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.
Fruit Testers, 2002. VARIETY ESTIMATED PICKING DATE. Clapp Favorite August 20 to September 1. Bennett August 22 to September 3. Bartlett August 25 to September 5. Aurora August 19 to September 9. Rescue August 25 to September 10.