As for essential oils that have long shelf lives usually, they are the thicker ones, such as Cedarwood, Sandalwood, Patchouli, Vetiver and a few others. Exception to this thick oil quality will be the essential oil of Rose Otto.
The season for them is generally a short one. Begins in early July and last for 2 to 3 weeks. Black raspberries tend to ripen before most red raspberries varieties expect for the early ripening summer ones.
Raspberry Facts and Picking Tips. Raspberry Facts and Picking Tips. Raspberries can produce an early summer crop or a late summer and Fall crop. In the U.S. Spring / Summer raspberries (called florocanes) typically peak during June in the South, and in July in the North.