Repotting guide

When & how to repot Brown Spiderwort (Siderasis fuscata)

Also called Teddy Bear Plant, Hairy Spiderwort, Bear's Ear.

More about brown spiderwort

About Brown Spiderwort

Siderasis fuscata · also called Teddy Bear Plant, Hairy Spiderwort · houseplant

Brown Spiderwort is a compact rosette-forming Brazilian perennial in the Commelinaceae family. It has broad, velvety dark green leaves densely covered in rust-brown hairs, with vivid purple undersides. Small violet-purple flowers appear sporadically. A rewarding terrarium plant. Classified mildly-toxic based on family membership, as ASPCA data for the genus is unavailable.

Mature size: 20-30 cm tall; spreading to 30 cm

Watch for — Root rot from overwatering: Allow the top soil to dry between waterings. Use a well-draining mix and pot with drainage holes.

How to tell brown spiderwort needs repotting

Repotting on a calendar is less reliable than reading the plant. For brown 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 brown 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 brown spiderwort

Only every 2–4 years, when genuinely crowded. Brown 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, rosette-forming perennial.

What size pot to step brown spiderwort up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Brown 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 brown 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 brown spiderwort

Early spring, just as new growth restarts, is the ideal window for brown 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 brown spiderwort

Confirm it actually needs it. Slide brown 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 brown 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 well-draining peat-free potting compost, 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 brown 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 brown spiderwort

Brown Spiderwort wants well-draining peat-free potting compost. A moisture-retentive but free-draining peat-free compost with added perlite suits this plant. Slightly acidic pH of 5.5-6.5 is ideal. Excellent drainage prevents root rot in the humid conditions it prefers. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting brown spiderwort — frequently asked questions

How often should you repot brown spiderwort?

Only every 2–4 years, when genuinely crowded for brown spiderwort. Only repot brown 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 well-draining peat-free potting compost. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does brown spiderwort need?

When is the best time of year to repot brown spiderwort?

Does brown spiderwort like to be root-bound?

Yes — brown 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 brown spiderwort after repotting?

Not immediately. Wait about 4 weeks after repotting brown 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.