Repotting guide

When & how to repot Gold Dew Tufted Hair Grass (Deschampsia cespitosa 'Goldtau')

Also called Gold dew tufted hair grass, Goldtau hair grass, Golden dew tufted hair grass.

More about gold dew tufted hair grass

About Gold Dew Tufted Hair Grass

Deschampsia cespitosa 'Goldtau' · also called Gold dew tufted hair grass, Goldtau hair grass · flowering

Deschampsia cespitosa 'Goldtau' (meaning 'golden dew' in German) is an outstanding cultivar of tufted hair grass, a cool-season perennial grass native to meadows, moorland, and woodland edges across Europe, northern Asia, and North America. 'Goldtau' is prized for its massive clouds of golden-yellow summer flower panicles that catch and hold dew, glowing when backlit. It thrives in cool, moist conditions and grows actively in spring and autumn rather than the heat of summer. Deschampsia species are not listed as toxic to cats or dogs by the ASPCA.

Mature size: 60–90 cm tall in flower (24–36 in); foliage clump 40–60 cm wide (16–24 in).

Watch for — Rust and leaf spot diseases: Fungal rust (orange-brown pustules) and leaf spot can appear in humid conditions with poor air movement; thin congested clumps every 3–4 years, ensure good spacing, and remove affected foliage.

How to tell gold dew tufted hair grass needs repotting

Repotting on a calendar is less reliable than reading the plant. For gold dew tufted hair grass, watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for gold dew tufted hair grass) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 gold dew tufted hair grass

Only every 2–4 years, when genuinely crowded. Gold Dew Tufted Hair Grass is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Dense, semi-evergreen tussock-forming grass with fine, dark green foliage; produces tall, arching panicles of tiny golden-yellow flowers from early to midsummer on stems well above the foliage mound..

What size pot to step gold dew tufted hair grass up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Gold Dew Tufted Hair Grass positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping gold dew tufted hair grass into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 gold dew tufted hair grass

Early spring, just as new growth restarts, is the ideal window for gold dew tufted hair grass. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting gold dew tufted hair grass

Confirm it actually needs it. Slide gold dew tufted hair grass out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip gold dew tufted hair grass out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh moist, humus-rich loam; tolerates moderately acidic to neutral soils, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water gold dew tufted hair grass again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for gold dew tufted hair grass

Gold Dew Tufted Hair Grass wants moist, humus-rich loam; tolerates moderately acidic to neutral soils. Prefers a moisture-retentive, fertile loam; performs well on slightly acidic soils (pH 5.5–7.0); avoid hot, dry, alkaline, or sandy soils where it may struggle in summer. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting gold dew tufted hair grass — frequently asked questions

How often should you repot gold dew tufted hair grass?

Only every 2–4 years, when genuinely crowded for gold dew tufted hair grass. Only repot gold dew tufted hair grass every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using moist, humus-rich loam; tolerates moderately acidic to neutral soils. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does gold dew tufted hair grass need?

When is the best time of year to repot gold dew tufted hair grass?

Does gold dew tufted hair grass like to be root-bound?

Yes — gold dew tufted hair grass genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise gold dew tufted hair grass after repotting?

Not immediately. Wait about 4 weeks after repotting gold dew tufted hair grass. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.