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.
Raspberries are really popular summer fruits and are very easy to grow. Just a few raspberry plants will reward you with plenty of fruit from midsummer until mid autumn. If you end up with a glut, raspberries also freeze well. Raspberries can be grown in any size garden, you can even grow raspberries in containers.