Repotting guide

When & how to repot Munby's Rock Rose (Cistus munbyi)

Also called Munby's rock rose.

More about munby's rock rose

About Munby's Rock Rose

Cistus munbyi · also called Munby's rock rose · flowering

Cistus munbyi is a small, evergreen shrub native to the low-elevation Mediterranean coasts of Morocco and Algeria, where it grows in dry, sunny, alkaline scrubland at up to 100 m altitude. It produces white flowers above narrow, linear leaves with revolute (downward-rolled) margins, and is strongly adapted to hot, dry, well-drained conditions. Because it hails from a mild coastal climate it has limited frost tolerance and should be given a sheltered, sunny position or brought under cover in cold winters. Cistus is not listed by the ASPCA as explicitly non-toxic; treat as mildly toxic as a precaution.

Mature size: 50–80 cm tall by 80–120 cm wide (20–32 in × 32–48 in).

Watch for — Frost damage and dieback: More frost-tender than many rock roses due to its North African coastal origin; temperatures below 0°C (32°F) can damage stems. Protect with horticultural fleece or grow in a pot that can be moved under cover in winter.

How to tell munby's rock rose needs repotting

Repotting on a calendar is less reliable than reading the plant. For munby's rock rose, 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 munby's rock rose

Every 2–3 years, into bone-dry mix. Munby's Rock Rose's growth habit — compact, spreading evergreen shrub with narrow, linear leaves; lower and neater than many cistus species. — sets the pace. Cistus munbyi is a small, evergreen shrub native to the low-elevation Mediterranean coasts of Morocco and Algeria, where it grows in dry, sunny, alkaline scrubland at up to 100 m altitude. It produces white flowers above narrow, linear leaves with revolute (downward-rolled) margins, and is strongly adapted to hot, dry, well-drained conditions. Because it hails from a mild coastal climate it has limited frost tolerance and should be given a sheltered, sunny position or brought under cover in cold winters. Cistus is not listed by the ASPCA as explicitly non-toxic; treat as mildly toxic as a precaution.

What size pot to step munby's rock rose up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Munby's Rock Rose 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 munby's rock rose

Spring or summer, while munby's rock rose 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 munby's rock rose

Repot dry. Do not water munby's rock rose 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 poor, dry, alkaline, sharply drained 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 munby's rock rose 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 munby's rock rose 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 munby's rock rose

Munby's Rock Rose wants poor, dry, alkaline, sharply drained. Native to alkaline coastal scrub; thrives in gritty, sandy, or rocky soils with a pH of 7.0–8.0 and will struggle in acid or heavy clay. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting munby's rock rose — frequently asked questions

How often should you repot munby's rock rose?

Every 2–3 years, into bone-dry mix for munby's rock rose. Repot munby's rock rose every 2–3 years into a snug pot of poor, dry, alkaline, sharply drained, 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 munby's rock rose need?

When is the best time of year to repot munby's rock rose?

Should you water munby's rock rose after repotting?

No — not straight away. Repot munby's rock rose 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 munby's rock rose after repotting?

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