Mature size & growth rate

How big does Old Father Live Forever (Pelargonium cotyledonis) get?

Also called Old Father Live Forever, St Helena Geranium.

More about old father live forever

About Old Father Live Forever

Pelargonium cotyledonis · also called Old Father Live Forever, St Helena Geranium · flowering

Pelargonium cotyledonis is a remarkable succulent-stemmed species endemic to the island of St Helena in the South Atlantic, making it one of the few pelargoniums native outside continental Africa. It forms a thick, pale, water-storing stem topped with large, rounded, slightly hairy leaves and produces clusters of small white flowers. Its unique island origin means it tolerates slightly more moisture and cooler summers than Cape species, but still demands excellent drainage and a frost-free minimum. Toxic to cats, dogs, and horses.

Mature size: 30–60 cm tall in cultivation; can be larger in ideal outdoor conditions

Watch for — Leaf drop in winter: Normal semi-deciduous behaviour in cool, low-light conditions; do not be alarmed by moderate leaf loss if growth otherwise appears healthy. Reduce watering and wait for spring recovery.

Indoor size vs how big it gets in the wild

Old Father Live Forever is a tree at heart. Indoors a pot and your ceiling keep it to 30–60 cm tall in cultivation, but in the ground it is a different scale of plant entirely (can be larger in ideal outdoor conditions). Indoors and in a pot, expect 30–60 cm tall in cultivation. In the ground with no restriction it is a completely different plant — can be larger in ideal outdoor conditions — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Growth rate and years to mature

Old Father Live Forever 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 dilute, half-strength balanced or low-nitrogen fertiliser monthly in spring and summer only; over-feeding produces lush, disease-prone growth at the expense of the plant's compact, succulent character.

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

How to keep old father live forever smaller

You are not stuck with the maximum size. For old father live forever specifically, these are the levers, in order of impact:

The decisive tool is the secateurs: old father live forever can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape.
Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size.
Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height.
Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

The keep-it-smaller method, step by step

Pick the new height. Decide how tall you want old father live forever and find a leaf node or branch point just below that.
Top the main stem. Cut the main growing tip cleanly just above that node in spring; this permanently caps the height and forces side branches.
Keep the pot snug. Avoid jumping to a much bigger pot — a slightly restricted rootball keeps the whole plant smaller.
Maintain the shape. Prune back the tallest new leaders each spring to hold it at the height you chose.

How to grow old father live forever bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for old father live forever the accelerators are:

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators.
Pot up a size every year or two while young; restricted roots are the main thing holding height back.
Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.

Light is almost always the ceiling. The old father live forever light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When old father live forever outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for old father live forever:

The top leaves pressing against or bent by the ceiling — the classic "this is now too tall indoors" sign.
It has to be moved away from a light source it has literally outgrown.
Roots filling the largest pot you can reasonably keep indoors — at that point it is top-or-prune or move it outside (if hardy).

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

Old Father Live Forever size — frequently asked questions

How big does old father live forever get?

Old Father Live Forever reaches 30–60 cm tall in cultivation when grown indoors, and far larger where it grows unrestricted (can be larger in ideal outdoor conditions). It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Is old father live forever slow or fast growing?

Old Father Live Forever is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Old Father Live Forever is a tree at heart. Indoors a pot and your ceiling keep it to 30–60 cm tall in cultivation, but in the ground it is a different scale of plant entirely (can be larger in ideal outdoor conditions).

How long does old father live forever 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 old father live forever smaller?

The decisive tool is the secateurs: old father live forever can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape. Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size. Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height. Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

How can I make old father live forever grow bigger or faster?

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators. Pot up a size every year or two while young; restricted roots are the main thing holding height back. Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.