In its natural habitat, the Mediterranean oleander is preferably found in moist places with heavy, clayey and calcareous soil. Such a soil is most comfortable for the plant - which is one of the few container plants that can tolerate waterlogging very well to a certain extent - which is why you should imitate the conditions that occur in nature as closely as possible.
Which soil is suitable for oleander?
The ideal soil for oleanders consists of a mixture of potting soil and loamy garden soil in the same proportions, supplemented with some sand and slow-release fertilizer. This means that the oleander can thrive and bloom optimally in a nutrient-rich substrate that retains moisture well.
Mix potting soil for oleander
Many potted plants do very well in commercial potting soil, but not the oleander. This loose, humus-rich substrate is not the right soil for the flowering shrub. Instead, it's best to mix your oleander soil yourself by mixing potting soil and clay-containing garden soil in approximately the same proportions and, if possible, adding a little sand. Don't forget to mix in a portion of long-term fertilizer (€12.00 on Amazon) with the potting soil so that the oleander receives a good basic supply for the growing season.
Repot oleander once a year
Young oleander plants in particular grow very quickly and should therefore be repotted once a year. You change the substrate every year and choose a slightly larger pot. Older oleanders, on the other hand, only need to be repotted about every five years. Instead of putting the plant in a new container, you cut the roots. If possible, carry out this measure in the spring, immediately after clearing out the winter quarters.
Tip
If your oleander flowers little or not at all, a possible (and very common) cause is a nutrient deficiency. Make sure you have a nutrient-rich substrate (but with only a moderate amount of humus) as well as regular and sufficient fertilization.
