Repotting guide

When & how to repot String of needles (Ceropegia linearis)

Also called string of needles, needle vine, Ceropegia linearis.

More about string of needles

About String of needles

Ceropegia linearis · also called string of needles, needle vine · houseplant

String of needles is a trailing South African succulent, a close relative of string of hearts, with slender needle-thin green leaves on wiry stems. It wants bright indirect light and sparse watering, and roots easily from cuttings. Treat as mildly toxic to pets and keep the strands out of reach.

Mature size: Trailing up to 1.8 m (6 ft); slow-growing, around 15-20 cm of new growth per season

How to tell string of needles needs repotting

Repotting on a calendar is less reliable than reading the plant. For string of needles, 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 string of needles

Every 2–3 years, into bone-dry mix. String of needles's growth habit — trailing succulent vine — sets the pace. String of needles is a trailing South African succulent, a close relative of string of hearts, with slender needle-thin green leaves on wiry stems. It wants bright indirect light and sparse watering, and roots easily from cuttings. Treat as mildly toxic to pets and keep the strands out of reach.

What size pot to step string of needles up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. String of needles 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 string of needles

Spring or summer, while string of needles 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 string of needles

Repot dry. Do not water string of needles 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 free-draining succulent 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 string of needles 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 string of needles 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 string of needles

String of needles wants free-draining succulent mix. Cactus and succulent mix with extra perlite or sand for fast drainage; always use a pot with drainage holes. Prefers to stay slightly root-bound. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting string of needles — frequently asked questions

How often should you repot string of needles?

Every 2–3 years, into bone-dry mix for string of needles. Repot string of needles every 2–3 years into a snug pot of free-draining succulent 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 string of needles need?

When is the best time of year to repot string of needles?

Should you water string of needles after repotting?

No — not straight away. Repot string of needles 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 string of needles after repotting?

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