Amnesia haze from Royal Queen Seeds is a well maintained plant reaching up to 1.2 metres. It requires hot outdoor climate like in Australia, North Africa and California, however may need to stay in a greenhouse due to its long flower period. Amnesia haze is one of the best yielding cannabis strains, producing 500-600 grams per plant with up to 600 grams per square metre. The only down side with Amnesia haze is the long flower time required of 12 weeks.