Mature size & growth rate

How big does The Governor lupine (Lupinus x regalis 'The Governor') get?

Also called The Governor lupine, The Governor lupin, Russell lupin 'The Governor'.

More about the governor lupine

About The Governor lupine

Lupinus x regalis 'The Governor' · also called The Governor lupine, The Governor lupin · flowering

The Governor is a classic Russell lupin hybrid bearing bold two-toned spikes of navy-blue and white flowers on stout stems in early summer. It is a cottage-garden stalwart, excellent for cutting, attracting bumblebees, and fixing atmospheric nitrogen. Like all lupins, it is toxic to pets and humans if ingested.

Mature size: 90–120 cm tall, 60 cm wide

Watch for — Lupin aphid (Macrosiphum albifrons): Large grey-green aphids can colonise flower stems and young shoots in enormous numbers in late spring, causing distorted growth and sticky honeydew. Spray with insecticidal soap or neem oil; large infestations may require systemic treatment. Ladybirds and parasitic wasps provide natural control.

Indoor size vs how big it gets in the wild

The Governor lupine grows on a tree's timeline and scale — indoors it becomes a tall, trunked statement plant rather than a tabletop one. Indoors and in a pot, expect 90–120 cm tall, 60 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.

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

The Governor lupine 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: lupins fix their own atmospheric nitrogen via root nodules and need little nitrogen fertiliser — adding high-nitrogen feeds encourages leafy growth at the expense of flowers. in poor soils, apply a low-nitrogen, potassium-rich fertiliser (e.g. sulphate of potash) in early spring. top-dress with well-rotted compost in autumn rather than heavy feeding.

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

How to keep the governor lupine smaller

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

The decisive tool is the secateurs: the governor lupine 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 the governor lupine 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 the governor lupine bigger or faster

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

When the governor lupine outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for the governor lupine:

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

The Governor lupine size — frequently asked questions

How big does the governor lupine get?

The Governor lupine reaches 90–120 cm tall, 60 cm wide when grown indoors. 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 the governor lupine slow or fast growing?

The Governor lupine is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. The Governor lupine grows on a tree's timeline and scale — indoors it becomes a tall, trunked statement plant rather than a tabletop one.

How long does the governor lupine 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 the governor lupine smaller?

The decisive tool is the secateurs: the governor lupine 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 the governor lupine 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.