Repotting guide

When & how to repot Long-leaved Pelargonium (Pelargonium longifolium)

Also called Long-leaved Pelargonium, Long-leaf Geranium.

More about long-leaved pelargonium

About Long-leaved Pelargonium

Pelargonium longifolium · also called Long-leaved Pelargonium, Long-leaf Geranium · flowering

Pelargonium longifolium is a tuberous geophyte native to the arid and semi-arid zones of South Africa's Western Cape, producing narrow, strap-shaped leaves and pale cream to yellowish flowers marked with dark purple veins. As a summer-dormant bulb-like plant it follows a Mediterranean rhythm — grow in autumn and winter, rest in summer — and demands excellent drainage and minimal water during dormancy. The single most important care fact is to withhold almost all water in summer when the plant is leafless, or the tuber will rot. Toxic to cats, dogs, and horses.

Mature size: 15–30 cm tall in active growth; the tuber enlarges slowly over years

How to tell long-leaved pelargonium needs repotting

Repotting on a calendar is less reliable than reading the plant. For long-leaved pelargonium, 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 long-leaved pelargonium 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 long-leaved pelargonium

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, long-leaved pelargonium is lifted and divided once the clump congests and flowering drops off. Deciduous tuberous geophyte; narrow leaves emerge from a knobbly rootstock in autumn, the plant flowers in late winter to spring, then dies back to the tuber in summer..

What size pot to step long-leaved pelargonium up to

Pot size matters less than depth and spacing here. When you replant long-leaved pelargonium, 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 long-leaved pelargonium

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 long-leaved pelargonium in full growth or flower sets it back badly.

Step-by-step: repotting long-leaved pelargonium

Wait for dormancy. Let long-leaved pelargonium 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 free-draining, gritty, low-nutrient 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 long-leaved pelargonium, 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 long-leaved pelargonium

Long-leaved Pelargonium wants very free-draining, gritty, low-nutrient mix. Blend equal parts loam-based compost and coarse grit or perlite. The tuber must never sit in damp soil; a terracotta pot with drainage holes helps wick away excess moisture. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting long-leaved pelargonium — frequently asked questions

How often should you repot long-leaved pelargonium?

Lift and divide every 3–4 years once clumps congest for long-leaved pelargonium. Long-leaved Pelargonium 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 free-draining, gritty, low-nutrient mix. Crowding, not pot size, is what reduces flowering over time.

What size pot does long-leaved pelargonium need?

When is the best time of year to repot long-leaved pelargonium?

Do you "repot" long-leaved pelargonium, or lift and divide it?

You lift and divide it. Long-leaved Pelargonium 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 long-leaved pelargonium after repotting?

Hold off feeding long-leaved pelargonium 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.