Definition of doom. 1  1 : a law or ordinance especially in Anglo-Saxon England. 2  2a : judgment, decision; especially : a judicial condemnation or sentenceb (1) : judgment 5a (2) : judgment day 1. 3  3a : destiny; especially : unhappy destinyb : death, ruin.
In its native range Exacum affine is an annual or short-lived perennial and is suitable for permanent outdoor cultivation only in humid tropical and subtropical areas. Grown as a pot plant, this plant requires a well-drained, but moist potting mix. Exacum will tolerate good light but not direct sun.
The name 'Osteospermum' is exclusively used for the perennial forms. Both have in common that the flowers close at night. But the annuals or 'Dimorphotheca' are in many aspects very different to 'Osteospermums'. The garden varieties are hybrids of D. aurantiaca.his means they are tender and won't survive cold winters. They usually can cope with mild frosts, but in areas where the temperatures drop below -2 degrees Celsius they'll have problems surviving.This explains why most growers list them as an annual plant, even though they are in reality tender perennials.