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.
Blackberry Facts and Picking Tips. In the U.S. Blackberries typically peak during June in the South, and in July in the North. Crops are ready at various times of the month depending on which part of the state you are located. In order to produce good local Blackberries, producers depend on ideal spring and early summer weather conditions.