Is It Better To Water Greenhouse In Morning Or Evening?

In the fascinating world of greenhouse gardening, one question that frequently arises is whether it is better to water your plants in the morning or evening. This seemingly simple query has sparked debates among horticultural enthusiasts for years, each championing their preferred watering time. As you embark on your journey to optimize plant growth and maximize yields in your own greenhouse, uncovering the benefits and drawbacks of watering in the morning versus evening becomes essential knowledge. So, let’s explore the intricacies of this subject, shedding light on the factors that can influence your watering routine and ultimately determine the health and vitality of your precious greenhouse plants.

Factors to Consider

When it comes to watering your greenhouse, there are several factors that you should take into consideration. These factors will help you determine whether it is better to water your greenhouse in the morning or the evening. By understanding these factors, you can ensure that your plants receive the optimal amount of water and create a healthy growing environment.

Natural Light Availability

One important factor to consider is the availability of natural light in your greenhouse. Natural light is crucial for photosynthesis, the process through which plants convert light energy into chemical energy to fuel their growth. By watering your plants in the morning, you can ensure that they have access to an entire day of sunlight. This allows them to maximize their photosynthetic potential and contribute to healthy growth.

Temperature and Humidity Levels

The temperature and humidity levels in your greenhouse can also play a role in determining the best time to water your plants. In the morning, the temperature is typically cooler, and the humidity levels are higher. This can be beneficial for plants as it reduces the risk of water evaporation and ensures that the water you provide stays in the soil longer, allowing the plants’ roots to absorb it more effectively.

Plant Water Absorption

Different plants have varying water absorption rates and preferences. Some plants prefer to absorb water through their roots during the day, while others thrive with water uptake during the night. Understanding the specific needs of your plants will help you determine the best time to water them. For instance, plants with fuzzy leaves, such as African violets, prefer morning watering to avoid fungal growth, as the water has the chance to evaporate during the day.

Disease Prevention

Watering your plants at the right time can also help prevent the development of diseases. When plants are watered in the morning, the leaves have a chance to dry off during the day. This reduces the risk of fungal infections and diseases caused by excess moisture on the foliage. By watering your plants in the morning, you can promote a healthier growing environment and minimize the need for chemical treatments to combat diseases.

Evaporation and Water Efficiency

Water efficiency is another critical factor to consider when deciding when to water your greenhouse. Water is a precious resource, and by watering your plants in the morning, you can minimize water evaporation during the day when temperatures are higher. This ensures that the water you provide to your plants is utilized more efficiently and reduces the frequency of watering required. By conserving water, you contribute to a more sustainable and environmentally-friendly greenhouse operation.

Morning Watering

Morning watering offers several benefits for your greenhouse plants. By providing water in the morning, you are setting your plants up for a successful day of growth and development.

Allows for Full Day of Photosynthesis

By watering your plants in the morning, you are ensuring that they have access to a full day of sunlight for photosynthesis. This process is essential for plants, as it allows them to convert light energy into the chemical energy they need for growth. Watering in the morning gives your plants the best chance to maximize their photosynthetic potential and contribute to their overall health and productivity.

Prevents Fungal Growth

Morning watering can also help prevent fungal growth on your plants. By providing water early in the day, you are giving the leaves and stems ample time to dry off before the humidity levels rise. Fungus thrives in moist environments, so by allowing your plants to dry naturally throughout the day, you can reduce the risk of fungal infections and diseases. This can help maintain the overall health and appearance of your greenhouse plants.

Minimizes Water Evaporation

Another advantage of morning watering is that it minimizes water evaporation. During the day, temperatures can rise, and the sun can be intense, causing water to evaporate quickly from the soil. By watering in the morning, you are giving your plants a head start in absorbing the water they need before the hot temperatures kick in. This reduces the amount of water lost through evaporation and ensures that your plants receive an adequate water supply throughout the day.

Evening Watering

While morning watering has its advantages, there are also reasons why you might choose to water your greenhouse plants in the evening. Evening watering offers unique benefits and can be the preferred option for certain plant species.

Protection Against Hot Temperatures

Watering your plants in the evening can help protect them from the intense heat of the day. By providing water later in the day, you are offering a refreshing and cooling effect on your plants. This can be especially beneficial in hot climates or during heatwaves when temperatures soar. Evening watering helps alleviate heat stress and ensures that your plants can withstand high temperatures more effectively.

Promotes Deep Root Growth

Watering your plants in the evening allows the water to penetrate deeper into the soil, encouraging deep root growth. This is particularly advantageous for plants that have deep root systems or require a more extensive reach for water uptake. By watering in the evening, you are providing your plants with ample water for their roots to absorb and develop a robust root system. Deep roots contribute to overall plant health, stability, and resilience.

