How to Fertilize Geraniums


Geraniums are popular flowers that can thrive in pots or a garden. Geraniums are perennials, which means they can flower for more than one season, but some types of geraniums are more fragile and cannot survive cold winters. All types of geraniums need consistent amounts of fertilizer, especially those that are grown in baskets and pots.



Things You’ll Need
  • 20-20-20 fertilizer
    1. Mix one half ounce of 20-20-20 fertilizer, which is water soluble, with one gallon of water. Feed your geraniums fertilizer every one to two weeks. The numbers of the fertilizer, such as 20-20-20, tell you the percentages of nitrogen, phosphorus and potassium that make up the fertilizer. Geraniums need plenty of nitrogen in the soil or else they may turn yellow.
    2. Test the pH level of your soil if you planted your geraniums in the ground or in pots. Geraniums grow best in soil with a pH level of 6.5 and will not produce healthy-looking flowers in a pH below 5.5.
    3. Add one half teaspoon of dolomitic limestone to your fertilizer to raise the pH level of the soil if the pH level is not in the desired range.

When to Fertilize a Clematis


When you run out of horizontal space in your garden, there is always room for clematis. The plant is a vine that is known to gardeners as the queen of the climbers. Clematis will grow well up trellises with very little training and produces large blossoms in a showy display.


  • There are three basic types of clematis. These types are sorted based on when and how the plants bloom. The first group of clematis are known as early flowering plants. Early flowering clematis bloom in April or May from buds produced the previous year. The second group are known as large flowering clematis. Large flowering clematis bloom on short stems from the previous year’s growth. A second flush of blossoms may occur in late summer on new growth. The final group is called late-flowering clematis. Late-flowering clematis bloom from mid-June until fall on the current season’s growth. Clematis should not be fertilized while it is flowering.

Soil Test

  • Before planting clematis, have the soil tested. A soil test will indicate the nutrient level of soil as well as the pH. Clematis prefer well-drained, fertile soil and a pH around 7.0. Based on the results of a soil test, amend soil to improve the nutrient structure and pH prior to planting. The soil should be loosened to a depth of 12 inches and soil amendments should be dug into the soil at least two months before planting to give the amendments a chance to change the soil structure.


  • Clematis prefer to grow with their vines in full sun. Despite this, they like their roots to be in a shady, cool environment. Growers typically underplant clematis with low-growing shrubs or ground cover. They may also be mulched with organic mulch or a top dressing of compost. Mulch will keep the soil above the roots cool and will improve the fertilization of the soil.


  • Clematis do not need to be fertilized once they are established. But for the first year after they are planted while the roots of the vine are becoming established, they will develop quickly if given a general fertilizer such as as 15-5-5. The fertilizer may be applied at a rate of 1/2 pound per 50 square feet around the plant. Plants should be well-watered, but not overfed.

When to Fertilize Azaleas & Rhodies


Azaleas and rhododendrons are not heavy feeders, but they benefit from a yearly application of fertilizer. A formula for acid-loving plants, cottonseed meal or a general 6-10-4 formula applied on the soil surface is recommended. Fertilizers supplying nitrogen in the ammonium form are preferred.

Fertilizing When Planting

  • Azaleas and rhododendrons do not normally need fertilizer at planting time. If your soil test indicates a need for phosphorus, you may mix a superphosphate or triple-phosphate fertilizer into the soil before planting.

    Fertilize While Dormant

  • You may fertilize in late fall after a hard freeze or early in the spring while plants are still dormant. A light side-dressing may be applied near each plant, with caution to avoid damaging tender roots near the surface of the soil.

    Fertilize in Spring

  • You may also fertilize in spring after new growth appears. Do not fertilize after July 1. Fertilizing too late in the summer will stimulate fall growth, which will be too tender for winter cold.


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    Company Profile

    Over 30 years experience on NPK fertilizer and Detergent producing

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