When to plant
Plant Incarvillea tubers in mid- to late spring once the soil has warmed and the risk of frost has passed. In mild climates, tubers may also be planted in early autumn. Avoid planting in cold, wet soil.
Where to plant
Choose a sunny or lightly shaded position with shelter from intense midday heat. Incarvillea grows well in borders, gravel gardens, raised beds and rock gardens. Good drainage is essential to prevent tuber rot.
Preparing the soil
Loosen soil to 20–25 cm deep and improve drainage by adding grit or coarse sand. Incarvillea prefers fertile, free-draining soil enriched with compost. Light, sandy soils often need only a small amount of organic matter added.
Preparing the tubers
Inspect tubers and ensure they are firm and healthy. Incarvillea tubers are thick and brittle—handle gently to avoid breakage. Do not soak tubers before planting, as excess moisture can damage them.
Planting the tubers
Plant tubers 8–10 cm deep with the growing point facing upward. Space plants 25–30 cm apart to allow for their spreading foliage. Cover gently and water lightly after planting.
After planting
Keep soil lightly moist while new growth appears, but avoid overwatering. Apply a thin mulch to help retain moisture, keeping mulch clear of the crown.
During growth
Water regularly during dry spells to support flowering. Do not allow soil to stay waterlogged. Apply a light, balanced fertiliser in spring. Remove spent flowers to encourage a tidy appearance and prolong blooming.
After flowering / end of season
Allow foliage to die back naturally after flowering. In colder climates, apply a protective mulch over winter to shield tubers from frost. In very wet winters, consider lifting and storing tubers in a dry, frost-free place.
Extra tips
Incarvillea combines beautifully with salvias, geums and small ornamental grasses. Mark planting spots clearly—tubers emerge later than many perennials. Excellent for gardeners wanting an exotic look with reliable hardiness.
