Troubleshooting
Penstemon barbatus 'Rondo' problems — and how to fix them
Penstemon barbatus 'Rondo' (Penstemon barbatus 'Rondo') 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.
Crown / root rot
Caused by waterlogged or heavy soil, especially in winter. Provide sharp drainage and never let the crown sit in moisture.
Leggy, floppy growth
Results from shade or rich soil. Grow in full sun on lean ground to keep the dwarf, compact habit.
Short-lived plants
Barbatus penstemons can be short-lived perennials. Allow some self-seeding or resow 'Rondo' to maintain the planting.
Powdery mildew
Appears in humid, crowded conditions. Space plants for airflow and water at the base rather than overhead.
Prevent penstemon barbatus 'rondo' problems before they start
Most penstemon barbatus 'rondo' issues are care-mismatch, not bad luck. Dial in the basics:
- Common scarlet bugler problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Penstemon barbatus 'Rondo' watering schedule
- Penstemon barbatus 'Rondo' light requirements
- Best soil mix for penstemon barbatus 'rondo'
- Penstemon barbatus 'Rondo' temperature & humidity
- Full penstemon barbatus 'rondo' care guide
Looking for penstemon barbatus 'rondo' in general rather than its problems? Read the full penstemon barbatus 'rondo' care guide — light, water, soil and feeding.
Penstemon barbatus 'Rondo' problems — FAQ
Why is my penstemon barbatus 'rondo' crown / root rot?
Caused by waterlogged or heavy soil, especially in winter. Provide sharp drainage and never let the crown sit in moisture.
Why is my penstemon barbatus 'rondo' leggy, floppy growth?
Results from shade or rich soil. Grow in full sun on lean ground to keep the dwarf, compact habit.
Why is my penstemon barbatus 'rondo' short-lived plants?
Barbatus penstemons can be short-lived perennials. Allow some self-seeding or resow 'Rondo' to maintain the planting.
Why is my penstemon barbatus 'rondo' powdery mildew?
Appears in humid, crowded conditions. Space plants for airflow and water at the base rather than overhead.