Caucasian stonecrop vs Serbian bellflower

Caucasian stonecrop and Serbian bellflower are often considered for the same spot in the garden (ground cover, flowers, pollinator friendly, container). The data below shows where they differ: size, hardiness, care, toxicity and price.

Caucasian stonecrop

Sedum spurium 15 cm × 90 cm after 10 years

A low, succulent ground cover that quickly knits a dense mat with its rooting stems and is covered in pink, red or white starry flowers in summer,…

Ground cover

Full sun

Part shade

from about PLN 13

Serbian bellflower

Campanula poscharskyana 15 cm × 60 cm after 10 years

A vigorous bellflower with trailing stems that are smothered in star-shaped lavender-blue flowers from late spring into summer, often blooming again…

Ground cover

Full sun

Part shade

from about PLN 7.90

Key differences

Caucasian stonecrop spreads wider: 15 cm × 90 cm after ten years, against 15 cm × 60 cm for Serbian bellflower.
Caucasian stonecrop tolerates drought better than Serbian bellflower.
Caucasian stonecrop needs less water than Serbian bellflower.
Serbian bellflower also takes heavy clay, Caucasian stonecrop needs a loose, free-draining soil.
Serbian bellflower is cheaper: about PLN 8.80 at the size usually planted, against about PLN 13 for Caucasian stonecrop.

Which one to choose?

Caucasian stonecrop is the better choice if you cannot water regularly.

Serbian bellflower is the better choice if the soil is heavy clay or price matters.

Watch out for

Caucasian stonecrop

In Central Europe it escapes from gardens easily and can crowd out native plants in dry grassland and rocky habitats; Switzerland has banned its sale and the German nature conservation agency has assessed it as invasive. Do not plant it near natural or rocky grassland or protected areas, and do not dump broken stem pieces on the compost or at the garden edge, because they root. In wet, heavy soil the crown rots, and slugs and snails may chew the young shoots.

Serbian bellflower

Slugs and snails readily eat it, especially the fresh shoots in spring. It spreads strongly: it smothers weaker neighbours, roots into the joints of walls and paving and also self-seeds, so cut back its edges every year. Powdery mildew can appear in stuffy, dry spots. In Central Europe the foliage may scorch in full sun on hot summer afternoons, so give it part shade in such places.

The data side by side

Feature	Caucasian stonecrop	Serbian bellflower
Group	Ground cover	Ground cover
Size after 10 years	15 cm × 90 cm	15 cm × 60 cm
Ultimate size	5–15 cm × 45–90 cm	10–30 cm × 30–60 cm (uncertain)
Growth rate	Fast (uncertain)	Fast
Light	Full sun, Part shade	Full sun, Part shade
Soil	Average garden soil, Sandy, Calcareous	Average garden soil, Clay, Sandy, Calcareous
Hardiness	down to -34 °C (USDA 4, RHS H7)	down to -40 °C (USDA 3, RHS H7)
Heat tolerance	High	Medium (uncertain)
Foliage	Semi-evergreen	Semi-evergreen
Flowering	June–August, pink, red, white	May–September, purple, blue, white
Water need	Low	Medium
Drought tolerance	High	Medium
Maintenance	Low	Low
Planting distance	30 cm	30 cm
For dogs	no data	Non-toxic (uncertain)
For cats	no data	Non-toxic (uncertain)
For children	Mildly toxic (uncertain)	Non-toxic (uncertain)
Typical price	approx. PLN 13	approx. PLN 8.80

Prices are rounded, indicative values. Toxicity data is for information only. If your pet or child has eaten a plant, contact a vet or a doctor. Data updated: October 17, 2026

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