Campanula portenschlagiana (Dalmatian bellflower): Characteristic and growing guide

It had been a few days since we had brought to the Agrómatica blog a plant with a large flowering (in number) and with characteristics that make it ideal for rockery gardens, even in mountain climates.

With a prolonged flowering during the summer, we will have a great color in our garden or pot even with  Campanula portenschlagiana.


We must first describe it. It is a plant that can spread and grows low (about 20 cm). One great feature is that it is perennial . Its bright green leaves keep covering the site all year round.

It is a great advantage to not stop having a green carpet. It can be used successfully upholstering walls, abutments or rockery gardens as upholstery.

Actually one of the common names refers to this type of location. It is known as the bell of the walls and it also has a synonym for the scientific name that is very consistent, Campanula muralis.

Although the fact of being a perennial and covering is not without importance, the true ornamental value of this plant lies in its flowering , for several reasons.

First of all it is very durable. It begins in spring (more towards the end) and remains flowery until the end of summer because it can re-bloom a couple of times in this period. Its abundant lilac-purple flowers dress and almost cover the entire vegetative part.

This abundant flowering is due to the fact that the plant has self-pollinating capacity and does not require external pollinators. Even so, it also uses various insects to pollinate itself, so if it occurs to you to plant  Campanula portenschlagiana,  you will be helping to maintain pollinators.

In the following images you can see its excessive flowering and its covering power.

It is of moderate growth and that may or may not be a disadvantage. At first yes because it will cost you to reach its maximum density in 3 to 5 years.

Once this border has been exceeded by more than one, the growth not so fast will seem an advantage so as not to have to be continuously controlling its expansion as it happens with other upholstery. It does not require much control and practically zero pruning.



The truth is that it is a resistant plant. Perennials tend to be because their vegetative parts must withstand cold winters. This one in particular can withstand up to -10ºC approximately without being damaged, which makes it ideal for mountain areas, not very cold but it is already a very considerable resistance to cold.

As for sun exposure, it grows very well in semi-shady conditions, although it will not complain in full sun (considering the cool climate). In full sun in very hot, dry areas, you will hardly be able to cope without substantial “rations” of water.


The soil must be well drained and moist. Drainage is very important so as not to cause root asphyxia. The balance must be found between drainage and soil with constant moderate humidity, without allowing it to dry out completely (in the root zone, not on the surface).

Although it can tolerate nutrient-poor soils, if we want exemplary growth and rapid density of vegetation and flowering, we must nurture the soil.

Compost doses once or twice a year are a good way to maintain good fertility. The pH is not a problem since within a normal soil, it tolerates both slightly acidic, neutral and basic soils without major problem.


  • It can be propagated by seeds although the best way is to do it by division of bushes in spring.
  • It is not attacked by pests very often but in humid environments it can be attacked by slugs and snails as well as typical fungi such as mildew for example.

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