Troubleshooting
Liquorice problems — and how to fix them
Liquorice (Glycyrrhiza glabra) 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 spreading via stolons
Liquorice spreads aggressively via underground stolons and can become weedy. Install root barriers 40–50 cm deep around the planting area, or grow in large, deep containers to contain spread. Remove unwanted shoots promptly before they establish.
Root rot in poorly drained soil
Heavy or waterlogged soils cause root and crown rot, leading to plant collapse. Ensure excellent drainage — raise beds or mound planting positions by 15–20 cm. In persistently wet regions, grow in large containers with a fast-draining mix.
Slow establishment and patience required for harvest
Roots reach usable size only after 3–4 years. Premature harvest yields thin, bitter roots lacking glycyrrhizin. Mark plants clearly and resist harvesting early; use the waiting period to allow the colony to establish and expand.
Prevent liquorice problems before they start
Most liquorice issues are care-mismatch, not bad luck. Dial in the basics:
Liquorice problems — FAQ
Why is my liquorice invasive spreading via stolons?
Liquorice spreads aggressively via underground stolons and can become weedy. Install root barriers 40–50 cm deep around the planting area, or grow in large, deep containers to contain spread. Remove unwanted shoots promptly before they establish.
Why is my liquorice root rot in poorly drained soil?
Heavy or waterlogged soils cause root and crown rot, leading to plant collapse. Ensure excellent drainage — raise beds or mound planting positions by 15–20 cm. In persistently wet regions, grow in large containers with a fast-draining mix.
Why is my liquorice slow establishment and patience required for harvest?
Roots reach usable size only after 3–4 years. Premature harvest yields thin, bitter roots lacking glycyrrhizin. Mark plants clearly and resist harvesting early; use the waiting period to allow the colony to establish and expand.