Sentimental Blue
Sentimental Blue is a dwarf balloon flower, a compact form of Platycodon grandiflorus with abundant blue flowers on short stems. It excels in containers, rock gardens, and the front of borders. Plants prefer full sun to light shade, well-drained soil, and steady moisture. Trials in the upper Midwest noted a tidy mound and steady bloom from early July into September.
At‑a‑glance
Group/Class: dwarf selection
Height × spread: 10-12 in (25-30 cm) × 10-12 in (25-30 cm)
Bloom window: early July to early September
Color & flower form: blue; single, star-shaped
Fragrance: 0 none
USDA hardiness: zones 3-8
Breeder / Year / Origin: unknown
Cut-flower notes: very short stems; best for small vessels; sear cut ends to prevent sap bleed
Pet safety: unknown
How it differs
- Much shorter than typical balloon flower.
- Dense, mounded habit for tight spaces.
- Less likely to need staking.
- Flowers heavily for its size.
Strengths
- Reliable dwarf habit for edging and pots.
- Long bloom season with deadheading.
- Cold hardy in northern regions.
- Low maintenance in average soils.
Care in one minute
Light: full sun to light shade.
Soil: fertile, well-drained; slightly acidic to neutral.
Water: consistent moisture; avoid saturated conditions.
Feeding: light spring feeding only.
Grooming: deadhead; optional light trim in late spring to maintain shape.
Winter: mulch lightly; avoid disturbing crowns.
Watch‑outs
- Can stretch in shade.
- Dislikes frequent division or transplanting.
- Shoots emerge late; mark the site to avoid damage.
Best uses (tags)
containers, edging, rock gardens, borders, small arrangements
Provenance note
Evaluated as a compact cultivar in public trials, where plants averaged about 12 inches tall.
References
- Chicago Botanic Garden – Platycodon cultivar trial (Sentimental Blue performance)
- NC State Extension – Platycodon grandiflorus profile
- Missouri Botanical Garden – Platycodon grandiflorus (Plant Finder)
Written by: Your Flowers Guide editorial team
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