Repotting guide

When & how to repot Cistus-Flowered Sundew (Drosera cistiflora)

Also called cistus-flowered sundew.

More about cistus-flowered sundew

About Cistus-Flowered Sundew

Drosera cistiflora · also called cistus-flowered sundew · houseplant

Drosera cistiflora is a spectacular tuberous sundew from South Africa's Western Cape, prized for its unusually large, showy flowers — typically deep red, pink, or white — that rival a rockrose in size. It follows a Mediterranean-type seasonal cycle: active in the cool, wet winter and dormant as a tuber through the hot, dry summer.

Mature size: 20–40 cm tall in leaf; tuber 1–2 cm diameter

Watch for — Tuber rot during dormancy: If any moisture reaches the dormant tuber over summer, it will rot. After growth dies back, cease all watering and leave the pot dry in a warm spot (25–35°C) until autumn. Do not check or disturb the tuber unnecessarily.

How to tell cistus-flowered sundew needs repotting

Repotting on a calendar is less reliable than reading the plant. For cistus-flowered sundew, watch for these signs:

Flowering has tailed off year on year and the clump has become congested and overcrowded.
Lots of leaf and few flowers — a classic sign that cistus-flowered sundew bulbs or tubers need lifting and dividing.
Bulbs visibly bursting the pot or pushing each other to the surface.
It is the natural dormancy window (foliage yellowed and died back) — the only safe time to lift and split.

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 cistus-flowered sundew

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, cistus-flowered sundew is lifted and divided once the clump congests and flowering drops off. Tuberous geophyte producing a slender upright or arching stem to 30 cm in the growing season, clothed in stalked carnivorous leaves. Dies back to a deep-set tuber in summer. Produces one or more conspicuously large flowers (3–5 cm across) in late winter to spring..

What size pot to step cistus-flowered sundew up to

Pot size matters less than depth and spacing here. When you replant cistus-flowered sundew, set the bulbs or tubers at the correct depth (a rough guide: two to three times their own height of soil over the top) and space them so they are not touching. A wide, shallow pot suits a clump better than a tall narrow one.

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 cistus-flowered sundew

The only safe window is dormancy: wait until the foliage has yellowed and died back naturally, lift and divide then, and replant before or at the start of the next growing season. Disturbing cistus-flowered sundew in full growth or flower sets it back badly.

Step-by-step: repotting cistus-flowered sundew

Wait for dormancy. Let cistus-flowered sundew foliage yellow and die back completely. Lifting while it is in growth wastes the energy it is storing for next year.
Lift carefully. Loosen the soil well away from the bulbs/tubers with a fork and ease the whole clump out without spearing them.
Separate the offsets. Gently pull the clump apart into individual bulbs or tubers. Keep only firm, healthy, blemish-free ones.
Replant at the right depth. Reset them in fresh very well-drained, low-nutrient sandy mix at the correct depth and spacing — not touching — so each has room to bulk up.
Water in and rest. Water once to settle them, then keep on the dry side until growth resumes. Do not feed until leaves are actively growing.

Aftercare

After replanting cistus-flowered sundew, keep the soil barely moist — not wet — until shoots appear; bulbs and tubers rot in cold, saturated soil. Once leaves are growing strongly, resume normal watering. Hold off feeding until the plant is in active growth again.

The right soil mix for cistus-flowered sundew

Cistus-Flowered Sundew wants very well-drained, low-nutrient sandy mix. Use 60–70% washed coarse sand with 30–40% peat or coir — a much sandier, more free-draining mix than most sundews require, reflecting the sandy fynbos soils of its natural habitat. Absolute zero fertiliser or organic enrichment. pH 4.5–6.0. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting cistus-flowered sundew — frequently asked questions

How often should you repot cistus-flowered sundew?

Lift and divide every 3–4 years once clumps congest for cistus-flowered sundew. Cistus-Flowered Sundew is lifted and divided, not "repotted". Every 3–4 years, once the foliage has died back and it is dormant, lift the clump, separate the offsets, and replant at the correct depth in very well-drained, low-nutrient sandy mix. Crowding, not pot size, is what reduces flowering over time.

What size pot does cistus-flowered sundew need?

When is the best time of year to repot cistus-flowered sundew?

Do you "repot" cistus-flowered sundew, or lift and divide it?

You lift and divide it. Cistus-Flowered Sundew grows from bulbs or tubers, so instead of repotting you wait for dormancy, lift the congested clump, separate the healthy offsets, and replant them at the right depth and spacing. Doing this every 3–4 years restores flowering.

Should you fertilise cistus-flowered sundew after repotting?

Hold off feeding cistus-flowered sundew until it is in active growth again. Fresh soil already carries enough nutrients to get it re-established, and feeding disturbed roots too soon does more harm than good.