Growli
Let's go

Plant care

Lupin 'The Governor' (Lupin) care

Lupinus polyphyllus

Also called Lupin, Lupine, Garden Lupin.

RHS H6USDA 4-8Toxic to petsIndoor 90-120 cm tall in flower

Watering rhythm

7-10days

When the top 3-4 cm of soil is dry, roughly every 7-10 days

Jump to schedule→Get smart reminders in the app

Light

Direct sun (at least 4-6 hours)

Soil

Free-draining, slightly acidic to neutral loam or sandy loam

Humidity

40-60%

Temp

-15-25°C

Pet safety

Toxic to pets

Mature size

90-120 cm tall in flower

Care at a glance

Light

Lupin 'The Governor' needs sun on the leaves, not just bright ambient room light. Full sun (6+ hours) gives the best flowering and compact habit. Lupins will tolerate very light partial shade but flower spikes become smaller and plants less robust in reduced light. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water lupin 'the governor' when the top 3-4 cm of soil is dry, roughly every 7-10 days. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Water regularly during dry spells, especially when plants are in active growth and bud. Avoid waterlogging; lupins are susceptible to crown rot in poorly draining soils. Reduce watering after flowering.

Soil and pot

Lupin 'The Governor' grows best in free-draining, slightly acidic to neutral loam or sandy loam. Lupins fix atmospheric nitrogen via root nodules and prefer slightly acidic soils (pH 5.5-6.5). Avoid lime-rich, chalky soils. Do not over-enrich the soil — lean, free-draining conditions produce the best flowers. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Lupin 'The Governor' sits happiest at around 40-60% humidity and -15-25°C (5-77°F). Average humidity is suitable. Good air circulation reduces the risk of powdery mildew and lupin aphid infestations. Avoid growing in low, damp, frost-pocket positions. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed lupin 'the governor' sparingly. 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. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on lupin 'the governor' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • 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.
  • Powdery mildew — Especially prevalent in warm, dry summers; remove affected foliage and ensure good air circulation.
  • Crown and root rot — Caused by wet, poorly draining soils; improve drainage or raise beds and avoid overwatering.
  • Short lifespan — Russell hybrids are often short-lived (3-5 years); take basal cuttings in spring or raise from seed annually to replace ageing plants.
  • Slug damage — Young shoots and seedlings are very vulnerable; protect in spring with organic slug pellets or nematodes.

Companion plants

Lupin 'The Governor' pairs well with Allium hollandicum, Geranium magnificum, Iris germanica, and Aquilegia. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Take basal cuttings with a heel of root material in early spring, rooting in gritty compost in a cold frame. Seed can be sown direct in autumn or under glass in late winter after soaking for 24 hours (lupin seed coat is very hard). Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Lupin 'The Governor' is toxic to pets. The ASPCA lists Lupinus (lupins/lupines) as toxic to dogs, cats, and horses; seeds and leaves contain quinolizidine alkaloids that cause drooling, vomiting, diarrhoea, loss of coordination, and in severe cases respiratory depression. Seek veterinary attention immediately if ingestion is suspected. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Lupin 'The Governor' care — frequently asked questions

What is the common name for Lupinus polyphyllus?

Lupinus polyphyllus is most commonly called Lupin 'The Governor', but it is also known as Lupin, Lupine, Garden Lupin. The names refer to the same species, so care instructions for Lupin 'The Governor' apply identically to anything sold as Lupin.

How much light does lupin 'the governor' need?

Lupin 'The Governor' grows best in direct sun (at least 4-6 hours). Full sun (6+ hours) gives the best flowering and compact habit. Lupins will tolerate very light partial shade but flower spikes become smaller and plants less robust in reduced light.

How often should I water lupin 'the governor'?

Water lupin 'the governor' when the top 3-4 cm of soil is dry, roughly every 7-10 days. Water regularly during dry spells, especially when plants are in active growth and bud. Avoid waterlogging; lupins are susceptible to crown rot in poorly draining soils. Reduce watering after flowering. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is lupin 'the governor' toxic to cats and dogs?

Lupin 'The Governor' is toxic to pets. The ASPCA lists Lupinus (lupins/lupines) as toxic to dogs, cats, and horses; seeds and leaves contain quinolizidine alkaloids that cause drooling, vomiting, diarrhoea, loss of coordination, and in severe cases respiratory depression. Seek veterinary attention immediately if ingestion is suspected.

What USDA hardiness zone does lupin 'the governor' grow in?

Lupin 'The Governor' is rated for USDA zone 4-8 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Lupin 'The Governor' deep-dive guides

Every aspect of lupin 'the governor' care, each with its own calibrated guide:

Featured in these plant shortlists

Lupin 'The Governor' qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Lupin 'The Governor' is also known as Lupin, Lupine, and Garden Lupin.