Repotting guide

When & how to repot Pelargonium peltatum 'Roi des Balcons Lilas' (Pelargonium peltatum 'Roi des Balcons Lilas')

Also called Balcony lilac geranium, Roi des Balcons ivy pelargonium.

More about pelargonium peltatum 'roi des balcons lilas'

About Pelargonium peltatum 'Roi des Balcons Lilas'

Pelargonium peltatum 'Roi des Balcons Lilas' · also called Balcony lilac geranium, Roi des Balcons ivy pelargonium · flowering

'Roi des Balcons Lilas' is a classic Continental balcony pelargonium — a vigorous ivy-leaved trailer smothered in single lilac-pink flowers all summer. Long stems cascade dramatically from window boxes and railing planters. Heat- and drought-tolerant once established, it needs full sun, free-draining compost, generous feeding and frost-free overwintering.

Mature size: Stems can trail 60-90 cm or more; spreads 30-45 cm wide.

Watch for — Sparse flowering: Shade or excess nitrogen reduces blooms; provide full sun, feed with high potash and deadhead spent flowers regularly.

How to tell pelargonium peltatum 'roi des balcons lilas' needs repotting

Repotting on a calendar is less reliable than reading the plant. For pelargonium peltatum 'roi des balcons lilas', watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for pelargonium peltatum 'roi des balcons lilas') flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 pelargonium peltatum 'roi des balcons lilas'

Only every 2–4 years, when genuinely crowded. Pelargonium peltatum 'Roi des Balcons Lilas' is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Strongly trailing, vigorous ivy-leaved pelargonium with very long cascading stems; ideal for spilling over balcony rails and box edges..

What size pot to step pelargonium peltatum 'roi des balcons lilas' up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Pelargonium peltatum 'Roi des Balcons Lilas' positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping pelargonium peltatum 'roi des balcons lilas' into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 pelargonium peltatum 'roi des balcons lilas'

Early spring, just as new growth restarts, is the ideal window for pelargonium peltatum 'roi des balcons lilas'. 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 pelargonium peltatum 'roi des balcons lilas'

Confirm it actually needs it. Slide pelargonium peltatum 'roi des balcons lilas' out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip pelargonium peltatum 'roi des balcons lilas' out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh free-draining peat-free or loam-based container compost, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

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 pelargonium peltatum 'roi des balcons lilas' 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 pelargonium peltatum 'roi des balcons lilas'

Pelargonium peltatum 'Roi des Balcons Lilas' wants free-draining peat-free or loam-based container compost. A multipurpose mix lightened with perlite suits it; incorporate slow-release feed for long-season baskets. Free-draining containers are essential to prevent rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pelargonium peltatum 'roi des balcons lilas' — frequently asked questions

How often should you repot pelargonium peltatum 'roi des balcons lilas'?

Only every 2–4 years, when genuinely crowded for pelargonium peltatum 'roi des balcons lilas'. Only repot pelargonium peltatum 'roi des balcons lilas' every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using free-draining peat-free or loam-based container compost. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does pelargonium peltatum 'roi des balcons lilas' need?

When is the best time of year to repot pelargonium peltatum 'roi des balcons lilas'?

Does pelargonium peltatum 'roi des balcons lilas' like to be root-bound?

Yes — pelargonium peltatum 'roi des balcons lilas' genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise pelargonium peltatum 'roi des balcons lilas' after repotting?

Not immediately. Wait about 4 weeks after repotting pelargonium peltatum 'roi des balcons lilas'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.