Repotting guide

When & how to repot Tender and True Parsnip (Pastinaca sativa)

Also called Parsnip, Hollow Crown Parsnip.

More about tender and true parsnip

About Tender and True Parsnip

Pastinaca sativa · also called Parsnip, Hollow Crown Parsnip · edible

Tender and True is a time-tested British heirloom parsnip variety prized for its long, smooth, canker-resistant roots with a sweet, nutty flavour that intensifies after frost. One of the finest exhibition and kitchen varieties. Not ASPCA-listed; parsnip sap is phototoxic to skin but poses minimal internal risk to pets.

Mature size: Roots 25-35 cm long, 6-8 cm across the shoulder; foliage 40-60 cm

Watch for — 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.

How to tell tender and true parsnip needs repotting

Repotting on a calendar is less reliable than reading the plant. For tender and true parsnip, watch for these signs:

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot tender and true parsnip on before it becomes hard root-bound.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot tender and true parsnip

Pot on seedlings as they grow; not a perennial repot. Tender and True Parsnipis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Low rosette of pinnate leaves with a deep, fleshy taproot.

What size pot to step tender and true parsnip up to

Pot tender and true parsnip on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot tender and true parsnip

Pot tender and true parsnip on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting tender and true parsnip

Pot on before it is root-bound. Check tender and true parsnip regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
Pot into rich mix. Set it into fresh deep, light, stone-free sandy loam or well-prepared loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water tender and true parsnip in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for tender and true parsnip

Tender and True Parsnip wants deep, light, stone-free sandy loam or well-prepared loam. The most critical factor is depth and freedom from stones — rocky soils cause forked, multi-pronged roots. Deeply dug, non-freshly-manured beds (avoid direct manure which forks roots) with pH 6.0-7.0 are ideal. Raised beds work very well. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tender and true parsnip — frequently asked questions

How often should you repot tender and true parsnip?

Pot on seedlings as they grow; not a perennial repot for tender and true parsnip. Tender and True Parsnip is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into deep, light, stone-free sandy loam or well-prepared loam so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does tender and true parsnip need?

When is the best time of year to repot tender and true parsnip?

Can you put tender and true parsnip straight into a much bigger pot?

No. Even a fast-growing tender and true parsnip should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise tender and true parsnip after repotting?

Not immediately. Wait about 1 week after repotting tender and true parsnip. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.