Troubleshooting
Lysimachia nummularia problems — and how to fix them
Lysimachia nummularia (Lysimachia nummularia) 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.
Invasive spread
Roots wherever stems touch moist soil and can swamp smaller neighbours or escape into lawns and waterways. It is listed as invasive in parts of North America; site it where it can be contained or grow it in pots.
Leaf scorch in dry sun
In full sun with dry roots the foliage browns and thins. Keep the soil reliably moist or move it to part shade in hot regions.
Bare, leggy centres
Old mats can go thin and woody in the middle. Shear or pull out tired growth to encourage fresh rooting runners.
Rust and leaf spot
Crowded, damp foliage occasionally develops rust or fungal leaf spots. Thin congested growth and clear fallen debris to improve airflow.
Prevent lysimachia nummularia problems before they start
Most lysimachia nummularia issues are care-mismatch, not bad luck. Dial in the basics:
Lysimachia nummularia varieties: common problems
Looking for lysimachia nummularia in general rather than its problems? Read the full lysimachia nummularia care guide — light, water, soil and feeding.
Lysimachia nummularia problems — FAQ
Why is my lysimachia nummularia invasive spread?
Roots wherever stems touch moist soil and can swamp smaller neighbours or escape into lawns and waterways. It is listed as invasive in parts of North America; site it where it can be contained or grow it in pots.
Why is my lysimachia nummularia leaf scorch in dry sun?
In full sun with dry roots the foliage browns and thins. Keep the soil reliably moist or move it to part shade in hot regions.
Why is my lysimachia nummularia bare, leggy centres?
Old mats can go thin and woody in the middle. Shear or pull out tired growth to encourage fresh rooting runners.
Why is my lysimachia nummularia rust and leaf spot?
Crowded, damp foliage occasionally develops rust or fungal leaf spots. Thin congested growth and clear fallen debris to improve airflow.