Troubleshooting
Crystal Palace Lobelia problems — and how to fix them
Crystal Palace Lobelia (Lobelia erinus) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Mid-summer dormancy
Plants stop flowering in prolonged heat; cut back by half, water well, and apply a balanced liquid feed — a fresh flush of flowers should follow when temperatures drop.
Root rot
Waterlogged containers cause sudden wilting; ensure drainage holes are clear and reduce watering frequency during cool, wet spells.
Damping off in seedlings
Seedlings collapse at the base in cold, wet seed compost; use sterile, well-drained seed mix and water sparingly until plants are established.
Aphids
Small colonies on soft new growth; treat with insecticidal soap or a dilute neem oil spray.
Legginess
Plants stretched in insufficient light; deadhead and trim lightly to restore compact, bushy habit and relocate to a brighter position.
Prevent crystal palace lobelia problems before they start
Most crystal palace lobelia issues are care-mismatch, not bad luck. Dial in the basics:
Crystal Palace Lobelia problems — FAQ
Why is my crystal palace lobelia mid-summer dormancy?
Plants stop flowering in prolonged heat; cut back by half, water well, and apply a balanced liquid feed — a fresh flush of flowers should follow when temperatures drop.
Why is my crystal palace lobelia root rot?
Waterlogged containers cause sudden wilting; ensure drainage holes are clear and reduce watering frequency during cool, wet spells.
Why is my crystal palace lobelia damping off in seedlings?
Seedlings collapse at the base in cold, wet seed compost; use sterile, well-drained seed mix and water sparingly until plants are established.
Why is my crystal palace lobelia aphids?
Small colonies on soft new growth; treat with insecticidal soap or a dilute neem oil spray.
Why is my crystal palace lobelia legginess?
Plants stretched in insufficient light; deadhead and trim lightly to restore compact, bushy habit and relocate to a brighter position.