Mature size & growth rate

How big does Lupin 'The Governor' (Lupinus polyphyllus) get?

Also called Lupin, Lupine, Garden Lupin.

More about lupin 'the governor'

About Lupin 'The Governor'

Lupinus polyphyllus · also called Lupin, Lupine · flowering

A classic cottage-garden perennial producing tall, fragrant spikes of bicoloured blue-and-white flowers in early summer above handsome palmate foliage. 'The Governor' is a Russell hybrid with outstanding vigour and colour. All parts of lupins are moderately toxic to dogs, cats, and horses due to quinolizidine alkaloids.

Mature size: 90-120 cm tall in flower, 60-75 cm spread

Watch for — Lupin aphid (Macrosiphum albifrons): Large grey-green aphids cluster on flower spikes and new growth; treat promptly with insecticidal soap or a systemic insecticide as infestations can be severe.

Indoor size vs how big it gets in the wild

Lupin 'The Governor' stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward. Indoors and in a pot, expect 90-120 cm tall in flower, 60-75 cm spread. 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.

Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Growth rate and years to mature

Lupin 'The Governor' 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 are nitrogen-fixers and rarely need nitrogen fertiliser. apply a potassium-rich fertiliser (e.g., tomato feed) in early spring to promote strong flowering. over-feeding with nitrogen produces excessive leafy growth.

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

How to keep lupin 'the governor' smaller

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

Divide the clump every year or two — splitting lupin 'the governor' is the main way to control its spread and refresh it.
Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump.
Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

The keep-it-smaller method, step by step

Lift the whole plant. Slide lupin 'the governor' out of its pot in spring when the clump has filled it.
Split the clump. Tease or cut the rootball into two or more sections, each with healthy roots and growth.
Repot one division. Put a single division back in the original pot to reset it to a smaller size; pot or give away the rest.
Remove offsets as they form. Through the year, detach new runners or pups to stop it spreading again.

How to grow lupin 'the governor' bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for lupin 'the governor' the accelerators are:

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Good light plus regular feeding maximises offset and runner production.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

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

When lupin 'the governor' outgrows the room (or the pot)

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

The clump bulging over the pot rim or splitting the pot — the cue to divide, not to find a bigger room.
A dense centre that goes bare or tired while the edges keep spreading.
Runners or offsets escaping across the shelf or into neighbouring pots.

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

Lupin 'The Governor' size — frequently asked questions

How big does lupin 'the governor' get?

Lupin 'The Governor' reaches 90-120 cm tall in flower, 60-75 cm spread when grown indoors. Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Is lupin 'the governor' slow or fast growing?

Lupin 'The Governor' is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Lupin 'The Governor' stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward.

How long does lupin 'the governor' 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 lupin 'the governor' smaller?

Divide the clump every year or two — splitting lupin 'the governor' is the main way to control its spread and refresh it. Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump. Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

How can I make lupin 'the governor' grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Good light plus regular feeding maximises offset and runner production. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.