How do I fertilize Clethra Ruby Spice?
Clethra are one of the easiest to grow and one of the most underused ornamentals available today. In order for clethras to give their maximum performance, certain fertilization requirements must be met. Despite their fast growth patterns, clethra are considered to be light feeders. Although many well established clethras perform wonderfully in the wild without being fertilized, they will do even better with a regular fertilization program. Apply an early spring fertilizer with a product such as Espoma Tree-tone or Plant-tone at the recommended rate this will give the plant a boost of nitrogen that will be needed for healthy abundant foliage. Follow this up with a early summer application of Espoma Holly-Tone, this will provide the necessary nutrients and raise the acid level in the soil which Clethra favor. Espoma products are easy to use, just sprinkle around the base of the plant and water it in. Be careful with products such as miracle-grow as these products can burn newly planted plants when not used at the recommended rates. Slow-release fertilizer can help prevent rapid sucker growth that is vulnerable to diseases and insects. In choosing the basic type of fertilizer for your clethra needs, it is important to determine what you need your clethra to do. If your plants are well established, and you are not concerned about more growth, choose a fertilizer that has a smaller first number, and a larger second and third number. For example, a 4-8-8 fertilizer with minor elements included would be a good choice for a well established clethra. If your clethra are younger plants, and you want them to concentrate their energies on growing for a few years, you may wish to choose a fertilizer that has a higher first number such as 12-4-8 or 10-10-10. Be sure that these fertilizers have minor elements as well. No matter what fertilizer you choose, “Always Read the Label”. Do not apply more fertilizer than is recommended on the label. Organic fertilizers such as Dehydrated Cow Manure or Milorganite may provide an excellent source of slow release nutrients in addition to your primary fertilizer. In the southeastern United States, three fertilizer applications per year are usually adequate to supply your clethras’ nutritional needs. Generally, an application sometime during the first part of March, followed by a second application during the first part of May, and a final third application during the first part of July should be sufficient for you summersweets fertilization needs. Always consult your Extension Service and your local nursery experts as to specific recommendations of fertilizers for your area. If you do not have acid soil, soil tests may be necessary followed by ph adjustments. Clethra such as Clethra Ruby Spice generally do well in acidic soils with ph readings from 5.5 to 6.8. If the ph of your soil is not correct, it may affect the ability of your clethra to absorb the fertilizer that is applied. It would not be a bad idea to have a soil sample checked with your local Extension Service before applying fertilizer. When you have selected your fertilizer and are ready to apply it, be sure to rake your mulch back to the drip line of each plant. Apply the fertilizer according to the label directions immediately on top of the soil, and be sure to water the plant thoroughly after the application. You can then rake the mulch back around the base of the Clethra Ruby Spice. Although it is tempting to spend less time by not raking the mulch back during fertilization, the results will be less than desirable, if the fertilizer is applied on top of the mulch. Proper fertilization of your plants, like Clethra Ruby Spice will lead to healthier and more disease resistant plants, as well as provide you with many more enjoyable blooms. Always, read the label on your fertilizer bag, and follow the instructions.
How do I prune Clethra Ruby Spice?
In general gardening terms, pruning is probably the most misunderstood gardening chore, and certainly, the chore that is most likely neglected. When we specifically look at pruning with regards to clethra, this misunderstanding and negligence can be magnified. Pruning has been described as a “combination of art and science.” Pruning a specific plant to look a specific way, involves art in creating a unique definition for a specific plant, and it involves science in understanding the physical growing habits of the plant to be pruned. The most important reason for pruning Clethra Ruby Spice is to improve the overall health of the plant. Many times, clethras that have not been pruned in a few years will develop dead or degenerative twigs. Removing the dead and dying limbs will minimize the possibility of diseases such as “dieback” and will also allow the plant to re-concentrate its energies. In many instances, clethras that have been neglected for a number of years will become infested with insects such as scale. Severely pruning such infested clethras will not only re-invigorate the plant, but will also reduce insect problems and minimize corrective treatments necessary to eliminate such problems. Another reason for pruning summersweet shrub is to re-define the plant’s definition within the landscape. Many times, a plant may outgrow its intended size in the landscape, and must be pruned to re-define its purpose. Pruning should always be associated with re-invigorating a plant by allowing it to focus its energies on producing more vigorous branches, foliage, and flowers. Specific plant objectives require specific pruning techniques. If a clethra is being trained as an hedge, it would need to be pruned differently than if it were being grown as a specimen form. Screenings and hedges of clethra would need to be pruned for their specific purpose within the landscape. It is also important to understand the specific growing characteristic of a certain plants when pruning that particular plant. When pruning established clethras where no labeling is present on a variety to identify it, you need to look at the general growth patterns of the plant to be pruned. These observations should give you a good idea of how the plant tends to grow, and also how you should prune the plant. Many times, gardeners inherit a wealth of shrubs in their gardens when they purchase a previously owned residence. Although these plants may have been lovingly cared for by the previous owner, it may be necessary to severely prune these plants to restore vigor or to create a different definition in the landscape for the new owner of the property. Severe pruning should be done just after the plant has finished blooming. In some instances where the required pruning would be drastic, the pruning may be done towards the end of summer even if the plant has not finished blooming. Severe pruning of clethras is generally thought to involve the removal of one third to one half of the existing plant. However, in some instances, this severe pruning could be even more drastic. In most cases, the plant should have no problem recovering from such a major pruning, and the pruned plant should quickly begin to grow with vigor. If severe, pruning is necessary, it must be realized that the plant will shift its focus in the short-run from setting flower buds to growing vigorously, and it is very likely that the Clethra Ruby Spice will have few if any bloom buds during the season following the major pruning. During the second season following the severe pruning, the clethra should resume normal bud setting, and the plant should have healthier blooms because of the increased vigor in the plant. It is important to always use sharp tools when pruning plants. Knives, hand cutters, saws, and shears should be sharpened if necessary before pruning any plants. A sharp cut will heal quicker than a jagged cut, which will also minimize the likelihood of disease investing a cut during pruning. It is generally recommended to not use power equipment such as gas hedgers to prune clethra. Prune limbs flush to the feeder branches without leaving nubs. These leftover branches could eventually provide host for disease to enter your plants. Many gardeners apply a pruning sealant or paint to all cut surfaces after pruning, but that practice is generally not necessary. Pruning large clethras may be minor or major. Its general purpose is to maintain or restore vigor to the plant. Large clethras that have been severely pruned have the advantage of a large root system that has excessive capacity, and its roots are capable of supplying all of its energies to a smaller number of branches and foliage. This enables the plant to increase its vigor, and become healthier. Pruning large clethras that are well established will enable the plant to have continued vigor, and lead to many more years of supplying beauty to the landscape.
