Repotting guide

When & how to repot Long-stalked Spiderwort (Tradescantia longipes)

Also called Long-stalked Spiderwort, Wild Crocus.

More about long-stalked spiderwort

About Long-stalked Spiderwort

Tradescantia longipes · also called Long-stalked Spiderwort, Wild Crocus · flowering

Tradescantia longipes is a low-growing, clump-forming native perennial endemic to the rocky, wooded slopes of the Ozark Mountains of southern Missouri and northern Arkansas. It produces deep blue-violet three-petalled flowers with fringed yellow stamens on long, slender stalks in succession from April to June, then the foliage dies back significantly after bloom. The most important care point is that it needs partial to full shade and consistent moisture to replicate its Ozark woodland habitat. As with other Tradescantia species, treat as mildly toxic to pets given the ASPCA listing of T. fluminensis in the genus.

Mature size: 15–23 cm (6–9 in) tall in bloom and 15–23 cm (6–9 in) wide at maturity.

How to tell long-stalked spiderwort needs repotting

Repotting on a calendar is less reliable than reading the plant. For long-stalked spiderwort, 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 long-stalked spiderwort) 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 long-stalked spiderwort

Only every 2–4 years, when genuinely crowded. Long-stalked Spiderwort 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. Low-growing, clump-forming herbaceous perennial; foliage dies back significantly after the spring flowering period..

What size pot to step long-stalked spiderwort up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Long-stalked Spiderwort 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 long-stalked spiderwort 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 long-stalked spiderwort

Early spring, just as new growth restarts, is the ideal window for long-stalked spiderwort. 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 long-stalked spiderwort

Confirm it actually needs it. Slide long-stalked spiderwort 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 long-stalked spiderwort 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, well-drained loam; slightly acidic preferred, 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 long-stalked spiderwort 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 long-stalked spiderwort

Long-stalked Spiderwort wants moist, humus-rich, well-drained loam; slightly acidic preferred. Prefers moist, acidic woodland soil rich in organic matter; tolerates rocky or poor soil but benefits from a leaf-mould mulch to retain moisture and replicate its natural woodland floor conditions. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting long-stalked spiderwort — frequently asked questions

How often should you repot long-stalked spiderwort?

Only every 2–4 years, when genuinely crowded for long-stalked spiderwort. Only repot long-stalked spiderwort 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, well-drained loam; slightly acidic preferred. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does long-stalked spiderwort need?

When is the best time of year to repot long-stalked spiderwort?

Does long-stalked spiderwort like to be root-bound?

Yes — long-stalked spiderwort 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 long-stalked spiderwort after repotting?

Not immediately. Wait about 4 weeks after repotting long-stalked spiderwort. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.