What are the best herb fertilizers? The answer is that most of them require the gardener to use more water than they think is necessary. For example, the best herb for you is one that doesn’t turn yellow over time, and then requires little if any watering at all.
If you’re having trouble finding the right fertilizer for your plants, look on-line for a review of the most popular liquid fertilizers. If you find that some of them make your rosemary plant turn yellow over time, you can apply a controlled control measure by lightly washing the leaves with water, blotting the leaves with paper towels, or rinsing with plain water. This will help prevent the roots of the plant from turning yellow. If you do have yellowed leaves, follow the procedures above until they return to normal, then do the following steps.
There are a couple of reasons for this. First, certain nutrients are more water-soluble than others, and rosemary plants are one of those. Second, some herbs, such as the mints you may be growing in your kitchen, need a different method for handling water than the others. Mint is an excellent moisture regulator when it is dry, but in the presence of moisture, it will often form a gel and stay in place unless removed from the plant. (If you keep your rosemary plants in pots, be sure to remove the gel occasionally so they don’t dry out.)
To clean your rosemary plants, simply wash them. Add about a half a cup of liquid dish soap per four-inch pot, depending on the size of your pot. Be sure to rinse well after washing. Fill your four-inch pot with water and bring to a boil. Remove your rosemary plants from their pots, and if they appear dry and lifeless, add a few drops of water or dish soap to their liquid dish soap. You can also use a couple of tablespoons of essential fertilizer.
Once your rosemary plant has roots down, you can’t simply turn them over every couple of weeks to expose the soil to new, fresh soil. If you want to maintain that healthy, attractive height, you must mulch your rosemary plant. Mulching a rosemary plant is like turning the plant upside down, and is best done in the late winter or early spring. Make sure to do it with a good quality mulch that is designed for winter usage. A fine grade garden variety of straw, pine needles, wood chippings, or grass clippings will work well.
What if your rosemary leaves are turning yellow instead of turning yellow when you prune them? Don’t despair. This does not mean your plants have been damaged. Instead, this is a sure sign of mildew. The leaves of a new, healthy plant will be bright green, and the growing tips will be thick and dark green.
Mildew begins in the soil around the base of the plant, and works its way up through the root system, first infecting the roots and then the entire plant. There are many different kinds of fungi that cause this process, including Penicillium. There are several kinds of fungicides on the market designed to control excessive growth of these fungus-like organisms. You should check the label on the product to find the proper ingredients, and apply a variety that is specially formulated to control growth of fungi. You can also make your own mixture of fungicide and soil additives, and apply it to your rosemary bushes regularly.
To control excessive growth of fungi and prevent turning yellow leaves, you should aerate your potted rosemary plants on a regular basis, as well as give them a regular watering. Watering the plants encourages the release of essential nutrients, such as nitrogen and phosphorus. These compounds are needed by the roots to grow, and turn yellow leaves. On the other hand, if the water dries out the roots, the leaves will turn yellow quickly.