The Content Of The Article:
- When is fertilized?
- How is fertilizer fertilized?
- The most important nutrients
- The best oleander fertilizers
- Worth knowing about Oleanderdünger shortly
The oleander, also commonly called rose laurel, thrives particularly well under Mediterranean conditions. It not only requires the right location, but must be regularly fertilized during its flowering and growth phase for an intense flowering and rich green leaves. However, fertilization of the oleander will begin only after clearing out of its winter quarters. In winter you should fertilize under no circumstances, because the plant is not active during this time and therefore does not need nutrients.
When is fertilized?The oleander is best fertilized from the beginning of March to the end of September. He is currently in its flowering and growth phase and therefore needs a lot of nutrients. The first application of fertilizer should be made, however, only if the oleander shows stronger and dark green leaves. Because then he is really active. His active time begins shortly after clearing. Now he needs fortifying nutrients for a good start to his growing season.
Tip: At the end of September / beginning of October, start fertilizing so that the oleander can prepare for his winter rest period. His shoots must be able to log accordingly well.
How is fertilizer fertilized?The oleander or rose laurel is fertilized once or twice a week with liquid container or oleander fertilizer. If you do not have the time to work on a weekly basis or think you can forget it more often then it's worth it for you to take a long-term fertilizer. Depending on the manufacturer, this lasts for 6 to 12 months and provides your oleander with the necessary nutrients.
The most important nutrientsIn plant nutrition, minerals always play a very important role. So also with the fertilization of the oleander. The nutrients can be divided into macro and micro minerals (trace elements).
The macro minerals include the nutrients that the oleander needs most as a starvation. These can be subdivided into primary and secondary nutrients.
Primary nutrients: The primary nutrients, also known as the plant's basic nutrients, are mainly nitrogen (N), phosphorus (P) and potassium (K). These substances must be fed to the oleander regularly. The fertilizers that contain these basic nutrients are referred to as NPK fertilizers.
Secondary nutrients: Secondary nutrients include sulfur (S), magnesium (Mg) and calcium (Ca). These nutrients are actually sufficient in good garden or tub plant soil, so that an addition of these substances is not always necessary. However, these nutrients are consumed quickly, especially in oleander plants in Kübelhaltung, so these substances must be added just as regularly.
Microminerals (trace elements) are of utmost importance for the growth of the oleander. These include manganese (Mn), chloride (Cl), copper (Cu), iron (Fe), boron (Bo), zinc (Zn) and molybdenum (Mo). Of them, however, only very small quantities are needed. Below is the meaning of each nutrient:
Nitrogen (N): Nitrogen is especially important for all plant parts of the oleander growing above the earth. The absorbed nitrogen is incorporated into amino acids, which are the building blocks of chlorophyll, nucleic acids, proteins and vitamins. The nitrogen is not absorbed as a pure element, but mainly as nitrate (NO3-) or in small quantities as ammonium (NH4 +) above the soil. An oversupply of phosphate can affect nitrate uptake. If too much calcium, potassium and magnesium are present, the ammonium uptake is impaired.
Phosphorus (P): Phosphorus is an important element in the process of photosynthesis and makes the oleander more resistant to stress. In addition, phosphorus helps root and flower growth.
Potassium (K): Potassium promotes resistance to disease, supports photosynthesis, and helps in the formation of important proteins.
Magnesium (Mg): This nutrient is part of chlorophyll and important for photosynthesis. In addition, the element helps in the activation of important enzymes.
Boron (Bo): The element boron affects the production of carbohydrates and sugars and is very important for seed production and maturation.
Calcium (Ca): Calcium is considered an important part of cell walls and ensures the transport of other nutrients.
Sulfur (S): Sulfur is very important for protein production and supports the production of vitamins and enzymes. In addition, sulfur helps in chlorophyll production and root growth.
Copper (Cu): Copper is a very important trace element for the reproductive growth of the oleander. The nutrient supports protein utilization and stores in the root system.
Molybdenum (Mo): This trace element helps in the uptake and utilization of nitrogen.
Chloride (Cl): Chloride is an important component in the metabolism of all plants.
Iron (Fe): Iron is an important factor in the production of chlorophyll.
Zinc (Zn): Zinc supports the conversion of carbohydrates and regulates the growth and absorption of sugar.
Manganese (Mn): The element manganese is an activator for important enzymes and promotes protein synthesis.