Reduced Water Loss Through Evaporation

Similar to morning watering, evening watering also minimizes water loss through evaporation. As the day cools down, the rate of evaporation decreases. By watering in the evening, you are ensuring that the water you provide stays in the soil longer, giving your plants more time to absorb it. This can be particularly beneficial in areas where water is scarce or during drought conditions when water conservation is essential.

Plants that Prefer Morning Watering

While both morning and evening watering have their merits, some plants specifically benefit from being watered in the morning. The following plant species generally prefer morning watering:

Cacti and Succulents

Cacti and succulents are well-suited to arid environments and have adapted to survive with minimal water. These plants prefer morning watering as it allows them to absorb water early in the day and store it efficiently. By providing water in the morning, you are mimicking their natural environment and promoting their optimal growth and health.

Plants with Fuzzy Leaves

Plants with fuzzy leaves, such as African violets or African daisies, benefit from morning watering. These plants have a higher risk of developing fungal diseases if their leaves remain damp for extended periods. Watering in the morning allows the foliage to dry off throughout the day, reducing the risk of fungal growth and promoting healthier plants.

Tropical and Rainforest Plants

Tropical and rainforest plants often thrive in humid environments. Watering them in the morning helps create a humid atmosphere within your greenhouse that mirrors their natural habitats. These plants typically have higher watering requirements, and providing water in the morning ensures that they have sufficient moisture throughout the day.

Plants that Prefer Evening Watering

While morning watering may be optimal for some plants, others show a preference for being watered in the evening. The following plant species generally benefit from evening watering:

Tomatoes and Peppers

Tomato and pepper plants often produce fruit during the warm summer months. Watering them in the evening helps cool their leaves and fruits, preventing heat stress and promoting healthier growth. Evening watering also supports the development of juicy and succulent fruits, which can be highly desirable for these vegetable garden staples.

Lettuce and Leafy Greens

Lettuce and other leafy greens are commonly grown as part of a greenhouse salad garden. Watering them in the evening helps keep their leaves hydrated and fresh, preventing wilting and maintaining the crispness of the greens. By providing water in the evening, you can ensure a bountiful harvest of high-quality lettuce and leafy greens.

Flowering Annuals and Perennials

Many flowering annuals and perennials bloom during the day and benefit from evening watering. By watering these plants in the evening, you are providing them with the hydration they need to produce vibrant and long-lasting flowers. Evening watering also helps prolong the blooming period of these plants, allowing you to enjoy their beauty for an extended time.

General Guidelines for Greenhouse Watering

While the specific watering requirements can vary depending on the plant species, there are some general guidelines to follow when watering your greenhouse plants:

Monitor Soil Moisture Levels

Regularly monitor the moisture levels in your greenhouse soil to ensure you are providing adequate water to your plants. Use a moisture meter or your finger to check the soil’s moisture content before watering. This will help you avoid overwatering or underwatering your plants and maintain optimal growing conditions.

Consider Plant Watering Needs

Different plants have different watering needs. Take into account their specific requirements for moisture, humidity, and frequency of watering. Research or consult plant care guides to understand the watering needs of the plant species you are growing in your greenhouse. By catering to their specific watering needs, you can provide them with the best conditions for growth and productivity.

Avoid Watering During Midday Heat

Try to avoid watering your plants during the midday heat, especially when temperatures are high. Watering during this period can lead to water loss through evaporation and increase the risk of heat stress on your plants. Instead, opt for morning or evening watering when temperatures are cooler and the risk of water evaporation is lower.

Use Proper Irrigation Techniques

Utilize proper irrigation techniques to ensure that your plants receive water efficiently. Avoid overhead watering, which can lead to water waste and increase the risk of disease development. Instead, consider drip irrigation or using a watering can to deliver water directly to the plant’s base. This ensures that the water goes directly to the roots, where it is needed most.


Deciding whether to water your greenhouse in the morning or the evening ultimately depends on multiple factors. Consider the specific needs of your plant species, along with the natural light availability, temperature and humidity levels, and evaporation efficiency. While morning watering provides benefits such as full-day photosynthesis and disease prevention, evening watering offers protection against hot temperatures and promotes deep root growth.

Remember to adjust your watering practices based on seasonal changes and the unique requirements of your greenhouse plants. By finding the right balance between watering time and frequency, you can ensure optimal growing conditions, healthy plants, and a thriving greenhouse environment.

You May Also Like

About the Author: Jake Scott