Repotting guide

When & how to repot Rose Geranium (Pelargonium graveolens)

Also called Rose Geranium, Rose-scented Pelargonium, Sweet-scented Geranium.

More about rose geranium

About Rose Geranium

Pelargonium graveolens · also called Rose Geranium, Rose-scented Pelargonium · herb

Pelargonium graveolens is a vigorous, shrubby scented-leaf pelargonium from the Cape region of South Africa, grown principally for its intensely rose-lemon fragrant, deeply lobed leaves, which are used in perfumery, aromatherapy, and cooking. It produces small pale pink flowers with darker markings but the foliage is the main attraction. It wants full sun, free-draining compost, and a frost-free winter rest; in the UK and cool US climates it performs best as a patio container plant brought indoors before the first frost. Toxic to cats and dogs.

Mature size: 60-120 cm tall and 50-90 cm wide in containers; larger in warm outdoor beds

How to tell rose geranium needs repotting

Repotting on a calendar is less reliable than reading the plant. For rose geranium, watch for these signs:

A dense root mass with little soil visible when you ease rose geranium out of its pot — check once a year rather than assuming.
Roots emerging from the drainage holes (slow on this plant, so this is a strong signal).
The plant has become top-heavy and tips its pot over.
Genuinely stalled growth across a full season despite adequate light — not just the naturally slow pace this plant always has.

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 rose geranium

Every 2–4 years — it is in no hurry. Rose Geranium's growth habit — vigorous, upright to spreading, semi-woody evergreen shrubby perennial that becomes quite large and open with age; pinch back growing tips regularly to keep it bushy and well-clothed. — sets the pace. Pelargonium graveolens is a vigorous, shrubby scented-leaf pelargonium from the Cape region of South Africa, grown principally for its intensely rose-lemon fragrant, deeply lobed leaves, which are used in perfumery, aromatherapy, and cooking. It produces small pale pink flowers with darker markings but the foliage is the main attraction. It wants full sun, free-draining compost, and a frost-free winter rest; in the UK and cool US climates it performs best as a patio container plant brought indoors before the first frost. Toxic to cats and dogs.

What size pot to step rose geranium up to

Step up just one pot size, and only when the roots are genuinely packed. Because rose geranium grows so slowly, a big pot of damp soil will simply sit wet for months around a small root system and invite rot. A snug pot suits this plant; resist the urge to "give it room to grow" — it will not use it.

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 rose geranium

Early spring, just as new growth restarts, is the ideal window for rose geranium. 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 rose geranium

Time it for spring. Repot rose geranium in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip rose geranium out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh well-draining loam-based compost with added grit, ph 6.0-7.0 in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

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 rose geranium 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 rose geranium

Rose Geranium wants well-draining loam-based compost with added grit, ph 6.0-7.0. A 50:50 mix of loam-based compost and coarse grit or perlite gives the sharp drainage this species requires. Avoid rich, peat-heavy mixes; lean soil actually improves fragrance by concentrating essential oils. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting rose geranium — frequently asked questions

How often should you repot rose geranium?

Every 2–4 years — it is in no hurry for rose geranium. Repot rose geranium only every 2–4 years — it builds roots slowly and a yearly repot is wasted effort. Move up just one pot size in spring with fresh well-draining loam-based compost with added grit, ph 6.0-7.0. The main error is repotting too often and into too large a pot, which leaves cold wet soil around the roots.

What size pot does rose geranium need?

When is the best time of year to repot rose geranium?

Can you put rose geranium straight into a much bigger pot?

No. Even a fast-growing rose geranium should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise rose geranium after repotting?

Not immediately. Wait about 4 weeks after repotting rose geranium. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.