These are a robust and early flowering clematis group that opens the clematis season each year (as they are the first to flower). They can also thrive in shaded locations, which is why we have included one cultivar in our assortment: Clematis alpina / sibirica x macropetala "Blue Bird"-- their lavender blue flowers open completely. For trellises that are 2 to 4 metres high. Currently not available.
(This group consists mainly of Clematis alpina and Cematis macropetala.)
The location can be sunny to shaded, but not near hot south-facing walls. The soil should be fresh, humus-rich, with good drainage. Avoid heavy clay ('loamy') soils. Protection from wind and a shaded trunk base are optional for these clematis. Planting distance: 0.8 to 2.5 metres. >>> Price
Petiole ('stem tendril') climbers. The roots are fine, so be cautious while planting. Clematis atragene are highly frost-resistant and relatively resistant to clematis wilt. They also tolerate dryness to a degree. Growth is moderately vigorous and the moderately dense foliage will last from April to October, with fine leaves. Growth height is approximately 2 to 4 metres. Flowers of the 'Blue Bird' are lavender blue with 4 + 4 petals (see photo above), and the flower is completely opened. The colour fades to steel-blue, flower diameter is 6 to 8 cm, the flowering period is April - May (flowers are frost-hardy), and a second flowering may occur in August or September. The seed heads/capsules are fine, silvery, and ornamental. "Blue Bird" is propagated seedless to preserve the flowers' unique characteristics. Prune (thin out) just after flowering, around late May (pruning method 1).
Choose a closely arranged wire rope trellis (25 - 35 cm grid). Vertical axes should dominate so that the trellis forms 'standing rectangles' instead of squares. See the bottom of the page for a table with suitable trellis shapes. Our 5050 wire rope trellis is a good choice and can be used with steel rods. Easy Kits ("Basic" and "Basic-S") are enough, sometimes the "Mini" or Light designs may be sufficient, but a trellis in the medium range allows for optimal development.