The best oleander fertilizersMany hobby gardeners say fertilizer with compost and a breeze of guano will be enough to add extra nitrogen to the oleander as soon as it's replanted into fresh potting soil in spring. Some also use blue grain. However, the trade will provide you with some special oleander fertilizers and other suitable fertilizers that you can use to make your oleander thrive and bring forth many flowers. Here I have put together the best commercially available oleander fertilizers.
Compo Basacote Plus 12M (slow release fertilizer, coated round grain)
This NPK fertilizer with trace nutrients is a covered depot fertilizer. Its duration lasts up to 12 months. You can also combine this fertilizer with Triabon fertilizer from Compo. According to the manufacturer, the correct dosage of Compo Basacote Plus 12M for the oleander is 5 g per liter pot volume. The fertilizer works best from a temperature of 10° C and upwards. Composition:
- 15% - total nitrogen (7.0% NO3-N nitrate nitrogen + 8.0% NH4-N ammonium nitrogen)
- 12% K2O - water-soluble potassium oxide
- 8% P2O5 - water soluble and neutral ammonium citrate soluble phosphate
- 5% S - total sulfur
- 2% MgO - total magnesium oxide
- 0.4% Fe - iron
- 0.06% Mn manganese
- 0.05% Cu - copper
- 0.02% B - boron
- 0.02% Zn - zinc
- 0.015% Mo - molybdenum
Triabon Compo (Granules)
This granulate has a duration of action of 3 to 4 months. Its effectiveness persists even at low temperatures. Composition:
- 16% N - total nitrogen (11% crotonylidenediurea + 5% ammonium nitrogen)
- 12% K2O - water-soluble potassium oxide
- 9% S - total sulfur
- 8% P2O5 neutral ammonium citrate soluble and water soluble phosphate
- 4% MgO - total magnesium oxide
- 0.10% Fe - iron
- 0.10% Mn - manganese
- 0.04% Cu - copper
- 0.02% B - boron
- 0.015% Mo - molybdenum
- 0.007% Zn - zinc
This liquid fertilizer is a low-chloride fertilizer and contains an extra portion of potassium and iron to prevent yellowing of the leaves (chlorosis). Composition:
- 7% N - total nitrogen (3.4% nitrate nitrogen + 3.6% ammonium nitrogen)
- 6% P2O5 - water-soluble phosphate
- 5% K2O - water-soluble potassium oxide
- 1% S - water-soluble sulfur
- 0.01% B - water-soluble boron
- 0.05% Fe water-soluble iron as chelate of EDTA
- 0.002% Cu - water-soluble copper as a chelate of EDTA
- 0.002% Zn-water-soluble zinc as a chelate of EDTA
- 0.02% Mn water-soluble manganese as a chelate of EDTA
- 0.001% Mo water-soluble molybdenum
This oleander fertilizer is suitable for pouring and spraying and is administered at intervals of 7 to 14 days. Composition:
- 6% N - nitrogen content
- 4% P - phosphate content
- 6% K - potassium content
- Manganese, boron, iron, copper, zinc and molybdenum from high-quality chelate complexes of EDTA
In the spring after clearing the oleander becomes active again. As soon as you see darker and stronger leaves on it, you can start fertilizing for the new season. If you only want to fertilize once or twice a year, it is best to resort to a long-term fertilizer (depot fertilizer). If you use liquid fertilizer, you need to fertilize more often. That can sometimes get out of hand. But an over-fertilization is actually hardly possible, since the oleander needs a lot of nutrients. If it happens to you, simply wash the fertilizer out of the substrate.
Worth knowing about Oleanderdünger shortlyOleander is characterized by the fact that it has a very high need for nutrients and thus must be supplied with sufficient fertilizer in the growth and in the flowering phase. Fertilization is started right after clearing that is done in spring. End of the fertilization phase is then no later than the beginning of September.Later in the fall you should not fertilize the oleander, because the growth is not set at this time. By a fertilization, however, the shoots would not mature properly and then remain soft. For a certain frost hardiness, it is very important that the shoots grow well and lignify. In the winter should not be fertilized. At this time of year the plants are not active and therefore do not consume any nutrients. Only in the spring does the oleander begin again to become active, which can be recognized by the greener and more vigorous leaves. Now is the right time for fertilization:
- For this purpose, blue seed or a long-term fertilizer is used according to the size of the plant.
- The latter should have a lasting effect of six to twelve months and is available in the garden shop or on the Internet.
- The fertilizer is placed in the bucket and a little dug up. Then fresh earth is added.
- In addition, you can also use fertilizer lime and possibly also a potash fertilizer. The shoots become stiffer and more sustainable.
- If you fertilize with blue-grain, then the process is repeated in mid-July and mid-August.