I intend to over winter my Cosmos atrosanguineus Chocamocha tubers. They have flowered beautifully over summer and as the specimens I bought were not cheap I'd…
Cosmos genus. These are summer and early autumn flowering annuals and tuberous perennials. There are about 25 species. The leaves are variously lobed. The flowers are disc-shaped and bloom in pink, yellow, red and purples.
Annuals or Perennials
S.U.S.A and C.America
They are half hardy to frost tender, and will need a sunny position. It will do best in moist but well drained soil. In mild areas, tubers of half hardy C.atrosanguineus may be over-wintered in ground if protected with a deep mulch.
You can propagate the half-hardy species by basal cuttings in the spring, the annuals by seed in the autumn or spring.
Aphids, slugs and grey mould may be troublesome.
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