Perennials & Ornamental Grasses

Fertilize perennials - which fertilizer for what?

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Perennials should be fertilized regularly. Here we explain which fertilizer is best for which plant and when it should be fertilized.

Healthy and long flowering perennials, need good fertilizer (Image: © AnnaReinert - Fotolia.com) Perennials with healthy plant growth and abundant blooms, that is what every amateur gardener wants. In addition to water and carbon dioxide, the plants need sufficient nutrients that they absorb via their roots. In plants of several years, these nutrients are lacking after a few years if they are not fertilized regularly. The result: disease-prone, growth-inhibited and blooming plants.

It is therefore important to provide perennials with fertilizer at least once a year. Before you buy any fertilizer bag, you should know which nutrient components are contained in the fertilizer and how they affect the plants.

content

  • 1 main nutrients for plants
  • 2 Which fertilizer for bedding and magnificent perennials?
    • 2.1 Organic fertilizer works for a long time
  • 3 Mineral fertilize with additional potassium requirements
  • 4 When should perennials be fertilized

1Main nutrients for plants

Different nutrients affect the healthy growth of the perennials and the flower base. The table below shows the effect these have on the plants.

ingredientsEffect on the plant
Potash (K)promotes sugar and starch formation
Plants become stable and resistant
Magnesium (Mg)promotes leaf green and lush green needles
Phosphorus (P)promotes flowering and fruiting
especially for flowering perennials
Nitrogen (N)promotes plant growth
Lime (Ca)promotes sugar and starch formation
Plants become stable and resistant

The trace elements, such as boron, zinc, copper, manganese and iron, are just as important as the main nutrients. However, small amounts are sufficient. Some of them are already contained in the soil and in fine dust.

Perennials are rather frugal and have a low need for nutrients. Natural perennials in particular develop splendidly if they are fertilized with compost alone every spring. In contrast, bedding and magnificent perennials are somewhat more demanding. They grow abundantly in the summer and absorb vital nutrients from the soil.

2What fertilizer for bedding and magnificent perennials?

Organic fertilizer works for a long time

"Less is more", this principle also applies when fertilizing perennials. This applies especially to fertilizers whose nutrient components take effect immediately. There is a growth spurt, but also side effects for the plant. So rootstocks and the perennial can be damaged. The organisms living in the soil are also impaired, and excess nutrients can be washed into the groundwater.

If you want to fertilize gently and in an environmentally friendly way, it is advisable to use organic fertilizer. This releases nutrients over a longer period of time and the perennial is optimally nourished over the growing season. Organic fertilizers are available in a wide range from gardening stores. These include:

  • Horn chips
  • hornmeal
  • blood meal
  • Beef manure pelleted
  • Horse manure pelleted
  • Manure pelleted
  • Organic flower fertilizer
  • Organic garden fertilizer

These organic fertilizers contain all the important nutrients that a perennial needs for healthy plant growth and which stimulates their flowering. However, tall perennials have a higher potash requirement. This nutrient supports the stable and robust plant structure. Various mineral products are suitable for potassium-emphasized fertilization.

3Mineral fertilization with additional potassium requirements

Perennials in particular become stable and stable by enriching them with sufficient strength. Potassium promotes the formation of sugar and starch and makes the plant resistant to drought and pests. The table below shows which potassium fertilizer is suitable for your perennials.

potash fertilizerNähstoffkomponentenEffect on…

Patentkali
  • Potassium (K)
  • Magnesium (Mg)
  • ... a balanced water balance and the formation of sugar and glycols
  • ... the frost resistance as well as the resistance of the plant to drought and temperature fluctuations
  • ... root and tuber growth
  • ... healthy foliage

Thomaskali
  • Phosphorus,
  • Potassium,
  • magnesium
  • ... a balanced water balance and the formation of sugar
  • ... the frost resistance as well as the resistance of the plant to drought and temperature fluctuations
  • ... root and tuber growth
  • ... healthy foliage
  • … Optimal soil fertility

potassium sulphate
  • potassium
  • sulfur
  • ... a balanced water balance and the formation of sugar and glycols
  • ... the frost resistance as well as the resistance of the plant to drought and temperature fluctuations
  • ... root and tuber growth
  • ... strong color formation of the flowers

4When should perennials be fertilized

Flowering and magnificent perennials have absorbed a certain amount of nutrients from the soil in the course of the past garden season. Therefore, the nutrient depot for the coming garden year must be balanced again to prevent harmful deficiency symptoms in the plants. If the vegetation on the herbaceous beds starts in spring, then it is time to fertilize.
March to May:

  • compost
  • Organic fertilizer
  • Organically made up flower or garden fertilizer

➢ Promotes plant growth and contributes to the healthy development of the perennials.

March to October:

  • Patentkali

➢ Promotes starch formation and thus robust plant cultivation for tall perennials. In addition, the water balance of the perennials is optimally circulated.

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September to October:

  • potassium sulphate

➢ Promotes starch formation and thus robust plant cultivation of tall perennials. In addition, the soil is improved.

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