Repotting guide

When & how to repot Small-Flowered Cranesbill (Geranium pusillum)

Also called Small-Flowered Cranesbill, Small Geranium.

More about small-flowered cranesbill

About Small-Flowered Cranesbill

Geranium pusillum · also called Small-Flowered Cranesbill, Small Geranium · flowering

Geranium pusillum is a slender, softly hairy annual native to Eurasia and now naturalised widely in North America, typically found on arable field margins, roadsides and disturbed ground. It bears very small pale lilac-pink flowers from June to September and is an undemanding plant that thrives in lean, freely draining soils. The most important care point is that it dislikes rich, moist soils — excessive fertility produces leafy growth at the expense of its delicate flowers. True cranesbill Geranium species are not listed as toxic to pets by the ASPCA, and this species is considered non-toxic to cats and dogs.

Mature size: 10–30 cm tall, spreading to 30 cm

Watch for — Poor flowering in rich soils: In fertile or recently manured ground, plants produce abundant foliage but very few flowers. Move to a lean, well-drained spot or avoid amending the soil with compost or fertiliser.

How to tell small-flowered cranesbill needs repotting

Repotting on a calendar is less reliable than reading the plant. For small-flowered cranesbill, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 small-flowered cranesbill

Every 2–3 years, into bone-dry mix. Small-Flowered Cranesbill's growth habit — spreading, softly hairy annual with palmately lobed leaves and slender branching stems; produces diminutive lilac-pink notched petals individually rather than in showy clusters. — sets the pace. Geranium pusillum is a slender, softly hairy annual native to Eurasia and now naturalised widely in North America, typically found on arable field margins, roadsides and disturbed ground. It bears very small pale lilac-pink flowers from June to September and is an undemanding plant that thrives in lean, freely draining soils. The most important care point is that it dislikes rich, moist soils — excessive fertility produces leafy growth at the expense of its delicate flowers. True cranesbill Geranium species are not listed as toxic to pets by the ASPCA, and this species is considered non-toxic to cats and dogs.

What size pot to step small-flowered cranesbill up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Small-Flowered Cranesbill stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 small-flowered cranesbill

Spring or summer, while small-flowered cranesbill is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting small-flowered cranesbill

Repot dry. Do not water small-flowered cranesbill for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty lean, gritty, free-draining loam or sandy soil; neutral to slightly acid (ph 6.5–7.0) ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set small-flowered cranesbill at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep small-flowered cranesbill completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for small-flowered cranesbill

Small-Flowered Cranesbill wants lean, gritty, free-draining loam or sandy soil; neutral to slightly acid (ph 6.5–7.0). Thrives in low-nutrient soils and performs poorly in rich, moisture-retentive borders. Avoid heavy clay; incorporate coarse grit if necessary to improve drainage. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting small-flowered cranesbill — frequently asked questions

How often should you repot small-flowered cranesbill?

Every 2–3 years, into bone-dry mix for small-flowered cranesbill. Repot small-flowered cranesbill every 2–3 years into a snug pot of lean, gritty, free-draining loam or sandy soil; neutral to slightly acid (ph 6.5–7.0), ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does small-flowered cranesbill need?

When is the best time of year to repot small-flowered cranesbill?

Should you water small-flowered cranesbill after repotting?

No — not straight away. Repot small-flowered cranesbill into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise small-flowered cranesbill after repotting?

Not immediately. Wait about 3 weeks after repotting small-flowered 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.