Ceratostigma plumbaginoides aka Blue Leadwood

Ceratostigma plumbaginoides, also known as the hardy blue-flowered leadwort or 蓝雪花, is a low-growing herbaceous perennial native to Western China. It forms a mat of stems with oval leaves that turn red or purple in autumn. This plant grows up to 50 cm tall and broad, producing bright blue flowers in late summer and early autumn. Its Latin specific epithet, plumbaginoides, indicates its resemblance to plants in the Plumbago genus. Ceratostigma plumbaginoides is valued for its late-season color and is grown as an ornamental plant in temperate climates. It can tolerate temperatures as low as -10 °C but prefers a sunny, sheltered position in moist, well-drained soil. However, due to its invasive nature, it is often cultivated in pots or crevices in dry stone walls. This plant has been awarded the Royal Horticultural Society's Award of Garden Merit.