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Annual · Campanulaceae family

Edging lobelia

Lobelia erinus

Full sun to part shade 0.15–0.25 m × 0.15–0.3 m Flowers April–June Moderate care
Flower colours Click a colour

In short a 10-second read

SunFull sun to part shade
Size0.15–0.25 m
spacing 20 cm
FlowersApril–June
Care levelModerate care

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun to part shade, in average to moist soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
average to moisthumus-richloamy

Watering

keep the soil evenly moistless when it rains

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

50 cm1 m1.5 m0.15–0.25 mspread 0.15–0.3 m
0.15–0.25 m× spread 0.15–0.3 m

Plant 20 cm apart.

The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Months for Central Europe. The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberSowing: JanuarySowing: FebruarySowing: MarchSowing: AprilSowing: MaySowing: JuneSowing: JulySowing: AugustSowing: SeptemberSowing: OctoberSowing: NovemberSowing: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersSowingFeeding
Now, in October: nothing to do — the next job is in February.
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

April–June · blue, purple, pink, white or red

Sowing

JanFebMarAprMayJunJulAugSepOctNovDec

sow indoors: February–March

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

April–May

Feeding

Nutrition.

Horn meal

up to 90 g/m² a year, if the soil needs it · April–May

JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

What you will see

Irregular holes in leaves and slime trails, especially on young plants in damp weather.

How to protect

  1. Prevention
    • Changing growing practices is the best strategy; protect young plants.
  2. By handEvening collection by torchlight in damp weather; barriers (copper tape, wool pellets).
  3. Biological moist, warm soilPhasmarhabditis hermaphrodita nematodes watered into the soil.
Slugs and snailspest

What you will see

Irregular holes in leaves and slime trails, especially on young plants in damp weather.

How to protect

  1. Prevention
    • Changing growing practices is the best strategy; protect young plants.
  2. By handEvening collection by torchlight in damp weather; barriers (copper tape, wool pellets).
  3. Biological moist, warm soilPhasmarhabditis hermaphrodita nematodes watered into the soil.
More about this problem
Sources (2)

What to combine it with

Same needs, different flowering.

They share the same sun and soil and flower in other months — so the bed flowers for longer.

ivy geranium

ivy geranium

0.1–0.6 m
✓flowers June–October
✓taller — for the back
common heather

common heather

0.1–0.6 m
✓flowers July–October
✓taller — for the back
French marigold

French marigold

0.15–0.3 m
✓flowers June–October
✓taller — for the back

Frequently asked

Quick answers.

When does Edging lobelia flower?

In April–June; the flowers are blue, purple, pink, white or red.

When do I sow Edging lobelia?

In February–March (sow indoors).

Does Edging lobelia tolerate shade?

It tolerates part shade (3–6 hours of sun), but not full shade.

How much space does Edging lobelia need?

At maturity 0.15–0.3 m wide and 0.15–0.25 m tall; recommended spacing 20 cm.

Slugs and snails — what can you do?

Changing growing practices is the best strategy; protect young plants. Evening collection by torchlight in damp weather; barriers (copper tape, wool pellets).

Sources (16) Checked 28 September 2026

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