Repotting guide

When & how to repot Celtic Valerian (Valeriana celtica)

Also called Celtic Valerian, Alpine Valerian, Nard, Valeriana Spikenard.

More about celtic valerian

About Celtic Valerian

Valeriana celtica · also called Celtic Valerian, Alpine Valerian · herb

A rare, compact alpine perennial endemic to the Eastern Alps and adjacent Graian and Pennine Alps, growing at 1,800–2,800 m on acidic, rocky pastures. Historically traded as an aromatic spice and incense ('nard'). Its small, grassy leaves and tiny yellowish-pink flowers suit scree gardens and troughs.

Mature size: 5–15 cm tall, 10–20 cm spread

Watch for — Crown rot at low elevations: Warm, humid summers and wet winters are the greatest threat. Grow in perfectly drained scree or a raised bed with a grit collar around the crown. Pot in an alpine house over winter in very wet climates.

How to tell celtic valerian needs repotting

Repotting on a calendar is less reliable than reading the plant. For celtic valerian, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 celtic valerian

Every 2–3 years, into bone-dry mix. Celtic Valerian's growth habit — compact, mat-forming herbaceous perennial; short grassy basal leaves with erect, slender flowering stems — sets the pace. A rare, compact alpine perennial endemic to the Eastern Alps and adjacent Graian and Pennine Alps, growing at 1,800–2,800 m on acidic, rocky pastures. Historically traded as an aromatic spice and incense ('nard'). Its small, grassy leaves and tiny yellowish-pink flowers suit scree gardens and troughs.

What size pot to step celtic valerian up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Celtic Valerian stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 celtic valerian

Spring or summer, while celtic valerian is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting celtic valerian

Repot dry. Do not water celtic valerian for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty sharply drained, acidic, gritty or stony loam, ph 4.5–6.0 ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set celtic valerian at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep celtic valerian completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for celtic valerian

Celtic Valerian wants sharply drained, acidic, gritty or stony loam, ph 4.5–6.0. A strict calcifuge — must have acid, humus-poor, rocky or gritty soil. Use a 50:50 mix of alpine grit and ericaceous compost. Excellent drainage is non-negotiable; the plant rots quickly in wet, clay-heavy or alkaline soils. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting celtic valerian — frequently asked questions

How often should you repot celtic valerian?

Every 2–3 years, into bone-dry mix for celtic valerian. Repot celtic valerian every 2–3 years into a snug pot of sharply drained, acidic, gritty or stony loam, ph 4.5–6.0, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does celtic valerian need?

When is the best time of year to repot celtic valerian?

Should you water celtic valerian after repotting?

No — not straight away. Repot celtic valerian into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise celtic valerian after repotting?

Not immediately. Wait about 3 weeks after repotting celtic valerian. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.