One of the most common questions homeowners ask is, "How often should I fertilize my trees and plants?"
The answer depends on the type of plant, its age, and your local growing conditions. In arid and semi-arid climates, where rainfall is more limited and nutrients are not naturally replenished as often, regular fertilization can play an important role in maintaining healthy growth.
For many landscape trees and shrubs, fertilizing twice a year is often sufficient. A spring application supports new growth, while a fall application can help plants replenish nutrients after the growing season. Local nurseries and extension services can often provide fertilization schedules tailored to your area.
Citrus trees are an a special case. Because they are evergreen and fruit-producing, they are are commonly fertilized three times per year: late winter (mid-February), late spring (May), and late summer (August/September). A good way to remember when to fertilize is to go by the following holidays: Valentine's Day (February), Memorial Day (May) and Labor Day (September).
Just as important as timing, fertilizer needs water to become available to plants. In arid and semi-arid climates, nutrients from the fertilizer may not make it into the soil and root zone without adequate and effective irrigation. For best results, fertilizer should be watered in thoroughly and delivered where active roots can access it.
As trees and shrubs mature, those active roots are often located near and beyond the drip line—the outer edge of the plant's canopy. Delivering both water and nutrients near the drip line places them where they can do the most good.
Applying fertilizer in the right amount, at the right time, and in the right place will ensure your trees and plants receive the nutrients they need to thrive!