Repotting guide

When & how to repot Cut-Leaved Cranesbill (Geranium dissectum)

Also called Cut-Leaved Cranesbill, Cutleaf Geranium.

More about cut-leaved cranesbill

About Cut-Leaved Cranesbill

Geranium dissectum · also called Cut-Leaved Cranesbill, Cutleaf Geranium · flowering

Geranium dissectum is a softly hairy annual native to Europe and western Asia, widely naturalised in North America and Australasia, growing in arable fields, roadsides, disturbed ground and open grassy places. It bears small, notched, deep pink to purplish-red flowers from May to August above very finely dissected, almost feathery foliage that provides a distinctive texture. It requires full sun and a moderately fertile, moist but free-draining soil to grow well. 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: 20–60 cm tall, spreading to 40 cm

How to tell cut-leaved cranesbill needs repotting

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

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot cut-leaved cranesbill on before it becomes hard root-bound.

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 cut-leaved cranesbill

Pot on seedlings as they grow; not a perennial repot. Cut-Leaved Cranesbillis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Ascending to sprawling, softly hairy annual with deeply and finely cut (dissectum) palmate leaves; branching stems reach up to 60 cm under favourable conditions..

What size pot to step cut-leaved cranesbill up to

Pot cut-leaved cranesbill on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

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 cut-leaved cranesbill

Pot cut-leaved cranesbill on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting cut-leaved cranesbill

Pot on before it is root-bound. Check cut-leaved cranesbill regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
Pot into rich mix. Set it into fresh moderately fertile loam, sandy loam or clay loam; mildly acid to alkaline ph at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water cut-leaved cranesbill in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for cut-leaved cranesbill

Cut-Leaved Cranesbill wants moderately fertile loam, sandy loam or clay loam; mildly acid to alkaline ph. Adaptable to a wide range of soil textures including sandy, loamy and clay soils. Performs best with adequate soil moisture retention; very dry, infertile soils reduce vigour and flower production. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting cut-leaved cranesbill — frequently asked questions

How often should you repot cut-leaved cranesbill?

Pot on seedlings as they grow; not a perennial repot for cut-leaved cranesbill. Cut-Leaved Cranesbill is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into moderately fertile loam, sandy loam or clay loam; mildly acid to alkaline ph so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does cut-leaved cranesbill need?

When is the best time of year to repot cut-leaved cranesbill?

Can you put cut-leaved cranesbill straight into a much bigger pot?

No. Even a fast-growing cut-leaved cranesbill should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise cut-leaved cranesbill after repotting?

Not immediately. Wait about 1 week after repotting cut-leaved 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.