of mould and other harmful pathogens. Consider installing fans or an exhaust system to ensure adequate ventilation. This will help maintain a healthy environment for your plants and minimize the risk of disease.

Lighting Requirements

Providing the right amount and quality of light is crucial for your hydroponic plants’ growth. LED grow lights are the most popular choice for hydroponics due to their energy efficiency and the ability to emit the specific light spectrum plants need for photosynthesis. Position the lights at the correct distance from the plants, typically 12-18 inches, to avoid heat stress or light burn.

Pest and Disease Management

While hydroponic gardens are generally less prone to pests and diseases than traditional soil gardens, it’s still essential to be vigilant. Inspect your plants regularly for signs of pests, such as aphids or whiteflies. If detected, treat the affected plants promptly with organic insecticides or other appropriate methods. Also, maintain cleanliness in your hydroponic system by regularly cleaning and sanitizing equipment to prevent the buildup of harmful bacteria or algae.

Pruning and Training

Depending on the plants you’re growing, pruning and training may be necessary. Regularly remove dead or yellowing leaves to promote better air circulation and prevent the spread of diseases. Some plants, like tomatoes, may require staking or trellising to support their growth and ensure proper development.

System Maintenance

To keep your hydroponic system functioning optimally, it’s important to conduct regular maintenance. Clean the reservoir, channels, and any other components of your system to prevent clogs, algae growth, or the accumulation of debris. Follow the manufacturer’s instructions or consult online resources for specific cleaning guidelines.

Harvesting Your Hydroponics Crops

One of the most rewarding aspects of hydroponic gardening is the joy of harvesting your own fresh produce. Here are a few tips for a successful harvest:

Timing is Key

Each plant has its own growth cycle and specific harvesting times. Pay attention to the recommended harvesting period for each crop. Harvesting too early may result in underdeveloped flavours while waiting too long can lead to overripe or woody produce.

Leafy Greens

Harvest leafy greens like lettuce, spinach, kale, and Swiss chard by gently removing the outer leaves, allowing the inner ones to continue growing. This method, known as “cut-and-come-again,” ensures a continuous supply of fresh greens throughout the growing season.

Fruiting Plants

Tomatoes, peppers, and strawberries are popular hydroponic crops that produce delicious fruits. Tomatoes are ready for picking when they reach their full colour and firmness. Gently twist or cut the stem to harvest the ripe tomatoes. Peppers should also be picked when they reach their mature colour and size. Use shears or a sharp knife to cut the stem near the fruit. As for strawberries, harvest them when fully ripe and red. They tend to have a shorter shelf life, so enjoy them promptly.


When it comes to harvesting herbs like basil, mint, parsley, and cilantro, you can start snipping off individual leaves or small sprigs as needed. Regular pruning encourages bushier growth and prolongs the herb’s productivity.

Proper Handling

After harvesting, handle your hydroponic crops with care. Place them gently in a clean container or basket to avoid bruising or damaging the produce. Avoid excessive handling or squeezing, as it can lead to spoilage.

Storage and Freshness

Hydroponic crops are best enjoyed fresh, but if you need to store them, follow these guidelines:

  • Leafy greens: Rinse the leaves gently and store them in a perforated plastic bag or airtight container in the refrigerator. They will stay fresh for a few days.
  • Fruiting crops: Tomatoes and peppers are best stored at room temperature until fully ripe. Once ripe, refrigerate them to slow down the ripening process. Strawberries should be consumed or refrigerated immediately to preserve their freshness.
  • Herbs: Treat herbs like freshly cut flowers. Trim the stems and place them in a glass of water, covering the leaves with a plastic bag, and refrigerate. This method can keep herbs fresh for up to a week.

Enjoying the Fruits of Your Labor

The best part of harvesting your hydroponic crops is savouring the flavours and nutrition of your homegrown produce. Whether you use them in salads, smoothies, stir-fries, or other culinary creations, you can take pride in knowing that you cultivated them with care.


Hydroponic gardening offers an exciting and efficient way to grow plants without soil. By selecting the right plants, providing optimal growing conditions, and understanding their specific needs, you can enjoy a bountiful harvest right at your fingertips. Remember to experiment, learn from your experiences, and have fun as you embark on your hydroponic gardening journey.

Updated on August 24, 2023

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