Clematis Montana are one of the best clematis for facade greening and are a group with many cultivars. They are robust, resistant to clematis wilt, grow quickly, and cover large wall areas with their dense foliage. Their flowers are beautiful, even when compared with the clematis hybrids and their large flowers. Sadly, the flowers will all open almost simultaneously, which limits flowering to only three weeks of the year.
("Polish Spirit" is either a clematis viticella or a clematis x jackmannii)
Clematis Montana are stem tendril ('petiole') climbers. Growth vigour is moderate to strong, also with overhanging growth. Foliage lasts from May to October; leaf colour can be very dark for certain varieties. The clematis can grow up to 10 metres in height. The colour of the flowers depends on the cultivar; most of them range from white to dark pinkish-red. The flowering period (in April) is rather short, the seed capsules beautiful and delicate. The wilted leaves don't detach easily. Prune according to "pruning group 1"-- do not cut in winter, but thin out some shoots after the flowering. The species is robust and disease-free, but in large plants, the base tends to defoliate and become bare.
The trellis should be tightly arranged with a 30 to 50 cm grid. If you don't plan on pruning the plant regularly, the grid spaces can be even larger, as the main function of the trellis is to hold the trunk of the plant. See below for the appropriate cable systems. The easy ("Basic" and "Basic-S") designs are strong enough, but the medium design range allows for better development of the plant. If the trellis is high, the heavy / massive design should be considered.