Incarvillea delavayi Deli Rose - Hardy gloxinia

The seeds of Delavay's Incarvillea 'Deli Rose' can be sown indoors at the end of winter (February-March) or directly in the ground in spring, after the last frosts. For indoor sowing, place the seeds in a mix of light compost and sand, keep the substrate slightly moist, and keep the seedlings at a temperature of around 15-18°C. Germination usually takes between 3 and 4 weeks. Once the young plants have 2 to 3 leaves, transplant them into individual pots before planting them in the ground in spring.

In-ground cultivation:

Delavay's Incarvillea thrives in well-drained, light soil rich in organic matter, and with a sunny to semi-shady exposure. It tolerates slightly acidic to neutral soils (pH 6-7). When planting, make sure the soil is well-drained, adding sand or gravel if necessary, as the plant is sensitive to stagnant moisture, especially in winter. Water moderately during the growing season (spring-summer) and reduce watering in autumn and winter. Mulching the soil in autumn can protect the roots from intense cold.

Pot cultivation:
For pot cultivation, choose a deep container to accommodate its taproot. Use a mix of compost and sand to ensure good drainage. Place the pot in a well-lit area, ideally exposed to morning sun and protected from strong afternoon heat. In a pot, the plant requires more regular watering, but without excess water, and adding diluted liquid fertilizer once a month during the growing season will promote abundant flowering. In winter, reduce watering and place the pot in a sheltered area if temperatures drop below -10°C.