Mature size & growth rate

How big does Spear Head (Senecio kleiniiformis) get?

Also called Spear Head, Spearhead Senecio, Reindeer Antlers.

More about spear head

About Spear Head

Senecio kleiniiformis · also called Spear Head, Spearhead Senecio · houseplant

A distinctive South African succulent producing flat, arrowhead- or spear-shaped blue-green leaves on semi-trailing stems. The unusual leaf shape, reminiscent of arrowheads or antlers, makes it a collector's plant. Best in bright indirect to partial direct light with very free-draining soil and infrequent watering. Toxic to pets.

Mature size: 30–45 cm (12–18 in) tall; 25–35 cm (10–14 in) spread

Watch for — Leggy, weak stems: Low light causes stems to elongate and leaves to become smaller and more widely spaced. Move closer to a window or add a grow light. Prune leggy stems to encourage bushier regrowth at the base.

Indoor size vs how big it gets in the wild

Spear Head 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 30–45 cm (12–18 in) tall. In the ground with no restriction it is a completely different plant — 25–35 cm (10–14 in) spread — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

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

Spear Head 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: feed monthly during the growing season (spring and summer) with a balanced liquid fertiliser at half strength. withhold feed entirely in autumn and winter when growth is minimal.

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

How to keep spear head smaller

You are not stuck with the maximum size. For spear head specifically, these are the levers, in order of impact:

Trim the longest vines back to the length you want — spear head 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 spear head 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 spear head bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for spear head 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 spear head light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When spear head outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for spear head:

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 spear head repotting guide. If you want more of this plant instead of a bigger one, the spear head propagation guide turns prunings into new plants.

Spear Head size — frequently asked questions

How big does spear head get?

Spear Head reaches 30–45 cm (12–18 in) tall when grown indoors, and far larger where it grows unrestricted (25–35 cm (10–14 in) spread). 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 spear head slow or fast growing?

Spear Head is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Spear Head 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 spear head 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 spear head smaller?

Trim the longest vines back to the length you want — spear head 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 spear head 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.