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.
Harvest Time. The year that you plant your blackberries, you will not get a harvest. You have to wait until the second year. Blackberries generally are ready for their first pick between July and August, but some cultivars may be ready sooner than that.