Repotting guide

When & how to repot Dragon Heart Cranesbill (Geranium 'Dragon Heart')

Also called Dragon Heart Cranesbill, Dragon Heart Geranium.

More about dragon heart cranesbill

About Dragon Heart Cranesbill

Geranium 'Dragon Heart' · also called Dragon Heart Cranesbill, Dragon Heart Geranium · flowering

Geranium 'Dragon Heart' (PBR, sold as 'Bremdra') is a G. psilostemon × G. procurrens hybrid bred by Alan Bremner of Orkney, producing a generous abundance of large, 4 cm-wide magenta flowers with a striking black centre and dark veining from June through to September. The spreading, trailing mounds of deeply lobed mid-green foliage are vigorous and easy to grow, and the plant holds the RHS AGM. The most important care fact is to give it adequate space and cut back lightly after the first flush to encourage continued blooming. ASPCA's 'Geranium' toxic listing refers to Pelargonium; true cranesbills are not confirmed non-toxic by ASPCA, so treat with caution around pets.

Mature size: Up to 50 cm tall and 80 cm wide.

Watch for — Geranium sawfly larvae: Greyish-green, spotted larvae create ragged holes in the foliage in late spring and again in late summer; check leaf undersides regularly and remove by hand to protect the display.

How to tell dragon heart cranesbill needs repotting

Repotting on a calendar is less reliable than reading the plant. For dragon heart cranesbill, 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 dragon heart cranesbill) 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 dragon heart cranesbill

Only every 2–4 years, when genuinely crowded. Dragon Heart Cranesbill 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. Vigorous spreading and trailing deciduous perennial forming a loose scrambling mound; may need support to prevent flopping..

What size pot to step dragon heart cranesbill up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Dragon Heart Cranesbill 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 dragon heart cranesbill 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 dragon heart cranesbill

Early spring, just as new growth restarts, is the ideal window for dragon heart cranesbill. 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 dragon heart cranesbill

Confirm it actually needs it. Slide dragon heart cranesbill 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 dragon heart cranesbill 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 any moderately fertile, well-drained, 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 dragon heart cranesbill 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 dragon heart cranesbill

Dragon Heart Cranesbill wants any moderately fertile, well-drained. Grows in most garden soils apart from waterlogged sites; the spreading habit benefits from an organic mulch in spring to suppress weeds and retain 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 dragon heart cranesbill — frequently asked questions

How often should you repot dragon heart cranesbill?

Only every 2–4 years, when genuinely crowded for dragon heart cranesbill. Only repot dragon heart cranesbill 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 any moderately fertile, well-drained. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does dragon heart cranesbill need?

When is the best time of year to repot dragon heart cranesbill?

Does dragon heart cranesbill like to be root-bound?

Yes — dragon heart cranesbill 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 dragon heart cranesbill after repotting?

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