Troubleshooting
Tender and True Parsnip problems — and how to fix them
Tender and True Parsnip (Pastinaca sativa) 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.
Canker (Itersonilia pastinacae)
Orange-brown rot at the root shoulder is the main disease of parsnips. Tender and True has good resistance; ensure consistent moisture and avoid root damage when thinning.
Poor or erratic germination
Parsnip seed viability drops quickly — always use fresh seed sown the same year. Germination takes 2-4 weeks at 10-15°C; do not be hasty to re-sow.
Carrot fly
Larvae tunnel into roots leaving rusty tunnels. Use fine mesh fleece barriers or grow alongside onions as a deterrent.
Forked/multi-rooted growth
Caused by stones, clods, or fresh manure in the soil. Double-dig and remove all obstacles before sowing.
Canopy photosensitivity
Do not touch foliage on sunny days without gloves — the sap of Apiaceae members can cause serious skin blistering in humans (phytophotodermatitis).
Prevent tender and true parsnip problems before they start
Most tender and true parsnip issues are care-mismatch, not bad luck. Dial in the basics:
Tender and True Parsnip problems — FAQ
Why is my tender and true parsnip canker (itersonilia pastinacae)?
Orange-brown rot at the root shoulder is the main disease of parsnips. Tender and True has good resistance; ensure consistent moisture and avoid root damage when thinning.
Why is my tender and true parsnip poor or erratic germination?
Parsnip seed viability drops quickly — always use fresh seed sown the same year. Germination takes 2-4 weeks at 10-15°C; do not be hasty to re-sow.
Why is my tender and true parsnip carrot fly?
Larvae tunnel into roots leaving rusty tunnels. Use fine mesh fleece barriers or grow alongside onions as a deterrent.
Why is my tender and true parsnip forked/multi-rooted growth?
Caused by stones, clods, or fresh manure in the soil. Double-dig and remove all obstacles before sowing.
Why is my tender and true parsnip canopy photosensitivity?
Do not touch foliage on sunny days without gloves — the sap of Apiaceae members can cause serious skin blistering in humans (phytophotodermatitis).