- 1). Schedule the fertilizing of your shrubs in early spring, just before the seasonal growth spurt. Coming out of winter dormancy, plants are likely to be weak as a response to a reduced availability of nutrients. Adding fertilizer will boost the plants' natural metabolic activity, encouraging the development of new plant tissues.
- 2). Purchase a slow-release fertilizer containing at least 10 percent nitrogen. Slow-release formulas do not dissolve in water and will break down gradually, feeding the plants over an extended period of time, and formulas containing nitrogen promote the growth of new foliage. Choose a bag or box labeled 16-4-8 or 12-4-8. These numbers represent the quantities of nitrogen, phosphorous and potassium in the fertilizer formula. Alternatively, natural fertilizers such as fish emulsion, animal manure or sewage sludge can also be used.
- 3). Water the shrubs before putting down fertilizer, ensuring the soil around the plants is thoroughly saturated. The moisture in the soil will help prevent accidental chemical burns of sensitive root hairs.
- 4). Apply 1 tbsp. of granular fertilizer for every foot of shrub height. Scatter the fertilizer evenly around the base of the shrub or, if using a natural fertilizer, spread the chosen materials in a 1-inch layer around the base of each plant. Apply the fertilizer in a circular pattern that encompasses the plant's root zone. The roots of any given plant generally spread three times as far as their branches. Do not allow the fertilizer to come within 6 inches of the shrubbery stalks as direct contact can chemically burn the bark.
- 5). Water the plants lightly once the fertilizer has been spread, moistening the entire treatment area. This will help to transport the nutrients to the roots of the shrub.
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