Repotting guide

When & how to repot Tradescantia Sillamontana (Tradescantia sillamontana)

Also called white velvet tradescantia, cobweb spiderwort, hairy wandering Jew.

More about tradescantia sillamontana

About Tradescantia Sillamontana

Tradescantia sillamontana · also called white velvet tradescantia, cobweb spiderwort · tropical

Tradescantia sillamontana is an unusual spiderwort from arid Mexico, its olive-green leaves cloaked in dense white woolly hairs that give a cobwebbed, silvery look. More drought-tolerant than typical tradescantias, it loves bright light and well-drained soil, and bears small magenta-pink flowers. Easy and fast-growing, but toxic and an irritant to pets.

Mature size: About 30-40 cm tall, with stems trailing or sprawling to 30-45 cm; pinch to keep dense and bushy.

Watch for — Leggy growth and loss of hairs: Too little light stretches stems and reduces the white wool. Give brighter light, including some direct sun, and pinch tips regularly to stay compact.

How to tell tradescantia sillamontana needs repotting

Repotting on a calendar is less reliable than reading the plant. For tradescantia sillamontana, 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 tradescantia sillamontana

Every 2–3 years, into bone-dry mix. Tradescantia Sillamontana's growth habit — upright-then-trailing, semi-succulent perennial that forms a clump of fuzzy white stems; sprawls and roots at the nodes as it lengthens. — sets the pace. Tradescantia sillamontana is an unusual spiderwort from arid Mexico, its olive-green leaves cloaked in dense white woolly hairs that give a cobwebbed, silvery look. More drought-tolerant than typical tradescantias, it loves bright light and well-drained soil, and bears small magenta-pink flowers. Easy and fast-growing, but toxic and an irritant to pets.

What size pot to step tradescantia sillamontana up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Tradescantia Sillamontana 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 tradescantia sillamontana

Spring or summer, while tradescantia sillamontana 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 tradescantia sillamontana

Repot dry. Do not water tradescantia sillamontana 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 gritty, free-draining potting mix 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 tradescantia sillamontana 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 tradescantia sillamontana 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 tradescantia sillamontana

Tradescantia Sillamontana wants gritty, free-draining potting mix. A houseplant mix amended with extra perlite, coarse sand or grit, or a cactus-and-succulent mix, gives the sharp drainage it needs. Slightly acidic to neutral pH is fine; the key is fast-draining soil that never stays wet. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tradescantia sillamontana — frequently asked questions

How often should you repot tradescantia sillamontana?

Every 2–3 years, into bone-dry mix for tradescantia sillamontana. Repot tradescantia sillamontana every 2–3 years into a snug pot of gritty, free-draining potting mix, 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 tradescantia sillamontana need?

When is the best time of year to repot tradescantia sillamontana?

Should you water tradescantia sillamontana after repotting?

No — not straight away. Repot tradescantia sillamontana 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 tradescantia sillamontana after repotting?

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