Lobelia erinus Waterfall Blue ('Balobwablu'PBR) (Waterfall Series)
trailing lobelia [Waterfall Blue]
A trailing annual, 10-15cm in height and 20-30cm wide, with small, dark green foliage and flowers 2cm across in summer and autumn. The mid blue-purple flowers have three prominent lower lobes and white throats
Size
Ultimate height
0.1–0.5 metresTime to ultimate height
1–2 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Moisture
Moist but well–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | ||||
|---|---|---|---|---|
| Summer | Blue White | Green | ||
| Autumn | Blue White | Green | ||
| Winter |
Position
- Full sun
- Partial shade
Aspect
South–facing or East–facing or North–facing
Exposure
Exposed or Sheltered Hardiness
H2Botanical details
- Family
- Campanulaceae
- Native to the UK
- No
- Foliage
- Deciduous
- Habit
- Trailing
- Genus
Lobelia can be annuals, perennials or shrubs, with simple leaves and showy 2-lipped flowers that may be solitary or in racemes or panicles
- Name status
Trade
How to grow
Cultivation
Grow in deep, fertile, reliably moist soil in full sun or partial shade. Apply a balanced fertilizer every two weeks during spring and early summer and a nitrogen free fertilizer every two weeks from mid-summer onwards
Propagation
Propagate by seed sown at 13-18°C in late winter
Suggested planting locations and garden types
- City and courtyard gardens
- Coastal
- Cottage and informal garden
- Patio and container plants
- Flower borders and beds
- Garden edging
Pruning
Cut back after flowering
Pests
May be susceptible to slugs
Diseases
Generally disease-free
Get involved
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.