Repotting guide

When & how to repot Dilys Cranesbill (Geranium 'Dilys')

Also called Dilys Cranesbill, Hardy Geranium 'Dilys'.

More about dilys cranesbill

About Dilys Cranesbill

Geranium 'Dilys' · also called Dilys Cranesbill, Hardy Geranium 'Dilys' · flowering

Geranium 'Dilys' is a low-growing, spreading cranesbill hybrid (G. sanguineum × G. procurrens), introduced by Axle Tree Nursery, bearing single deep reddish-purple flowers with darker veins from midsummer through to autumn — one of the longest-blooming hardy geraniums available. It spreads as a weed-suppressing ground cover to about 50 cm and tolerates partial shade, poor drainage, and dry spells better than most cranesbills. The single most important care point is removing spent stems to keep the plant tidy and encourage continuous flowering. True cranesbill Geranium species are not listed as toxic by the ASPCA, which reserves that classification for Pelargonium, and are widely considered pet-safe.

Mature size: 20-30 cm tall by 40-60 cm wide.

How to tell dilys cranesbill needs repotting

Repotting on a calendar is less reliable than reading the plant. For dilys 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 dilys 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 dilys cranesbill

Only every 2–4 years, when genuinely crowded. Dilys 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. Low-growing, spreading, herbaceous perennial forming a dense weed-suppressing mat..

What size pot to step dilys cranesbill up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Dilys 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 dilys 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 dilys cranesbill

Early spring, just as new growth restarts, is the ideal window for dilys 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 dilys cranesbill

Confirm it actually needs it. Slide dilys 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 dilys 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 moderately fertile, moist to 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 dilys 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 dilys cranesbill

Dilys Cranesbill wants moderately fertile, moist to well-drained. Grows in chalk, clay, loam, or sand; one of the few cranesbills that copes with poorly drained soils without dying back prematurely — still avoid prolonged waterlogging at the crown. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting dilys cranesbill — frequently asked questions

How often should you repot dilys cranesbill?

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

What size pot does dilys cranesbill need?

When is the best time of year to repot dilys cranesbill?

Does dilys cranesbill like to be root-bound?

Yes — dilys 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 dilys cranesbill after repotting?

Not immediately. Wait about 4 weeks after repotting dilys 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.