Foliar feeding is a supplemental method of feeding plants by applying nutrients directly to the leaves. This technique can be effective in addressing nutrient deficiencies and enhancing the overall nutrition of plants. It is considered supplemental because the roots should remain the main source of nutrition. But in times of fast growth, stress, or deficiency, applying nutrient solutions directly to the leaves helps plants immediately absorb a portion of the nutrients, providing a fast-acting solution for nutrient deficiencies or boosting growth in heavy feeders. Foliar feeding can seamlessly integrate into your garden routine to deliver outstanding results for both healthy plants and stressed out or nutrient-deficient ones.
Understand the benefits of foliar feeding.
Organic amendments that can be used as foliar feeds often contain beneficial microorganisms and enzymes that promote biological processes within the plant, ultimately contributing to improved nutrient uptake, enhanced growth, and a more resilient plant. Since foliar feeding is quite targeted in its application, it reduces the risk of introducing or exacerbating nutrient imbalances in the soil, thereby ensuring a more sustainable approach to plant nutrition management. Finally, foliar feeding allows for the opportunity to customize your plant care regimen based on the unique needs of your garden. By regularly monitoring the health of your plants and observing any signs of nutrient deficiency or stress, you can tailor your foliar feeding schedule and nutrient combinations to address these specific concerns. I have used foliar feeding most frequently in times of plant stress, specifically for sudden temperature changes, transplant shock, and disease pressure.
Choose a non-synthetic fertilizer to use
Organic fertilizers are derived from natural sources, such as fish, manure, or seaweed, which are not only more sustainable but also help reduce the harmful environmental impacts associated with synthetic fertilizers. These nutrients are also less likely to “burn” our garden plants when used as a foliar feed. Research and understand the specific needs of the plants in your garden when choosing an amendment. It is also important to mix and apply the spray appropriately, following manufacturer instructions and best practices to avoid any harm to your plants.
Determine which plants to foliar feed.
Familiarizing yourself with the plants in your garden and their specific needs is always important, but even more so for successful foliar feeding. Seedlings and young plants may benefit from more frequent foliar feeding to support their rapid growth and development, whereas established plants may best benefit during times of stress. Additionally, certain crops, such as tomatoes, are more prone to specific micronutrient deficiencies like calcium and can benefit from targeted feeding. Different plants have varying requirements when it comes to nutrients, and choosing the right balance can significantly impact their health and growth. Many different types of foliar sprays are available that cater to the unique requirements of various plants and growth stages, such as kelp extracts, fish emulsions, and more. I frequently use Elm Dirt’s Plant Juice or Bloom Juice as a foliar spray based on which stage of growth my plants are in.
Apply a fine mist or light spray to leaves
While foliar feeding can be a game-changer in terms of plant health and productivity, it is essential to carefully manage the frequency and concentration of this method to avoid any potential negative consequences. Over-application of concentrated foliar sprays, specifically synthetic-based ones, can lead to the burning of plant leaves or the rapid growth of foliage with diminished nutritional value. Once every two to three weeks, or perhaps more frequently but in weaker concentrations if plants are experiencing significant stress, is generally sufficient unless plants are showing significant signs of stress or deficiency. By observing and tracking the changes in plant health following applications, gardeners can fine-tune the application rates and concentrations to suit the unique requirements of each plant species.
When and how to apply
The most effective time for foliar feeding is during the early morning or late afternoon when temperatures are cooler and humidity is higher, as this ensures the stomata and micropores on the leaves are open, promoting optimal nutrient uptake. The majority of these openings are located on the undersides of plant leaves so targeted application there will be most beneficial.
In addition to timing and nutrient concentrations, the spray solution's even distribution is another important factor to consider. Utilizing a high-quality sprayer that produces fine particles will ensure that the nutrient solution covers the entire surface of the leaves evenly, maximizing nutrient absorption. I use a lawn sprayer that attaches to my hose (this is the one I use because I can choose liquid or granules and control the ratio). For smaller areas a spray bottle set to a fine mist can achieve the same results. Gently shaking or moving the plants during the application process can help distribute the solution more effectively, ensuring that all areas of the foliage are reached. To further enhance the process and boost nutrient uptake, some gardeners may choose to add a natural surfactant or wetting agent, like yucca extract or a pure castile soap, to improve the nutrient solution's ability to adhere to the leaf's surface.
Monitor results and adjust as necessary
As you begin to incorporate foliar feeding into your gardening routine, watch closely for how your plants react. Conducting a soil test in your garden can help determine which nutrients are lacking and need further supplementation.
Offering targeted foliar feeding treatments, customized to the individual plants' needs, ensures that your garden receives a well-rounded and effective supplement plan to support overall plant health. Foliar feeding is a powerful tool for providing supplemental nutrients directly to the plant leaves, promoting quicker nutrient uptake, effectively addressing deficiencies and supporting the growth and recovery of stressed or heavy-feeding plants.
Your Friend in the Garden,
