Masses of richly coloured, crimson-magenta, silk-like petals centred around a raised golden boss of stamens appear, as clusters of flowers, from late summer into early autumn.
'Crimson Brocade' is an upright, bushy, deciduous perennial with narrow lance-shaped, dark green leaves and looks stunning planted with Dahlia 'Ambition' or Dahlia 'Karma Pink Corona'.
How to care for Symphyotrichum novi-belgii Crimson Brocade:
Asters prefer moist but well-drained, loamy soil rich in organic matter. If your soil is heavy or clay-based, improve it by incorporating compost or well-rotted manure. Consistent moisture is important, especially during dry spells.
Space the plants about 45-60cm (18-24in) apart to allow room for growth and ensure good air circulation. This is especially important for Symphyotrichum novi-belgii, which can be more prone to mildew in late summer.
Insert twiggy prunings or slender canes early in the season to give support as the plants grow. Taller cultivars may flop without it, especially in exposed areas.
To encourage bushier growth and more flowers, pinch back the stems when the plants are about 15-20cm (6-8in) tall - you can also remove spent flowers to extend the blooming period.
Avoid overhead watering where possible to help prevent mildew. Water at the base of the plant to keep the foliage dry.
Leave the top growth on through winter to protect the crown and provide shelter and food for wildlife. Cut back to ground level in late winter or early spring when new growth appears.
Apply a 5-7cm (2-3in) mulch around the base in spring to help retain moisture and suppress weeds. Keep mulch clear of the crown to prevent rotting.