How to plant
When to plant
Plant bare-root lupins in early to mid-spring once the soil is workable and frost risk has passed. In mild climates, planting can also be done in early autumn. Avoid planting in frozen or waterlogged soil.
Where to plant
Choose a sunny or lightly shaded spot with at least 4–6 hours of sunlight per day. Lupins prefer open borders, cottage gardens and pollinator-friendly beds. Avoid very hot, dry locations, as extreme heat can shorten the flowering period.
Preparing the soil
Loosen soil to 25–30 cm deep and mix in compost. Lupins prefer slightly acidic to neutral, well-drained soil. Avoid adding too much fertiliser—overly rich soil encourages leaf growth at the expense of flowers. Improve heavy clay with grit and compost.
Preparing the plants
Rehydrate bare-root plants by soaking the roots in lukewarm water for 20 minutes before planting. Handle gently—lupin roots are fragile and can break easily.
Planting the plants
Dig a hole large enough to spread the roots naturally. Plant so the crown sits level with the soil surface. Space plants 40–50 cm apart to allow ample room for mature flower spikes. Firm the soil gently and water well after planting.
After planting
Keep the soil evenly moist while roots establish. Apply a light mulch around the plant (not touching the crown) to retain moisture and suppress weeds.
During growth
Water regularly during dry spells. Lupins appreciate consistent moisture but dislike sitting in soggy soil. Apply a light compost mulch in spring. Deadhead spent flower spikes to encourage a second flush of blooms. Tall varieties may need light staking in windy sites.
After flowering / end of season
Cut back spent stems after flowering to maintain tidy growth. In autumn, remove dead foliage but leave the crown in place. Mature plants may self-seed; thin seedlings or leave them for a naturalised look.
Extra tips
Lupins fix nitrogen in the soil, benefiting nearby plants. They pair beautifully with roses, delphiniums, foxgloves and ornamental grasses. Avoid moving mature lupins—root disturbance can cause setbacks.
