Mature size & growth rate

How big does Anne Thomson Cranesbill (Geranium 'Anne Thomson') get?

Also called Anne Thomson Cranesbill, Anne Thomson Geranium.

More about anne thomson cranesbill

About Anne Thomson Cranesbill

Geranium 'Anne Thomson' · also called Anne Thomson Cranesbill, Anne Thomson Geranium · flowering

Geranium 'Anne Thomson' is a hybrid of G. procurrens and G. psilostemon bred by Alan Bremner of Orkney, closely related to 'Ann Folkard' but selected for improved heat tolerance and a more compact, less-sprawling habit. The bright chartreuse young leaves mature to mid-green, and large magenta-pink flowers with a black eye and dark veins are produced abundantly all summer. The RHS awarded it AGM status in 2005. The most important care fact is to site it in sun with well-drained soil and allow space for the trailing stems. 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: 20–30 cm tall and 60–90 cm wide.

Indoor size vs how big it gets in the wild

Anne Thomson Cranesbill does not get tall — it gets long. Size here is about stem length and how you train or cut it, not how much floor it claims. Indoors and in a pot, expect 20–30 cm tall and 60–90 cm wide.. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

Growth shows up as lengthening stems that trail down or climb up a support; the plant can be kept tiny or grown metres long from the exact same root system.

Growth rate and years to mature

Anne Thomson Cranesbill is a moderate grower. Realistically, expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Its feeding profile backs this up: apply a balanced slow-release fertiliser in spring; avoid high-nitrogen feeds which produce leafy growth at the expense of the long flowering display.

Want this turned into the right next pot at the right moment? The pot size calculator and the anne thomson cranesbill repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast anne thomson cranesbill grows.

How to keep anne thomson cranesbill smaller

You are not stuck with the maximum size. For anne thomson cranesbill specifically, these are the levers, in order of impact:

Trim the longest vines back to the length you want — anne thomson cranesbill takes hard cutting well and bushes out from the cut.
Cut just above a leaf node; each trimmed stem usually branches into two, so pruning makes it fuller, not sparser.
The cuttings root easily in water or mix, so "keeping it smaller" doubles as free new plants.
A trim once or twice a season is usually enough to hold its length.

The keep-it-smaller method, step by step

Decide the length you want. Pick the point each vine of anne thomson cranesbill should stop — you can be aggressive; it regrows readily.
Cut just above a node. Snip about 0.5 cm above a leaf node so the stem branches there instead of dying back.
Root the cuttings. Drop the trimmed pieces in water or mix — they root in 2-4 weeks and can fill the same pot for a bushier look.
Repeat as it runs. Re-trim whenever it overshoots; regular light pruning keeps it both smaller and fuller.

How to grow anne thomson cranesbill bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for anne thomson cranesbill the accelerators are:

Good light plus a moss pole or trellis triggers the longest, fastest, largest-leaved growth.
Give it something to climb — many vines grow far faster and bigger up a support than trailing.
Feed through spring and summer and keep it consistently watered while it is actively running.

Light is almost always the ceiling. The anne thomson cranesbill light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When anne thomson cranesbill outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for anne thomson cranesbill:

Vines pooling on the floor or wrapping past where you want them — purely a trimming cue, not a repot one.
Bare, leggy stems with leaves only at the tips (usually a light problem, not a size one).
A tangled mass that has outrun its support and needs cutting back and re-training.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the anne thomson cranesbill repotting guide. If you want more of this plant instead of a bigger one, the anne thomson cranesbill propagation guide turns prunings into new plants.

Anne Thomson Cranesbill size — frequently asked questions

How big does anne thomson cranesbill get?

Anne Thomson Cranesbill reaches 20–30 cm tall and 60–90 cm wide. when grown indoors. Growth shows up as lengthening stems that trail down or climb up a support; the plant can be kept tiny or grown metres long from the exact same root system.

Is anne thomson cranesbill slow or fast growing?

Anne Thomson Cranesbill is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Anne Thomson Cranesbill does not get tall — it gets long. Size here is about stem length and how you train or cut it, not how much floor it claims.

How long does anne thomson cranesbill take to reach full size?

Roughly three to six years to reach mature indoor size, gaining a steady amount each growing season. Light, pot size and feeding move that timeline more than anything else.

How do I keep anne thomson cranesbill smaller?

Trim the longest vines back to the length you want — anne thomson cranesbill takes hard cutting well and bushes out from the cut. Cut just above a leaf node; each trimmed stem usually branches into two, so pruning makes it fuller, not sparser. The cuttings root easily in water or mix, so "keeping it smaller" doubles as free new plants. A trim once or twice a season is usually enough to hold its length.

How can I make anne thomson cranesbill grow bigger or faster?

Good light plus a moss pole or trellis triggers the longest, fastest, largest-leaved growth. Give it something to climb — many vines grow far faster and bigger up a support than trailing. Feed through spring and summer and keep it consistently watered while it is actively running.