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Helianthus angustifolius
The perennial sunflower may not have as big a flower as its relatives, but it does have masses of them over along period in autumn, and it is a tough perennial.
Helianthus angustifolius can still reach a good height, 2m + depending on conditions, and once the first flowers begin fade you can simply cut it back for a second flush.
Attractive yellow daisy like flowers with dark centres attract bees, which is always a good thing for any garden, and the deep green foliage acts as a good contrast.
How to grow
A sunny position in a humus rich soil is best for this easy care perennial. Cut back to the new buds after the first flowers begin to fade for a second flush. As the foliage begins to die back in winter, simply cut it back to the ground.