How to water Cannabis plants by hand?

Watering cannabis plants—whether for medical cultivation without a controlled environment or for hemp varieties—is a crucial aspect that directly impacts the quality and yield of your harvest. Many legal growers, especially beginners, often wonder how much water or nutrient solution their plants need.

However, several factors come into play, making it difficult to come up with a one-size-fits-all answer. Here, the experts at Silent Seeds share various tips for effective manual watering to help you take the best possible care of your feminized cannabis seeds of the highest quality and harness the full potential of the collected genetic material.

Key Success Factors

The climate in your geographic area plays an important role in determining water requirements, whether you’re growing indoors or outdoors. It’s essential to monitor temperature and humidity levels during the day and night. These values serve as indicators of your plants’ needs and should be closely monitored.

In hot environments, you can improve water retention and reduce evaporation by mulching the surface of the growing medium and adding perlite. This helps prevent water shortages and the resulting stress. On the other hand, as harvest time approaches—especially in the fall—you should space out watering intervals to prevent fungal problems.

The pot size and the capacity of the growing medium are important factors to consider. The larger the pot, the more water or nutrient solution is needed. During the early growth stages of small plants in large pots, water requirements are generally low. As the plants grow, their needs increase.

Proper watering during the initial phase is a challenge for novice growers. Overwatering can lead to a lack of oxygen in the growing medium, which suffocates the roots and hinders the plant’s development. Prolonged waterlogging can cause root rot and fungal problems. Once the plants reach a height of 70 cm to 1 m, watering becomes easier to regulate.

The frequency of watering depends on the type of growing medium used. Coconut coir dries out more quickly than soil because it is lighter and more porous. It is essential to provide the right amount of water based on the climate, the size of the plant, and the water-holding capacity of the growing medium.

The size of your cannabis plants also affects their water requirements. Smaller plants need less water, while larger plants need more. Avoid overwatering the growing medium during the first three weeks of growth to ensure proper growth and yield. Weakening the plant’s immune system can lead to root rot and infection by pathogens.

Genetic or phenotypic variations among plants can affect root mass growth. The expression of traits can vary, resulting in different plant structures. It is important to adjust water and nutrient supply to the size and natural needs of each plant.

A Few Tips

To ensure proper watering, follow these practical tips:

• Water your plants outdoors in the morning or indoors before turning on the lights to prevent root and leaf burn.
• Compare the weight of dry and watered pots to determine the plant's water requirements at different stages of growth
• Use water at a temperature similar to that of the growing area to prevent thermal shock and stress
• Don't wait for the leaves to fall; the manual weighing method is a reliable indicator of when to water
• Mix the fertilizers thoroughly and measure the pH and EC levels before application
• Calibrate digital pH meters and EC meters regularly, and clean them after each use
• Avoid storing nutrient solutions for more than 24 hours and maintain stable environmental conditions for fertilizers
• Consider the four main categories of factors discussed in this article: climate, pot size, plant size, and genetic variations
• By following these basic principles of proper watering, you can promote healthy plant growth and successfully grow cannabis.