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.
The four types of raspberries commonly grown in home gardens include black, purple, summer-bearing red, and fall-bearing red. There are also several yellow raspberry varieties (cultivars). Raspberries are adaptable to a wide range of soil types.